Fix translation FR (#86)

.gitattributes

@@ -0,0 +1,9 @@
+# Text files have auto line endings
+* text=auto
+
+# Go source files always have LF line endings
+*.go text eol=lf
+
+# Disable next extensions in project "used languages" list
+*.lua linguist-detectable=false
+*.html linguist-detectable=false

.github/CODEOWNERS

@@ -0,0 +1,3 @@
+# @link <https://help.github.com/en/articles/about-code-owners>
+
+* @tarampampam

.github/ISSUE_TEMPLATE/bug-report.yml

@@ -0,0 +1,53 @@
+# Docs: <https://git.io/JR5E4>
+
+name: 🐞 Bug report
+description: File a bug/issue
+labels: ['type:bug']
+assignees: [tarampampam]
+body:
+  - type: checkboxes
+    attributes:
+      label: Is there an existing issue for this?
+      description: Please search to see if an issue already exists for the bug you encountered
+      options:
+        - label: I have searched the existing issues
+          required: true
+        - label: And it has nothing to do with Traefik
+          required: true
+
+  - type: textarea
+    attributes:
+      label: Describe the bug
+      description: A clear and concise description of what the bug is
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Steps to reproduce
+      description: Steps to reproduce the behavior
+      placeholder: |
+        1. Start the container using command ...
+        2. Send an HTTP request using this curl command ...
+        3. See error
+
+  - type: textarea
+    id: configs
+    attributes:
+      label: Configuration files
+      description: Please copy and paste any relevant configuration files. This will be automatically formatted into code (yaml), so no need for backticks.
+      render: yaml
+      placeholder: Traefik, docker-compose, helm, etc.
+
+  - type: textarea
+    id: logs
+    attributes:
+      label: Relevant log output
+      description: Please copy and paste any relevant log output. This will be automatically formatted into code (shell), so no need for backticks.
+      render: shell
+
+  - type: textarea
+    attributes:
+      label: Anything else?
+      description: Links? References? Anything that will give us more context about the issue you are encountering!
+      placeholder: You can attach images or log files by clicking this area to highlight it and then dragging files in

.github/ISSUE_TEMPLATE/config.yml

@@ -0,0 +1,12 @@
+# Docs: <https://git.io/JP3tm>
+
+blank_issues_enabled: false
+
+contact_links:
+  - name: 🗣 Ask a Question, Discuss
+    url: https://github.com/tarampampam/error-pages/discussions
+    about: Feel free to ask anything
+
+  - name: 🌀 I have a question about Traefik..
+    url: https://community.traefik.io/
+    about: In this case - ask in the Traefik community

.github/ISSUE_TEMPLATE/feature-request.yml

@@ -0,0 +1,33 @@
+# Docs: <https://git.io/JR5E4>
+
+name: 💡 Feature request
+description: Suggest an idea for this project
+labels: ['type:feature_request']
+assignees: [tarampampam]
+body:
+  - type: checkboxes
+    attributes:
+      label: Is there an existing issue for this?
+      description: Please search to see if an issue already exists for the bug you encountered
+      options:
+        - label: I have searched the existing issues
+          required: true
+
+  - type: textarea
+    attributes:
+      label: Describe the problem to be solved
+      description: Please present a concise description of the problem to be addressed by this feature request
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Suggest a solution
+      description: A concise description of your preferred solution
+      placeholder: If there are multiple solutions, please present each one separately
+
+  - type: textarea
+    attributes:
+      label: Additional context
+      description: Add any other context about the feature request
+      placeholder: You can attach images or log files by clicking this area to highlight it and then dragging files in

.github/dependabot.yml

@@ -0,0 +1,22 @@
+# Docs: <https://docs.github.com/en/free-pro-team@latest/github/administering-a-repository/customizing-dependency-updates>
+
+version: 2
+
+updates:
+  - package-ecosystem: gomod
+    directory: /
+    schedule: {interval: monthly}
+    reviewers: [tarampampam]
+    assignees: [tarampampam]
+
+  - package-ecosystem: github-actions
+    directory: /
+    schedule: {interval: monthly}
+    reviewers: [tarampampam]
+    assignees: [tarampampam]
+
+  - package-ecosystem: docker
+    directory: /
+    schedule: {interval: monthly}
+    reviewers: [tarampampam]
+    assignees: [tarampampam]

.github/workflows/documentation.yml

@@ -0,0 +1,19 @@
+name: documentation
+
+on:
+  push:
+    branches: [master, main]
+    paths: ['README.md']
+
+jobs:
+  docker-hub-description:
+    name: Docker Hub Description
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: peter-evans/dockerhub-description@v2 # Action page: <https://github.com/peter-evans/dockerhub-description>
+        with:
+          username: ${{ secrets.DOCKER_LOGIN }}
+          password: ${{ secrets.DOCKER_USER_PASSWORD }}
+          repository: tarampampam/error-pages

.github/workflows/release.yml

@@ -5,6 +5,22 @@ on:
     types: [published]
 
 jobs:
+  purge-cdn-cache:
+    name: Purge jsDelivr CDN cache
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: fjogeleit/http-request-action@v1 # Action page: <https://github.com/fjogeleit/http-request-action>
+        with: {method: 'GET', url: 'https://purge.jsdelivr.net/gh/tarampampam/error-pages@2/l10n/l10n.min.js'}
+
+      - uses: fjogeleit/http-request-action@v1
+        with: {method: 'GET', url: 'https://purge.jsdelivr.net/gh/tarampampam/error-pages@2/l10n/l10n.js'}
+
+      - uses: fjogeleit/http-request-action@v1
+        with: {method: 'GET', url: 'https://purge.jsdelivr.net/gh/tarampampam/error-pages@latest/l10n/l10n.min.js'}
+
+      - uses: fjogeleit/http-request-action@v1
+        with: {method: 'GET', url: 'https://purge.jsdelivr.net/gh/tarampampam/error-pages@latest/l10n/l10n.js'}
+
   build:
     name: Build for ${{ matrix.os }} (${{ matrix.arch }})
     runs-on: ubuntu-20.04
@@ -15,9 +31,9 @@ jobs:
         arch: [amd64]  # amd64, 386
     steps:
       - uses: actions/setup-go@v2
-        with: {go-version: 1.17.1}
+        with: {go-version: 1.18.0}
 
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - uses: gacts/github-slug@v1
         id: slug
@@ -46,7 +62,7 @@ jobs:
     name: Build docker image
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - uses: gacts/github-slug@v1
         id: slug

.github/workflows/tests.yml

@@ -13,7 +13,7 @@ jobs: # Docs: <https://git.io/JvxXE>
     name: Gitleaks
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with: {fetch-depth: 0}
 
       - uses: zricethezav/gitleaks-action@v1 # Action page: <https://github.com/zricethezav/gitleaks-action>
@@ -22,22 +22,56 @@ jobs: # Docs: <https://git.io/JvxXE>
     name: Golang-CI (lint)
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
+
+      - uses: actions/setup-go@v2
+        with: {go-version: 1.17} # On v1.18 I had an error "panic: load embedded ruleguard rules: rules/rules.go:13: can't load fmt"
 
       - name: Run linter
-        uses: golangci/golangci-lint-action@v2 # Action page: <https://github.com/golangci/golangci-lint-action>
+        uses: golangci/golangci-lint-action@v3 # Action page: <https://github.com/golangci/golangci-lint-action>
         with:
-          version: v1.42 # without patch version
+          version: v1.44 # without patch version
           only-new-issues: false # show only new issues if it's a pull request
 
+  validate-config-file:
+    name: Validate config file
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: actions/setup-node@v3
+        with: {node-version: '16'}
+
+      - name: Install linter
+        run: npm install -g ajv-cli # Package page: <https://www.npmjs.com/package/ajv-cli>
+
+      - name: Run linter
+        run: ajv validate --all-errors --verbose -s ./schemas/config/1.0.schema.json -d ./error-pages.y*ml
+
+  lint-l10n:
+    name: Lint l10n file(s)
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: actions/setup-node@v3
+        with: {node-version: '16'}
+
+      - name: Install eslint
+        run: npm install -g eslint@v8 # Package page: <https://www.npmjs.com/package/eslint>
+
+      - name: Run linter
+        working-directory: l10n
+        run: eslint ./*.js
+
   go-test:
     name: Unit tests
     runs-on: ubuntu-20.04
     steps:
       - uses: actions/setup-go@v2
-        with: {go-version: 1.17}
+        with: {go-version: 1.18}
 
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with: {fetch-depth: 2} # Fixes codecov error 'Issue detecting commit SHA'
 
       - name: Go modules Cache # Docs: <https://git.io/JfAKn#go---modules>
@@ -68,12 +102,12 @@ jobs: # Docs: <https://git.io/JvxXE>
       matrix:
         os: [linux, darwin] # linux, freebsd, darwin, windows
         arch: [amd64]  # amd64, 386
-    needs: [golangci-lint, go-test]
+    needs: [golangci-lint, go-test, validate-config-file]
     steps:
       - uses: actions/setup-go@v2
-        with: {go-version: 1.17}
+        with: {go-version: 1.18}
 
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - uses: gacts/github-slug@v1
         id: slug
@@ -111,7 +145,7 @@ jobs: # Docs: <https://git.io/JvxXE>
     runs-on: ubuntu-20.04
     needs: [build]
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - uses: actions/download-artifact@v2
         with:
@@ -134,13 +168,18 @@ jobs: # Docs: <https://git.io/JvxXE>
           test -f ./out/shuffle/404.html
           test -f ./out/noise/404.html
           test -f ./out/hacker-terminal/404.html
+          test -f ./out/cats/404.html
+          test -f ./out/lost-in-space/404.html
+          test -f ./out/app-down/404.html
+          test -f ./out/connection/404.html
+          test -f ./out/matrix/404.html
 
   docker-image:
     name: Build docker image
     runs-on: ubuntu-20.04
-    needs: [golangci-lint, go-test]
+    needs: [golangci-lint, go-test, validate-config-file]
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - uses: gacts/github-slug@v1
         id: slug
@@ -166,19 +205,25 @@ jobs: # Docs: <https://git.io/JvxXE>
     runs-on: ubuntu-20.04
     needs: [docker-image]
     steps:
+      - uses: actions/checkout@v3 # is needed for `upload-sarif` action
+
       - uses: actions/download-artifact@v2
         with:
           name: docker-image
           path: .artifact
 
-      - working-directory: .artifact
-        run: docker load < docker-image.tar
-
-      - uses: anchore/scan-action@v3 # action page: <https://github.com/anchore/scan-action>
+      - uses: aquasecurity/trivy-action@0.2.2 # action page: <https://github.com/aquasecurity/trivy-action>
         with:
-          image: app:ci
-          fail-build: true
-          severity-cutoff: low # negligible, low, medium, high or critical
+          input: .artifact/docker-image.tar
+          format: sarif
+          severity: MEDIUM,HIGH,CRITICAL
+          exit-code: 1
+          output: trivy-results.sarif
+
+      - uses: github/codeql-action/upload-sarif@v1
+        if: always()
+        continue-on-error: true
+        with: {sarif_file: trivy-results.sarif}
 
   poke-docker-image:
     name: Run the docker image
@@ -186,6 +231,8 @@ jobs: # Docs: <https://git.io/JvxXE>
     needs: [docker-image]
     timeout-minutes: 2
     steps:
+      - uses: actions/checkout@v3
+
       - uses: actions/download-artifact@v2
         with:
           name: docker-image
@@ -194,16 +241,21 @@ jobs: # Docs: <https://git.io/JvxXE>
       - working-directory: .artifact
         run: docker load < docker-image.tar
 
+      - name: Download hurl
+        env:
+          VERSION: 1.5.0
+        run: curl -SL -o hurl.deb https://github.com/Orange-OpenSource/hurl/releases/download/${VERSION}/hurl_${VERSION}_amd64.deb
+
+      - name: Install hurl
+        run: sudo dpkg -i hurl.deb
+
       - name: Run container with the app
-        run: docker run --rm -d -p "8080:8080/tcp" --name app app:ci
+        run: docker run --rm -d -p "8080:8080/tcp" -e "SHOW_DETAILS=true" -e "PROXY_HTTP_HEADERS=X-Foo,Bar,Baz_blah" --name app app:ci
 
       - name: Wait for container "healthy" state
         run: until [[ "`docker inspect -f {{.State.Health.Status}} app`" == "healthy" ]]; do echo "wait 1 sec.."; sleep 1; done
 
-      - run: curl --fail http://127.0.0.1:8080/500.html
-      - run: curl --fail http://127.0.0.1:8080/400.html
-      - run: curl --fail http://127.0.0.1:8080/health/live
-      - run: test $(curl --write-out %{http_code} --silent --output /dev/null http://127.0.0.1:8080/) -eq 404
+      - run: hurl --color --test --fail-at-end --variable host=127.0.0.1 --variable port=8080 --summary ./test/hurl/*.hurl
 
       - name: Stop the container
         if: always()

.gitignore

@@ -3,7 +3,7 @@
 /.vscode
 
 ## Binaries
-error-pages
+/error-pages
 
 ## Temp dirs & trash
 /temp

.golangci.yml

@@ -5,6 +5,8 @@ run:
   skip-dirs:
     - .github
     - .git
+    - tmp
+    - temp
   modules-download-mode: readonly
   allow-parallel-runners: true
 
@@ -40,7 +42,9 @@ linters: # All available linters list: <https://golangci-lint.run/usage/linters/
   disable-all: true
   enable:
     - asciicheck # Simple linter to check that your code does not contain non-ASCII identifiers
+    - bidichk # Checks for dangerous unicode character sequences
     - bodyclose # Checks whether HTTP response body is closed successfully
+    - contextcheck # check the function whether use a non-inherited context
     - deadcode # Finds unused code
     - depguard # Go linter that checks if package imports are in a list of acceptable packages
     - dogsled # Checks assignments with too many blank identifiers (e.g. x, _, _, _, := f())

CHANGELOG.md

@@ -4,6 +4,177 @@ All notable changes to this package will be documented in this file.
 
 The format is based on [Keep a Changelog][keepachangelog] and this project adheres to [Semantic Versioning][semver].
 
+## v2.12.1
+
+### Fixed
+
+- Fix translation 🇫🇷 [#86]
+
+[#85]:https://github.com/tarampampam/error-pages/pull/86
+
+## v2.12.0
+
+### Changed
+
+- Error pages now translated in 🇫🇷 [#82]
+
+[#82]:https://github.com/tarampampam/error-pages/pull/82
+
+## v2.11.0
+
+### Added
+
+- Template `matrix` [#81]
+
+### Fixed
+
+- Localization mistakes [#81]
+
+[#81]:https://github.com/tarampampam/error-pages/pull/81
+
+## v2.10.1
+
+### Fixed
+
+- Template `shuffle`
+- Localization mistakes
+
+## v2.10.0
+
+### Changed
+
+- Error pages now translated in 🇺🇦 and 🇷🇺 languages [#80]
+
+[#80]:https://github.com/tarampampam/error-pages/pull/80
+
+## v2.9.0
+
+### Added
+
+- Template `connection` [#79]
+
+[#79]:https://github.com/tarampampam/error-pages/pull/79
+
+## v2.8.1
+
+### Fixed
+
+- Dark mode for `app-down` template
+
+### Changed
+
+- The index page for built error pages now supports a dark theme
+
+## v2.8.0
+
+### Added
+
+- Template `app-down` [#74]
+
+### Changed
+
+- Go updated from `1.17.6` up to `1.18.0`
+
+[#74]:https://github.com/tarampampam/error-pages/pull/74
+
+## v2.7.0
+
+### Changed
+
+- Logs includes request/response headers now [#67]
+
+### Added
+
+- Possibility to proxy HTTP headers from the requests to the responses (can be enabled using `--proxy-headers` flag for the `serve` command or environment variable `PROXY_HTTP_HEADERS`, headers list should be comma-separated) [#67]
+- Template `lost-in-space` [#68]
+
+### Fixed
+
+- Template `l7-light` uses the dark colors in the browsers with the preferred dark theme
+
+[#67]:https://github.com/tarampampam/error-pages/pull/67
+[#68]:https://github.com/tarampampam/error-pages/pull/68
+
+## v2.6.0
+
+### Added
+
+- Possibility to change the template to the random once a day using "special" template name `random-daily` (or hourly, using `random-hourly`) [#48]
+
+[#48]:https://github.com/tarampampam/error-pages/issues/48
+
+## v2.5.0
+
+### Changed
+
+- Go updated from `1.17.5` up to `1.17.6`
+
+### Added
+
+- `Host` and `X-Forwarded-For` Header to error pages [#61]
+
+### Fixed
+
+- Performance issue, that affects template rendering. Now templates are cached in memory (for 2 seconds), and it has improved performance by more than 200% [#60]
+
+[#60]:https://github.com/tarampampam/error-pages/pull/60
+[#61]:https://github.com/tarampampam/error-pages/pull/61
+
+## v2.4.0
+
+### Changed
+
+- It is now possible to use [golang-tags of templates](https://pkg.go.dev/text/template) in error page templates and formatted (`json`, `xml`) responses [#49]
+- Health-check route become `/healthz` (instead `/health/live`, previous route marked as deprecated) [#49]
+
+### Added
+
+- The templates contain details block now (can be enabled using `--show-details` flag for the `serve` command or environment variable `SHOW_DETAILS=true`) [#49]
+- Formatted response templates (`json`, `xml`) - the server responds with a formatted response depending on the `Content-Type` (and `X-Format`) request header value [#49]
+- HTTP header `X-Robots-Tag: noindex` for the error pages [#49]
+- Possibility to pass the needed error page code using `X-Code` HTTP header [#49]
+- Possibility to integrate with [ingress-nginx](https://kubernetes.github.io/ingress-nginx/) [#49]
+- Metrics HTTP endpoint `/metrics` in prometheus format [#54]
+
+### Fixed
+
+- Potential race condition (in the `pick.StringsSlice` struct) [#49]
+
+[#54]:https://github.com/tarampampam/error-pages/pull/54
+[#49]:https://github.com/tarampampam/error-pages/pull/49
+
+## v2.3.0
+
+### Added
+
+- Flag `--default-http-code` for the `serve` subcommand (`404` is used by default instead of `200`, environment name `DEFAULT_HTTP_CODE`) [#41]
+
+### Changed
+
+- Go updated from `1.17.1` up to `1.17.5`
+
+[#41]:https://github.com/tarampampam/error-pages/issues/41
+
+## v2.2.0
+
+### Added
+
+- Template `cats` [#31]
+
+[#31]:https://github.com/tarampampam/error-pages/pull/31
+
+## v2.1.0
+
+### Added
+
+- `referer` field in access log records
+- Flag `--default-error-page` for the `serve` subcommand (`404` is used by default, environment name `DEFAULT_ERROR_PAGE`)
+
+### Changed
+
+- The source code has been refactored
+- The index page (`/`) now returns the error page with a code, declared using `--default-error-page` flag (HTTP code 200, when a page code exists)
+
 ## v2.0.0
 
 ### Changed

Dockerfile

@@ -1,7 +1,7 @@
 # syntax=docker/dockerfile:1.2
 
 # Image page: <https://hub.docker.com/_/golang>
-FROM golang:1.17.1-alpine as builder
+FROM golang:1.18.0-alpine as builder
 
 # can be passed with any prefix (like `v1.2.3@GITHASH`), e.g.: `docker build --build-arg "APP_VERSION=v1.2.3@GITHASH" .`
 ARG APP_VERSION="undefined@docker"
@@ -31,6 +31,7 @@ RUN set -x \
     && echo 'appuser:x:10001:' > ./etc/group \
     && mv /src/error-pages ./bin/error-pages \
     && mv /src/templates ./opt/templates \
+    && rm ./opt/templates/*.md \
     && mv /src/error-pages.yml ./opt/error-pages.yml
 
 WORKDIR /tmp/rootfs/opt
@@ -64,12 +65,13 @@ USER appuser:appuser
 WORKDIR /opt
 
 ENV LISTEN_PORT="8080" \
-    TEMPLATE_NAME="ghost"
+    TEMPLATE_NAME="ghost" \
+    DEFAULT_ERROR_PAGE="404" \
+    DEFAULT_HTTP_CODE="404" \
+    SHOW_DETAILS="false"
 
 # Docs: <https://docs.docker.com/engine/reference/builder/#healthcheck>
-HEALTHCHECK --interval=7s --timeout=2s CMD [ \
-    "/bin/error-pages", "healthcheck", "--log-json" \
-]
+HEALTHCHECK --interval=7s --timeout=2s CMD ["/bin/error-pages", "healthcheck", "--log-json"]
 
 ENTRYPOINT ["/bin/error-pages"]
 

Makefile

@@ -9,7 +9,7 @@ DC_RUN_ARGS = --rm --user "$(shell id -u):$(shell id -g)"
 APP_NAME = $(notdir $(CURDIR))
 
 .PHONY : help \
-         image dive build fmt lint gotest test shell \
+         image dive build fmt lint gotest int-test test shell \
          up down restart \
          clean
 .DEFAULT_GOAL : help
@@ -42,7 +42,10 @@ lint: ## Run app linters
 gotest: ## Run app tests
 	docker-compose run $(DC_RUN_ARGS) --no-deps app go test -v -race -timeout 10s ./...
 
-test: lint gotest ## Run app tests and linters
+int-test: ## Run integration tests (docs: https://hurl.dev/docs/man-page.html#options)
+	docker-compose run --rm hurl --color --test --fail-at-end --variable host=web --variable port=8080 --summary ./test/hurl/*.hurl
+
+test: lint gotest int-test ## Run app tests and linters
 
 shell: ## Start shell into container with golang
 	docker-compose run $(DC_RUN_ARGS) app bash

README.md

@@ -1,358 +1,201 @@
 <p align="center">
-  <img src="https://hsto.org/webt/rm/9y/ww/rm9ywwx3gjv9agwkcmllhsuyo7k.png" width="94" alt="" />
+  <a href="https://github.com/tarampampam/error-pages#readme"><img src="https://socialify.git.ci/tarampampam/error-pages/image?description=1&font=Raleway&forks=1&issues=1&logo=https%3A%2F%2Fhsto.org%2Fwebt%2Frm%2F9y%2Fww%2Frm9ywwx3gjv9agwkcmllhsuyo7k.png&owner=1&pulls=1&pattern=Solid&stargazers=1&theme=Dark" alt="banner" width="100%" /></a>
 </p>
 
-# HTTP's error pages
+<p align="center">
+  <a href="#"><img src="https://img.shields.io/github/go-mod/go-version/tarampampam/error-pages?longCache=true&label=&logo=go&logoColor=white&style=flat-square" alt="" /></a>
+  <a href="https://codecov.io/gh/tarampampam/error-pages"><img src="https://img.shields.io/codecov/c/github/tarampampam/error-pages/master.svg?maxAge=30&label=&logo=codecov&logoColor=white&style=flat-square" alt="" /></a>
+  <a href="https://github.com/tarampampam/error-pages/actions"><img src="https://img.shields.io/github/workflow/status/tarampampam/error-pages/tests?maxAge=30&label=tests&logo=github&style=flat-square" alt="" /></a>
+  <a href="https://github.com/tarampampam/error-pages/actions"><img src="https://img.shields.io/github/workflow/status/tarampampam/error-pages/release?maxAge=30&label=release&logo=github&style=flat-square" alt="" /></a>
+  <a href="https://hub.docker.com/r/tarampampam/error-pages"><img src="https://img.shields.io/docker/pulls/tarampampam/error-pages.svg?maxAge=30&label=pulls&logo=docker&logoColor=white&style=flat-square" alt="" /></a>
+  <a href="https://hub.docker.com/r/tarampampam/error-pages"><img src="https://img.shields.io/docker/image-size/tarampampam/error-pages/latest?maxAge=30&label=size&logo=docker&logoColor=white&style=flat-square" alt="" /></a>
+  <a href="https://github.com/tarampampam/error-pages/blob/master/LICENSE"><img src="https://img.shields.io/github/license/tarampampam/error-pages.svg?maxAge=30&style=flat-square" alt="" /></a>
+</p>
 
-[![Release version][badge_release_version]][link_releases]
-![Project language][badge_language]
-[![Build Status][badge_build]][link_build]
-[![Release Status][badge_release]][link_build]
-[![Coverage][badge_coverage]][link_coverage]
-[![Image size][badge_size_latest]][link_docker_hub]
-[![License][badge_license]][link_license]
+<p align="center"><sup>22 feb. 2022 - ⚡ Our Docker image was downloaded <strong>one MILLION times</strong> from the docker hub! ⚡</sup></p>
 
 One day you may want to replace the standard error pages of your HTTP server with something more original and pretty. That's what this repository was created for :) It contains:
 
-- Simple error pages generator, written on Go
-- Single-page error page templates with different designs (located in the [templates](templates) directory)
-- Fast and lightweight HTTP server (written on Go also, with the [FastHTTP][fasthttp] under the hood)
+- Simple error pages generator, written in Go
+- Single-page error page templates with different designs (located in the [templates](https://github.com/tarampampam/error-pages/tree/master/templates) directory)
+- Fast and lightweight HTTP server
 - Already generated error pages (sources can be [found here][preview-sources], the **demonstration** is always accessible [here][preview-demo])
-- Lightweight docker image _(~3.5Mb compressed size)_ with all the things described above
 
-Also, this project can be used for the [**Traefik** error pages customization](https://doc.traefik.io/traefik/middlewares/http/errorpages/).
+## 🔥 Features list
 
-<p align="center">
-  <img src="https://hsto.org/webt/bc/bt/9i/bcbt9i3jyvozequr1e4maz7i2q8.png" alt="" />
-</p>
+- HTTP server written in Go, with the extremely fast [FastHTTP][fasthttp] under the hood
+  - Respects the `Content-Type` HTTP header (and `X-Format`) value and responds with the corresponding format (supported formats are `json` and `xml`)
+  - Writes logs in `json` format
+  - Contains healthcheck endpoint (`/healthz`)
+  - Contains metrics endpoint (`/metrics`) in Prometheus format
+- Lightweight docker image _(~4.6Mb compressed size)_, distroless and uses the unleveled user by default
+- [Go-template](https://pkg.go.dev/text/template) tags are allowed in the templates
+- Ready for integration with [Traefik][traefik] ([error pages customization](https://doc.traefik.io/traefik/middlewares/http/errorpages/)) and [Ingress-nginx][ingress-nginx]
+- Error pages can be [embedded into your own `nginx`][wiki-usage-with-nginx] docker image
+- Fully configurable (take a look at the [configuration file](https://github.com/tarampampam/error-pages/blob/master/error-pages.yml) and [project Wiki][wiki])
+- Distributed using docker image and compiled binary files
+- Localized (🇺🇸, 🇫🇷, 🇺🇦, 🇷🇺) HTML error pages (translation process [described here](https://github.com/tarampampam/error-pages/tree/master/l10n) - other translations are welcome!)
 
-## Installing
+## 🧩 Install
 
-Download the latest binary file for your os/arch from the [releases page][link_releases] or use our docker image:
+Download the latest binary file for your os/arch from the [releases page][releases] or use our docker image:
 
-[![image stats](https://dockeri.co/image/tarampampam/error-pages)][link_docker_hub]
+[![image stats](https://dockeri.co/image/tarampampam/error-pages)][docker-hub-tags]
 
-Registry                               | Image
--------------------------------------- | -----
-[Docker Hub][link_docker_hub]          | `tarampampam/error-pages`
-[GitHub Container Registry][link_ghcr] | `ghcr.io/tarampampam/error-pages`
+| Registry                          | Image                             |
+|-----------------------------------|-----------------------------------|
+| [Docker Hub][docker-hub]          | `tarampampam/error-pages`         |
+| [GitHub Container Registry][ghcr] | `ghcr.io/tarampampam/error-pages` |
 
 > Using the `latest` tag for the docker image is highly discouraged because of possible backward-incompatible changes during **major** upgrades. Please, use tags in `X.Y.Z` format
 
-To watch the docker image content you can use the [dive](https://github.com/wagoodman/dive):
+💣 **Or** you can download **already rendered** error pages pack as a [zip][pages-pack-zip] or [tar.gz][pages-pack-tar-gz] archive.
 
-```bash
-$ docker run --rm -it \
-    -v "/var/run/docker.sock:/var/run/docker.sock:ro" \
-    wagoodman/dive:latest \
-      tarampampam/error-pages:latest
+[pages-pack-zip]:https://github.com/tarampampam/error-pages/zipball/gh-pages/
+[pages-pack-tar-gz]:https://github.com/tarampampam/error-pages/tarball/gh-pages/
+
+## 🛠 Usage
+
+Please, take a look at [our Wiki][wiki] for the common usage stories:
+
+- [HTTP server][wiki-http-server] (routes, formats, flags and environment variables)
+- [Pages generator][wiki-generator] (build your own error page set)
+- [Static error pages][wiki-static-error-pages] (extract generated static error pages from the docker image)
+- [Usage with nginx][wiki-usage-with-nginx] (include our error pages into an image with nginx)
+- [Usage with Traefik and local Docker Compose][wiki-traefik-docker-compose] (it's a good starting point for the tests)
+- [Usage with Traefik and Docker Swarm][wiki-traefik-swarm]
+- [Kubernetes & ingress nginx][wiki-k8s-ingress-nginx]
+
+[wiki]:https://github.com/tarampampam/error-pages/wiki
+[wiki-http-server]:https://github.com/tarampampam/error-pages/wiki/HTTP-server
+[wiki-generator]:https://github.com/tarampampam/error-pages/wiki/Generator
+[wiki-static-error-pages]:https://github.com/tarampampam/error-pages/wiki/Static-error-pages
+[wiki-usage-with-nginx]:https://github.com/tarampampam/error-pages/wiki/Usage-with-nginx
+[wiki-traefik-swarm]:https://github.com/tarampampam/error-pages/wiki/Traefik-(docker-swarm)
+[wiki-traefik-docker-compose]:https://github.com/tarampampam/error-pages/wiki/Traefik-(docker-compose)
+[wiki-k8s-ingress-nginx]:https://github.com/tarampampam/error-pages/wiki/Kubernetes-&-ingress-nginx
+
+## 🦾 Performance
+
+Used hardware:
+
+- Intel® Core™ i7-10510U CPU @ 1.80GHz × 8
+- 16 GiB RAM
+
+```shell
+$ ulimit -aH | grep file
+-f: file size (blocks)              unlimited
+-c: core file size (blocks)         unlimited
+-n: file descriptors                1048576
+-x: file locks                      unlimited
+
+$ docker run --rm -p "8080:8080/tcp" -e "SHOW_DETAILS=true" error-pages:local # in separate terminal
+
+$ wrk --timeout 1s -t12 -c400 -d30s -s ./test/wrk/request.lua http://127.0.0.1:8080/
+Running 30s test @ http://127.0.0.1:8080/
+  12 threads and 400 connections
+  Thread Stats   Avg      Stdev     Max   +/- Stdev
+    Latency    10.84ms    7.89ms 135.91ms   79.36%
+    Req/Sec     3.23k   785.11     6.30k    70.04%
+  1160567 requests in 30.10s, 4.12GB read
+Requests/sec:  38552.04
+Transfer/sec:    140.23MB
 ```
 
 <details>
-  <summary>Dive screenshot</summary>
+  <summary>FS & memory usage stats during the test</summary>
 
   <p align="center">
-  <img src="https://hsto.org/webt/mi/ak/uf/miakufsh2ibxtsa1nomfhyqombi.png" alt="" />
+    <img src="https://hsto.org/webt/ts/w-/lz/tsw-lznvru0ngjneiimkwq7ysyc.png" alt="" />
   </p>
 </details>
 
+## 🪂 Templates
 
-
-## Usage
-
-All of the examples below will use a docker image with the application, but you can also use a binary. By the way, our docker image uses the **unleveled user** by default and **distroless**.
-
-### HTTP server
-
-As mentioned above - our application can be run as an HTTP server. It only needs to specify the path to the configuration file (it does not need statically generated error pages). The server uses [FastHTTP][fasthttp] and stores all necessary data in memory - so it does not use the file system and very fast. Oh yes, the image with the app also contains a configured **healthcheck** and **logs in JSON** format :)
-
-For the HTTP server running execute in your terminal:
-
-```bash
-$ docker run --rm \
-    -p "8080:8080/tcp" \
-    -e "TEMPLATE_NAME=random" \
-    tarampampam/error-pages
-```
-
-And open [`http://127.0.0.1:8080/404.html`](http://127.0.0.1:8080/404.html) in your favorite browser. Error pages are accessible by the following URLs: `http://127.0.0.1:8080/{page_code}.html`.
-
-Environment variable `TEMPLATE_NAME` should be used for the theme switching (supported templates are described below).
-
-> **Cheat**: you can use `random` (to use the randomized theme on server start) or `i-said-random` (to use the randomized template on **each request**)
-
-To see the help run the following command:
-
-```bash
-$ docker run --rm tarampampam/error-pages serve --help
-```
-
-### Generator
-
-Create a config file (`error-pages.yml`) with the following content:
-
-```yaml
-templates:
-  - path: ./foo.html # Template name "foo" (same as file name),
-                     # content located in the file "foo.html"
-  - name: bar # Template name "bar", its content is described below:
-    content: "Error {{ code }}: {{ message }} ({{ description }})"
-
-pages:
-  400:
-    message: Bad Request
-    description: The server did not understand the request
-
-  401:
-    message: Unauthorized
-    description: The requested page needs a username and a password
-```
-
-Template file `foo.html`:
-
-```html
-<html>
-<title>{{ code }}</title>
-<body>
-    <h1>{{ message }}: {{ description }}</h1>
-</body>
-</html>
-```
-
-And run the generator:
-
-```bash
-$ docker run --rm \
-    -v "$(pwd):/opt:rw" \
-    -u "$(id -u):$(id -g)" \
-    tarampampam/error-pages build --config-file ./error-pages.yml ./out
-
-$ tree
-.
-├── error-pages.yml
-├── foo.html
-└── out
-    ├── bar
-    │   ├── 400.html
-    │   └── 401.html
-    └── foo
-        ├── 400.html
-        └── 401.html
-
-3 directories, 6 files
-
-$ cat ./out/foo/400.html
-<html>
-<title>400</title>
-<body>
-    <h1>Bad Request: The server did not understand the request</h1>
-</body>
-</html>
-
-$ cat ./out/bar/400.html
-Error 400: Bad Request (The server did not understand the request)
-```
-
-To see the usage help run the following command:
-
-```bash
-$ docker run --rm tarampampam/error-pages build --help
-```
-
-### Static error pages
-
-You may want to use the generated error pages somewhere else, and you can simply extract them from the docker image to your local directory for this purpose:
-
-```bash
-$ docker create --name error-pages tarampampam/error-pages:2.0.0-rc2
-$ docker cp error-pages:/opt/html ./out
-$ docker rm -f error-pages
-$ ls ./out
-ghost  hacker-terminal  index.html  l7-dark  l7-light  noise  shuffle
-$ tree
-.
-└── out
-    ├── ghost
-    │   ├── 400.html
-    │   ├── ...
-    │   └── 505.html
-    ├── hacker-terminal
-    │   ├── 400.html
-    │   ├── ...
-    │   └── 505.html
-    ├── index.html
-    ├── l7-dark
-    │   ├── 400.html
-    │   ├── ...
-    ...
-```
-
-### Custom error pages for your image with [nginx][link_nginx]
-
-You can build your own docker image with `nginx` and our error pages:
-
-```nginx
-# File `nginx.conf`
-
-server {
-  listen      80;
-  server_name localhost;
-
-  error_page 401 /_error-pages/401.html;
-  error_page 403 /_error-pages/403.html;
-  error_page 404 /_error-pages/404.html;
-  error_page 500 /_error-pages/500.html;
-  error_page 502 /_error-pages/502.html;
-  error_page 503 /_error-pages/503.html;
-
-  location ^~ /_error-pages/ {
-    internal;
-    root /usr/share/nginx/errorpages;
-  }
-
-  location / {
-    root  /usr/share/nginx/html;
-    index index.html index.htm;
-  }
-}
-```
-
-```dockerfile
-# File `Dockerfile`
-
-FROM nginx:1.21-alpine
-
-COPY --chown=nginx \
-     ./nginx.conf /etc/nginx/conf.d/default.conf
-COPY --chown=nginx \
-     --from=tarampampam/error-pages:2.0.0 \
-     /opt/html/ghost /usr/share/nginx/errorpages/_error-pages
-```
-
-```shell
-$ docker build --tag your-nginx:local -f ./Dockerfile .
-```
-
-> More info about `error_page` directive can be [found here](http://nginx.org/en/docs/http/ngx_http_core_module.html#error_page).
-
-## Templates
-
-Name              | Preview
-:---------------: | :-----:
-`ghost`           | [![ghost](https://hsto.org/webt/oj/cl/4k/ojcl4ko_cvusy5xuki6efffzsyo.gif)](https://tarampampam.github.io/error-pages/ghost/404.html)
-`l7-light`        | [![l7-light](https://hsto.org/webt/xc/iq/vt/xciqvty-aoj-rchfarsjhutpjny.png)](https://tarampampam.github.io/error-pages/l7-light/404.html)
-`l7-dark`         | [![l7-dark](https://hsto.org/webt/s1/ih/yr/s1ihyrqs_y-sgraoimfhk6ypney.png)](https://tarampampam.github.io/error-pages/l7-dark/404.html)
-`shuffle`         | [![shuffle](https://hsto.org/webt/7w/rk/3m/7wrk3mrzz3y8qfqwovmuvacu-bs.gif)](https://tarampampam.github.io/error-pages/shuffle/404.html)
-`noise`           | [![noise](https://hsto.org/webt/42/oq/8y/42oq8yok_i-arrafjt6hds_7ahy.gif)](https://tarampampam.github.io/error-pages/noise/404.html)
-`hacker-terminal` | [![hacker-terminal](https://hsto.org/webt/5s/l0/p1/5sl0p1_ud_nalzjzsj5slz6dfda.gif)](https://tarampampam.github.io/error-pages/hacker-terminal/404.html)
+|       Name        |                              Preview                               |
+|:-----------------:|:------------------------------------------------------------------:|
+|      `ghost`      |                [![ghost][ghost-screen]][ghost-link]                |
+|    `l7-light`     |           [![l7-light][l7-light-screen]][l7-light-link]            |
+|     `l7-dark`     |             [![l7-dark][l7-dark-screen]][l7-dark-link]             |
+|     `shuffle`     |             [![shuffle][shuffle-screen]][shuffle-link]             |
+|      `noise`      |                [![noise][noise-screen]][noise-link]                |
+| `hacker-terminal` | [![hacker-terminal][hacker-terminal-screen]][hacker-terminal-link] |
+|      `cats`       |                 [![cats][cats-screen]][cats-link]                  |
+|  `lost-in-space`  |    [![lost-in-space][lost-in-space-screen]][lost-in-space-link]    |
+|    `app-down`     |           [![app-down][app-down-screen]][app-down-link]            |
+|   `connection`    |        [![connection][connection-screen]][connection-link]         |
+|     `matrix`      |              [![matrix][matrix-screen]][matrix-link]               |
 
 > Note: `noise` template highly uses the CPU, be careful
 
-## Custom error pages for [Traefik][link_traefik]
+[ghost-screen]:https://hsto.org/webt/oj/cl/4k/ojcl4ko_cvusy5xuki6efffzsyo.gif
+[ghost-link]:https://tarampampam.github.io/error-pages/ghost/404.html
+[l7-light-screen]:https://hsto.org/webt/hx/ca/mm/hxcammfm7qjmogtvsjxcidgf7c8.png
+[l7-light-link]:https://tarampampam.github.io/error-pages/l7-light/404.html
+[l7-dark-screen]:https://hsto.org/webt/s1/ih/yr/s1ihyrqs_y-sgraoimfhk6ypney.png
+[l7-dark-link]:https://tarampampam.github.io/error-pages/l7-dark/404.html
+[shuffle-screen]:https://hsto.org/webt/7w/rk/3m/7wrk3mrzz3y8qfqwovmuvacu-bs.gif
+[shuffle-link]:https://tarampampam.github.io/error-pages/shuffle/404.html
+[noise-screen]:https://hsto.org/webt/42/oq/8y/42oq8yok_i-arrafjt6hds_7ahy.gif
+[noise-link]:https://tarampampam.github.io/error-pages/noise/404.html
+[hacker-terminal-screen]:https://hsto.org/webt/5s/l0/p1/5sl0p1_ud_nalzjzsj5slz6dfda.gif
+[hacker-terminal-link]:https://tarampampam.github.io/error-pages/hacker-terminal/404.html
+[cats-screen]:https://hsto.org/webt/_g/y-/ke/_gy-keqinz-3867jbw36v37-iwe.jpeg
+[cats-link]:https://tarampampam.github.io/error-pages/cats/404.html
+[lost-in-space-screen]:https://hsto.org/webt/lf/ln/x8/lflnx8fuy4rofxju34ttskijdsu.gif
+[lost-in-space-link]:https://tarampampam.github.io/error-pages/lost-in-space/404.html
+[app-down-screen]:https://habrastorage.org/webt/j2/la/fj/j2lafjvu_xjflzrvhiixobxy_ca.png
+[app-down-link]:https://tarampampam.github.io/error-pages/app-down/404.html
+[connection-screen]:https://hsto.org/webt/x4/ah/jb/x4ahjboo4-arm3bxpaash_sflmw.png
+[connection-link]:https://tarampampam.github.io/error-pages/connection/404.html
+[matrix-screen]:https://hsto.org/webt/ng/tf/oi/ngtfoiolvmq6hf15kimcxmhprhk.gif
+[matrix-link]:https://tarampampam.github.io/error-pages/matrix/404.html
 
-Simple traefik (tested on `v2.5.3`) service configuration for usage in [docker swarm][link_swarm] (**change with your needs**):
+## 🦾 Contributors
 
-```yaml
-version: '3.8'
+I want to say a big thank you to everyone who contributed to this project:
 
-services:
-  error-pages:
-    image: tarampampam/error-pages:2.0.0
-    environment:
-      TEMPLATE_NAME: l7-dark
-    networks:
-      - traefik-public
-    deploy:
-      placement:
-        constraints:
-          - node.role == worker
-      labels:
-        traefik.enable: 'true'
-        traefik.docker.network: traefik-public
-        # use as "fallback" for any non-registered services (with priority below normal)
-        traefik.http.routers.error-pages-router.rule: HostRegexp(`{host:.+}`)
-        traefik.http.routers.error-pages-router.priority: 10
-        # should say that all of your services work on https
-        traefik.http.routers.error-pages-router.tls: 'true'
-        traefik.http.routers.error-pages-router.entrypoints: https
-        traefik.http.routers.error-pages-router.middlewares: error-pages-middleware@docker
-        traefik.http.services.error-pages-service.loadbalancer.server.port: 8080
-        # "errors" middleware settings
-        traefik.http.middlewares.error-pages-middleware.errors.status: 400-599
-        traefik.http.middlewares.error-pages-middleware.errors.service: error-pages-service@docker
-        traefik.http.middlewares.error-pages-middleware.errors.query: /{status}.html
+[![contributors](https://contrib.rocks/image?repo=tarampampam/error-pages)][contributors]
 
-  any-another-http-service:
-    image: nginx:alpine
-    networks:
-      - traefik-public
-    deploy:
-      placement:
-        constraints:
-          - node.role == worker
-      labels:
-        traefik.enable: 'true'
-        traefik.docker.network: traefik-public
-        traefik.http.routers.another-service.rule: Host(`subdomain.example.com`)
-        traefik.http.routers.another-service.tls: 'true'
-        traefik.http.routers.another-service.entrypoints: https
-        # next line is important
-        traefik.http.routers.another-service.middlewares: error-pages-middleware@docker
-        traefik.http.services.another-service.loadbalancer.server.port: 80
+[contributors]:https://github.com/tarampampam/error-pages/graphs/contributors
 
-networks:
-  traefik-public:
-    external: true
-```
+## 📰 Changes log
 
-## Changes log
+[![Release date][badge-release-date]][releases]
+[![Commits since latest release][badge-commits]][commits]
 
-[![Release date][badge_release_date]][link_releases]
-[![Commits since latest release][badge_commits_since_release]][link_commits]
+Changes log can be [found here][changelog].
 
-Changes log can be [found here][link_changes_log].
+## 👾 Support
 
-## Support
+[![Issues][badge-issues]][issues]
+[![Issues][badge-prs]][prs]
 
-[![Issues][badge_issues]][link_issues]
-[![Issues][badge_pulls]][link_pulls]
+If you find any bugs in the project, please [create an issue][new-issue] in the current repository.
 
-If you will find any package errors, please, [make an issue][link_create_issue] in current repository.
+## 📖 License
 
-## License
+This is open-sourced software licensed under the [MIT License][license].
 
-This is open-sourced software licensed under the [MIT License][link_license].
+[badge-release]:https://img.shields.io/github/release/tarampampam/error-pages.svg?maxAge=30
+[badge-release-date]:https://img.shields.io/github/release-date/tarampampam/error-pages.svg?maxAge=180
+[badge-commits]:https://img.shields.io/github/commits-since/tarampampam/error-pages/latest.svg?maxAge=45
+[badge-issues]:https://img.shields.io/github/issues/tarampampam/error-pages.svg?maxAge=45
+[badge-prs]:https://img.shields.io/github/issues-pr/tarampampam/error-pages.svg?maxAge=45
 
-[badge_build]:https://img.shields.io/github/workflow/status/tarampampam/error-pages/tests?maxAge=30&label=tests&logo=github
-[badge_release]:https://img.shields.io/github/workflow/status/tarampampam/error-pages/release?maxAge=30&label=release&logo=github
-[badge_coverage]:https://img.shields.io/codecov/c/github/tarampampam/error-pages/master.svg?maxAge=30
-[badge_release_version]:https://img.shields.io/github/release/tarampampam/error-pages.svg?maxAge=30
-[badge_size_latest]:https://img.shields.io/docker/image-size/tarampampam/error-pages/latest?maxAge=30
-[badge_language]:https://img.shields.io/github/go-mod/go-version/tarampampam/error-pages?longCache=true
-[badge_license]:https://img.shields.io/github/license/tarampampam/error-pages.svg?longCache=true
-[badge_release_date]:https://img.shields.io/github/release-date/tarampampam/error-pages.svg?maxAge=180
-[badge_commits_since_release]:https://img.shields.io/github/commits-since/tarampampam/error-pages/latest.svg?maxAge=45
-[badge_issues]:https://img.shields.io/github/issues/tarampampam/error-pages.svg?maxAge=45
-[badge_pulls]:https://img.shields.io/github/issues-pr/tarampampam/error-pages.svg?maxAge=45
-
-[link_coverage]:https://codecov.io/gh/tarampampam/error-pages
-[link_build]:https://github.com/tarampampam/error-pages/actions
-[link_docker_hub]:https://hub.docker.com/r/tarampampam/error-pages
-[link_docker_tags]:https://hub.docker.com/r/tarampampam/error-pages/tags
-[link_license]:https://github.com/tarampampam/error-pages/blob/master/LICENSE
-[link_releases]:https://github.com/tarampampam/error-pages/releases
-[link_commits]:https://github.com/tarampampam/error-pages/commits
-[link_changes_log]:https://github.com/tarampampam/error-pages/blob/master/CHANGELOG.md
-[link_issues]:https://github.com/tarampampam/error-pages/issues
-[link_create_issue]:https://github.com/tarampampam/error-pages/issues/new/choose
-[link_pulls]:https://github.com/tarampampam/error-pages/pulls
-[link_ghcr]:https://github.com/users/tarampampam/packages/container/package/error-pages
+[docker-hub]:https://hub.docker.com/r/tarampampam/error-pages
+[docker-hub-tags]:https://hub.docker.com/r/tarampampam/error-pages/tags
+[license]:https://github.com/tarampampam/error-pages/blob/master/LICENSE
+[releases]:https://github.com/tarampampam/error-pages/releases
+[commits]:https://github.com/tarampampam/error-pages/commits
+[changelog]:https://github.com/tarampampam/error-pages/blob/master/CHANGELOG.md
+[issues]:https://github.com/tarampampam/error-pages/issues
+[new-issue]:https://github.com/tarampampam/error-pages/issues/new/choose
+[prs]:https://github.com/tarampampam/error-pages/pulls
+[ghcr]:https://github.com/users/tarampampam/packages/container/package/error-pages
 
 [fasthttp]:https://github.com/valyala/fasthttp
 [preview-sources]:https://github.com/tarampampam/error-pages/tree/gh-pages
 [preview-demo]:https://tarampampam.github.io/error-pages/
-
-[link_nginx]:http://nginx.org/
-[link_traefik]:https://docs.traefik.io/
-[link_swarm]:https://docs.docker.com/engine/swarm/
-[link_gh_pages]:https://tarampampam.github.io/error-pages/
+[traefik]:https://github.com/traefik/traefik
+[ingress-nginx]:https://github.com/kubernetes/ingress-nginx/tree/main/charts/ingress-nginx

cmd/error-pages/main_test.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	"os"
+	"testing"
+
+	"github.com/kami-zh/go-capturer"
+	"github.com/stretchr/testify/assert"
+)
+
+func Test_Main(t *testing.T) {
+	os.Args = []string{"", "--help"}
+	exitFn = func(code int) { assert.Equal(t, 0, code) }
+
+	output := capturer.CaptureStdout(main)
+
+	assert.Contains(t, output, "Usage:")
+	assert.Contains(t, output, "Available Commands:")
+	assert.Contains(t, output, "Flags:")
+}
+
+func Test_MainWithoutCommands(t *testing.T) {
+	os.Args = []string{""}
+	exitFn = func(code int) { assert.Equal(t, 0, code) }
+
+	output := capturer.CaptureStdout(main)
+
+	assert.Contains(t, output, "Usage:")
+	assert.Contains(t, output, "Available Commands:")
+	assert.Contains(t, output, "Flags:")
+}
+
+func Test_MainUnknownSubcommand(t *testing.T) {
+	os.Args = []string{"", "foobar"}
+	exitFn = func(code int) { assert.Equal(t, 1, code) }
+
+	output := capturer.CaptureStderr(main)
+
+	assert.Contains(t, output, "unknown command")
+	assert.Contains(t, output, "foobar")
+}

docker-compose.yml

@@ -1,6 +1,6 @@
 # Docker-compose file is used only for local development. This is not production-ready example.
 
-version: '3.4'
+version: '3.8'
 
 volumes:
   tmp-data: {}
@@ -8,7 +8,7 @@ volumes:
 
 services:
   app: &app-service
-    image: golang:1.17.1-buster # Image page: <https://hub.docker.com/_/golang>
+    image: golang:1.18.0-buster # Image page: <https://hub.docker.com/_/golang>
     working_dir: /src
     environment:
       HOME: /tmp
@@ -30,13 +30,15 @@ services:
       - serve
       - --verbose
       - --port=8080
+      - --show-details
+      - --proxy-headers=X-Foo,Bar,Baz_blah
     healthcheck:
-      test: ['CMD', 'wget', '--spider', '-q', 'http://127.0.0.1:8080/health/live']
+      test: ['CMD', 'wget', '--spider', '-q', 'http://127.0.0.1:8080/healthz']
       interval: 5s
       timeout: 2s
 
   golint:
-    image: golangci/golangci-lint:v1.42-alpine # Image page: <https://hub.docker.com/r/golangci/golangci-lint>
+    image: golangci/golangci-lint:v1.44-alpine # Image page: <https://hub.docker.com/r/golangci/golangci-lint>
     environment:
       GOLANGCI_LINT_CACHE: /tmp/golint # <https://github.com/golangci/golangci-lint/blob/v1.42.0/internal/cache/default.go#L68>
     volumes:
@@ -44,3 +46,12 @@ services:
       - golint-cache:/tmp/golint:rw
     working_dir: /src
     command: /bin/true
+
+  hurl:
+    image: orangeopensource/hurl:1.5.0
+    volumes:
+      - .:/src:ro
+    working_dir: /src
+    depends_on:
+      web:
+        condition: service_healthy

error-pages.yml

@@ -10,6 +10,52 @@ templates:
   - path: ./templates/shuffle.html
   - path: ./templates/noise.html
   - path: ./templates/hacker-terminal.html
+  - path: ./templates/cats.html
+  - path: ./templates/lost-in-space.html
+  - path: ./templates/app-down.html
+  - path: ./templates/connection.html
+  - path: ./templates/matrix.html
+
+formats:
+  json:
+    content: |
+      {
+        "error": true,
+        "code": {{ code | json }},
+        "message": {{ message | json }},
+        "description": {{ description | json }}{{ if show_details }},
+        "details": {
+          "host": {{ host | json }},
+          "original_uri": {{ original_uri | json }},
+          "forwarded_for": {{ forwarded_for | json }},
+          "namespace": {{ namespace | json }},
+          "ingress_name": {{ ingress_name | json }},
+          "service_name": {{ service_name | json }},
+          "service_port": {{ service_port | json }},
+          "request_id": {{ request_id | json }},
+          "timestamp": {{ now.Unix }}
+        }{{ end }}
+      }
+
+  xml:
+    content: |
+      <?xml version="1.0" encoding="utf-8"?>
+      <error>
+        <code>{{ code }}</code>
+        <message>{{ message }}</message>
+        <description>{{ description }}</description>{{ if show_details }}
+        <details>
+          <host>{{ host }}</host>
+          <originalURI>{{ original_uri }}</originalURI>
+          <forwardedFor>{{ forwarded_for }}</forwardedFor>
+          <namespace>{{ namespace }}</namespace>
+          <ingressName>{{ ingress_name }}</ingressName>
+          <serviceName>{{ service_name }}</serviceName>
+          <servicePort>{{ service_port }}</servicePort>
+          <requestID>{{ request_id }}</requestID>
+          <timestamp>{{ now.Unix }}</timestamp>
+        </details>{{ end }}
+      </error>
 
 pages:
   400:

go.mod

@@ -1,32 +1,41 @@
 module github.com/tarampampam/error-pages
 
-go 1.17
+go 1.18
 
 require (
-	github.com/a8m/envsubst v1.2.0
-	github.com/fasthttp/router v1.4.3
-	github.com/fatih/color v1.7.0
+	github.com/a8m/envsubst v1.3.0
+	github.com/fasthttp/router v1.4.6
+	github.com/fatih/color v1.13.0
 	github.com/kami-zh/go-capturer v0.0.0-20171211120116-e492ea43421d
-	github.com/pkg/errors v0.8.1
-	github.com/spf13/cobra v1.2.1
+	github.com/pkg/errors v0.9.1
+	github.com/prometheus/client_golang v1.12.1
+	github.com/prometheus/client_model v0.2.0
+	github.com/spf13/cobra v1.4.0
 	github.com/spf13/pflag v1.0.5
-	github.com/stretchr/testify v1.7.0
-	github.com/valyala/fasthttp v1.30.0
-	go.uber.org/zap v1.19.1
+	github.com/stretchr/testify v1.7.1
+	github.com/valyala/fasthttp v1.34.0
+	go.uber.org/zap v1.21.0
 	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b
 )
 
 require (
-	github.com/andybalholm/brotli v1.0.3 // indirect
+	github.com/andybalholm/brotli v1.0.4 // indirect
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.1.2 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
 	github.com/inconshreveable/mousetrap v1.0.0 // indirect
-	github.com/klauspost/compress v1.13.6 // indirect
-	github.com/mattn/go-colorable v0.0.9 // indirect
-	github.com/mattn/go-isatty v0.0.3 // indirect
+	github.com/klauspost/compress v1.15.0 // indirect
+	github.com/mattn/go-colorable v0.1.12 // indirect
+	github.com/mattn/go-isatty v0.0.14 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/savsgio/gotils v0.0.0-20210921075833-21a6215cb0e4 // indirect
+	github.com/prometheus/common v0.32.1 // indirect
+	github.com/prometheus/procfs v0.7.3 // indirect
+	github.com/savsgio/gotils v0.0.0-20211223103454-d0aaa54c5899 // indirect
 	github.com/valyala/bytebufferpool v1.0.0 // indirect
 	go.uber.org/atomic v1.7.0 // indirect
 	go.uber.org/multierr v1.6.0 // indirect
-	golang.org/x/sys v0.0.0-20210514084401-e8d321eab015 // indirect
+	golang.org/x/sys v0.0.0-20220227234510-4e6760a101f9 // indirect
+	google.golang.org/protobuf v1.27.1 // indirect
 )

go.sum

@@ -13,11 +13,6 @@ cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKV
 cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
 cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
 cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY=
-cloud.google.com/go v0.72.0/go.mod h1:M+5Vjvlc2wnp6tjzE102Dw08nGShTscUx2nZMufOKPI=
-cloud.google.com/go v0.74.0/go.mod h1:VV1xSbzvo+9QJOxLDaJfTjx5e+MePCpCWwvftOeQmWk=
-cloud.google.com/go v0.78.0/go.mod h1:QjdrLG0uq+YwhjoVOLsS1t7TW8fs36kLs4XO5R5ECHg=
-cloud.google.com/go v0.79.0/go.mod h1:3bzgcEeQlzbuEAYu4mrWhKqWjmpprinYgKJLgKHnbb8=
-cloud.google.com/go v0.81.0/go.mod h1:mk/AM35KwGk/Nm2YSeZbxXdrNK3KZOYHmLkOqC2V6E0=
 cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
 cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
 cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc=
@@ -26,7 +21,6 @@ cloud.google.com/go/bigquery v1.7.0/go.mod h1://okPTzCYNXSlb24MZs83e2Do+h+VXtc4g
 cloud.google.com/go/bigquery v1.8.0/go.mod h1:J5hqkt3O0uAFnINi6JXValWIb1v0goeZM77hZzJN/fQ=
 cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
 cloud.google.com/go/datastore v1.1.0/go.mod h1:umbIZjpQpHh4hmRpGhH4tLFup+FVzqBi1b3c64qFpCk=
-cloud.google.com/go/firestore v1.1.0/go.mod h1:ulACoGHTpvq5r8rxGJ4ddJZBZqakUQqClKRT5SZwBmk=
 cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
 cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw=
 cloud.google.com/go/pubsub v1.2.0/go.mod h1:jhfEVHT8odbXTkndysNHCcx0awwzvfOlguIAii9o8iA=
@@ -39,51 +33,53 @@ cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
-github.com/a8m/envsubst v1.2.0 h1:yvzAhJD2QKdo35Ut03wIfXQmg+ta3wC/1bskfZynz+Q=
-github.com/a8m/envsubst v1.2.0/go.mod h1:PpvLvNWa+Rvu/10qXmFbFiGICIU5hZvFJNPCCkUaObg=
-github.com/andybalholm/brotli v1.0.2/go.mod h1:loMXtMfwqflxFJPmdbJO0a3KNoPuLBgiu3qAvBg8x/Y=
-github.com/andybalholm/brotli v1.0.3 h1:fpcw+r1N1h0Poc1F/pHbW40cUm/lMEQslZtCkBQ0UnM=
-github.com/andybalholm/brotli v1.0.3/go.mod h1:fO7iG3H7G2nSZ7m0zPUDn85XEX2GTukHGRSepvi9Eig=
-github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY=
-github.com/armon/circbuf v0.0.0-20150827004946-bbbad097214e/go.mod h1:3U/XgcO3hCbHZ8TKRvWD2dDTCfh9M9ya+I9JpbB7O8o=
-github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY=
-github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
+github.com/a8m/envsubst v1.3.0 h1:GmXKmVssap0YtlU3E230W98RWtWCyIZzjtf1apWWyAg=
+github.com/a8m/envsubst v1.3.0/go.mod h1:MVUTQNGQ3tsjOOtKCNd+fl8RzhsXcDvvAEzkhGtlsbY=
+github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
+github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
+github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
+github.com/andybalholm/brotli v1.0.4 h1:V7DdXeJtZscaqfNuAdSRuRFzuiKlHSC/Zh3zl9qY3JY=
+github.com/andybalholm/brotli v1.0.4/go.mod h1:fO7iG3H7G2nSZ7m0zPUDn85XEX2GTukHGRSepvi9Eig=
 github.com/benbjohnson/clock v1.1.0 h1:Q92kusRqC1XV2MjkWETPvjJVqKetz1OzxZB7mHJLju8=
 github.com/benbjohnson/clock v1.1.0/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA=
-github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs=
-github.com/bketelsen/crypt v0.0.4/go.mod h1:aI6NrJ0pMGgvZKL1iVgXLnfIFJtfV+bKCoqOes/6LfM=
+github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
+github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
+github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
+github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
 github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
+github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/cespare/xxhash/v2 v2.1.2 h1:YRXhKfTDauu4ajMg1TPgFO5jnlC2HCbmLXMcTG5cbYE=
+github.com/cespare/xxhash/v2 v2.1.2/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
 github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
 github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
 github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
-github.com/cncf/udpa/go v0.0.0-20200629203442-efcf912fb354/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
-github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
-github.com/coreos/go-semver v0.3.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
-github.com/coreos/go-systemd/v22 v22.3.2/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc=
-github.com/cpuguy83/go-md2man/v2 v2.0.0/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
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@@ -111,9 +106,8 @@ github.com/golang/protobuf v1.4.1/go.mod h1:U8fpvMrcmy5pZrNK1lt4xCsGvpyWQ/VVv6QD
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@@ -303,8 +277,6 @@ golang.org/x/lint v0.0.0-20190930215403-16217165b5de/go.mod h1:6SW0HCj/g11FgYtHl
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@@ -313,13 +285,10 @@ golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzB
 golang.org/x/mod v0.1.1-0.20191107180719-034126e5016b/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
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@@ -327,6 +296,7 @@ golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn
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@@ -344,27 +314,17 @@ golang.org/x/net v0.0.0-20200520182314-0ba52f642ac2/go.mod h1:qpuaurCH72eLCgpAm/
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@@ -373,25 +333,26 @@ golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJ
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 golang.org/x/sys v0.0.0-20200113162924-86b910548bc1/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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@@ -403,32 +364,32 @@ golang.org/x/sys v0.0.0-20200501052902-10377860bb8e/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200511232937-7e40ca221e25/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200515095857-1151b9dac4a9/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/text v0.3.4/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/text v0.3.5/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
 golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
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@@ -438,7 +399,6 @@ golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3
 golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190312151545-0bb0c0a6e846/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190312170243-e65039ee4138/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
-golang.org/x/tools v0.0.0-20190328211700-ab21143f2384/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190425150028-36563e24a262/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
 golang.org/x/tools v0.0.0-20190506145303-2d16b83fe98c/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
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@@ -448,7 +408,6 @@ golang.org/x/tools v0.0.0-20190628153133-6cdbf07be9d0/go.mod h1:/rFqwRUd4F7ZHNgw
 golang.org/x/tools v0.0.0-20190816200558-6889da9d5479/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20190911174233-4f2ddba30aff/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20191012152004-8de300cfc20a/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
-golang.org/x/tools v0.0.0-20191112195655-aa38f8e97acc/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20191113191852-77e3bb0ad9e7/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
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@@ -471,22 +430,14 @@ golang.org/x/tools v0.0.0-20200501065659-ab2804fb9c9d/go.mod h1:EkVYQZoAsY45+roY
 golang.org/x/tools v0.0.0-20200512131952-2bc93b1c0c88/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
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 golang.org/x/tools v0.0.0-20200618134242-20370b0cb4b2/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
-golang.org/x/tools v0.0.0-20200619180055-7c47624df98f/go.mod h1:EkVYQZoAsY45+roYkvgYkIh4xh/qjgUK9TdY2XT94GE=
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 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
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@@ -504,19 +455,12 @@ google.golang.org/api v0.24.0/go.mod h1:lIXQywCXRcnZPGlsd8NbLnOjtAoL6em04bJ9+z0M
 google.golang.org/api v0.28.0/go.mod h1:lIXQywCXRcnZPGlsd8NbLnOjtAoL6em04bJ9+z0MncE=
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 google.golang.org/api v0.30.0/go.mod h1:QGmEvQ87FHZNiUVJkT14jQNYJ4ZJjdRF23ZXz5138Fc=
-google.golang.org/api v0.35.0/go.mod h1:/XrVsuzM0rZmrsbjJutiuftIzeuTQcEeaYcSk/mQ1dg=
-google.golang.org/api v0.36.0/go.mod h1:+z5ficQTmoYpPn8LCUNVpK5I7hwkpjbcgqA7I34qYtE=
-google.golang.org/api v0.40.0/go.mod h1:fYKFpnQN0DsDSKRVRcQSDQNtqWPfM9i+zNPxepjRCQ8=
-google.golang.org/api v0.41.0/go.mod h1:RkxM5lITDfTzmyKFPt+wGrCJbVfniCr2ool8kTBzRTU=
-google.golang.org/api v0.43.0/go.mod h1:nQsDGjRXMo4lvh5hP0TKqF244gqhGcr/YSIykhUk/94=
-google.golang.org/api v0.44.0/go.mod h1:EBOGZqzyhtvMDoxwS97ctnh0zUmYY6CxqXsc1AvkYD8=
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 google.golang.org/appengine v1.6.5/go.mod h1:8WjMMxjGQR8xUklV/ARdw2HLXBOI7O7uCIDZVag1xfc=
 google.golang.org/appengine v1.6.6/go.mod h1:8WjMMxjGQR8xUklV/ARdw2HLXBOI7O7uCIDZVag1xfc=
-google.golang.org/appengine v1.6.7/go.mod h1:8WjMMxjGQR8xUklV/ARdw2HLXBOI7O7uCIDZVag1xfc=
 google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
 google.golang.org/genproto v0.0.0-20190307195333-5fe7a883aa19/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
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@@ -540,24 +484,12 @@ google.golang.org/genproto v0.0.0-20200312145019-da6875a35672/go.mod h1:55QSHmfG
 google.golang.org/genproto v0.0.0-20200331122359-1ee6d9798940/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
 google.golang.org/genproto v0.0.0-20200430143042-b979b6f78d84/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
 google.golang.org/genproto v0.0.0-20200511104702-f5ebc3bea380/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
-google.golang.org/genproto v0.0.0-20200513103714-09dca8ec2884/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
 google.golang.org/genproto v0.0.0-20200515170657-fc4c6c6a6587/go.mod h1:YsZOwe1myG/8QRHRsmBRE1LrgQY60beZKjly0O1fX9U=
 google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013/go.mod h1:NbSheEEYHJ7i3ixzK3sjbqSGDJWnxyFXZblF3eUsNvo=
 google.golang.org/genproto v0.0.0-20200618031413-b414f8b61790/go.mod h1:jDfRM7FcilCzHH/e9qn6dsT145K34l5v+OpcnNgKAAA=
 google.golang.org/genproto v0.0.0-20200729003335-053ba62fc06f/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/genproto v0.0.0-20200804131852-c06518451d9c/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/genproto v0.0.0-20200825200019-8632dd797987/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
-google.golang.org/genproto v0.0.0-20200904004341-0bd0a958aa1d/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
-google.golang.org/genproto v0.0.0-20201109203340-2640f1f9cdfb/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
-google.golang.org/genproto v0.0.0-20201201144952-b05cb90ed32e/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
-google.golang.org/genproto v0.0.0-20201210142538-e3217bee35cc/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
-google.golang.org/genproto v0.0.0-20201214200347-8c77b98c765d/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
-google.golang.org/genproto v0.0.0-20210222152913-aa3ee6e6a81c/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
-google.golang.org/genproto v0.0.0-20210303154014-9728d6b83eeb/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
-google.golang.org/genproto v0.0.0-20210310155132-4ce2db91004e/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
-google.golang.org/genproto v0.0.0-20210319143718-93e7006c17a6/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
-google.golang.org/genproto v0.0.0-20210402141018-6c239bbf2bb1/go.mod h1:9lPAdzaEmUacj36I+k7YKbEc5CXzPIeORRgDAUOu28A=
-google.golang.org/genproto v0.0.0-20210602131652-f16073e35f0c/go.mod h1:UODoCrxHCcBojKKwX1terBiRUaqAsFqJiF615XL43r0=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
 google.golang.org/grpc v1.21.1/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
@@ -570,14 +502,6 @@ google.golang.org/grpc v1.28.0/go.mod h1:rpkK4SK4GF4Ach/+MFLZUBavHOvF2JJB5uozKKa
 google.golang.org/grpc v1.29.1/go.mod h1:itym6AZVZYACWQqET3MqgPpjcuV5QH3BxFS3IjizoKk=
 google.golang.org/grpc v1.30.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
 google.golang.org/grpc v1.31.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
-google.golang.org/grpc v1.31.1/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
-google.golang.org/grpc v1.33.1/go.mod h1:fr5YgcSWrqhRRxogOsw7RzIpsmvOZ6IcH4kBYTpR3n0=
-google.golang.org/grpc v1.33.2/go.mod h1:JMHMWHQWaTccqQQlmk3MJZS+GWXOdAesneDmEnv2fbc=
-google.golang.org/grpc v1.34.0/go.mod h1:WotjhfgOW/POjDeRt8vscBtXq+2VjORFy659qA51WJ8=
-google.golang.org/grpc v1.35.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
-google.golang.org/grpc v1.36.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
-google.golang.org/grpc v1.36.1/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
-google.golang.org/grpc v1.38.0/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
@@ -590,14 +514,20 @@ google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGj
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
 google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
+google.golang.org/protobuf v1.27.1 h1:SnqbnDw1V7RiZcXPx5MEeqPv2s79L9i7BJUlG/+RurQ=
+google.golang.org/protobuf v1.27.1/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
+gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
-gopkg.in/ini.v1 v1.62.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

internal/breaker/os_signal.go

@@ -8,7 +8,7 @@ import (
 	"syscall"
 )
 
-// OSSignals allows to subscribe for system signals.
+// OSSignals allows subscribing for system signals.
 type OSSignals struct {
 	ctx context.Context
 	ch  chan os.Signal
@@ -22,7 +22,7 @@ func NewOSSignals(ctx context.Context) OSSignals {
 	}
 }
 
-// Subscribe for some of system signals (call Stop for stopping).
+// Subscribe for some system signals (call Stop for stopping).
 func (oss *OSSignals) Subscribe(onSignal func(os.Signal), signals ...os.Signal) {
 	if len(signals) == 0 {
 		signals = []os.Signal{os.Interrupt, syscall.SIGINT, syscall.SIGTERM} // default signals

internal/checkers/health.go

@@ -34,7 +34,7 @@ func NewHealthChecker(ctx context.Context, client ...httpClient) *HealthChecker
 
 // Check application using liveness probe.
 func (c *HealthChecker) Check(port uint16) error {
-	req, err := http.NewRequestWithContext(c.ctx, http.MethodGet, fmt.Sprintf("http://127.0.0.1:%d/health/live", port), nil) //nolint:lll
+	req, err := http.NewRequestWithContext(c.ctx, http.MethodGet, fmt.Sprintf("http://127.0.0.1:%d/healthz", port), nil) //nolint:lll
 	if err != nil {
 		return err
 	}

internal/checkers/health_test.go

@@ -18,7 +18,7 @@ func (f httpClientFunc) Do(req *http.Request) (*http.Response, error) { return f
 func TestHealthChecker_CheckSuccess(t *testing.T) {
 	var httpMock httpClientFunc = func(req *http.Request) (*http.Response, error) {
 		assert.Equal(t, http.MethodGet, req.Method)
-		assert.Equal(t, "http://127.0.0.1:123/health/live", req.URL.String())
+		assert.Equal(t, "http://127.0.0.1:123/healthz", req.URL.String())
 		assert.Equal(t, "HealthChecker/internal", req.Header.Get("User-Agent"))
 
 		return &http.Response{

internal/cli/build/command.go

@@ -1,11 +1,8 @@
 package build
 
 import (
-	"bytes"
 	"os"
 	"path"
-	"text/template"
-	"time"
 
 	"github.com/pkg/errors"
 	"github.com/spf13/cobra"
@@ -14,12 +11,8 @@ import (
 	"go.uber.org/zap"
 )
 
-type historyItem struct {
-	Code, Message, Path string
-}
-
 // NewCommand creates `build` command.
-func NewCommand(log *zap.Logger, configFile *string) *cobra.Command { //nolint:funlen,gocognit
+func NewCommand(log *zap.Logger, configFile *string) *cobra.Command {
 	var (
 		generateIndex bool
 		cfg           *config.Config
@@ -30,94 +23,23 @@ func NewCommand(log *zap.Logger, configFile *string) *cobra.Command { //nolint:f
 		Aliases: []string{"b"},
 		Short:   "Build the error pages",
 		Args:    cobra.ExactArgs(1),
-		PreRunE: func(*cobra.Command, []string) error {
+		PreRunE: func(*cobra.Command, []string) (err error) {
 			if configFile == nil {
 				return errors.New("path to the config file is required for this command")
 			}
 
-			if c, err := config.FromYamlFile(*configFile); err != nil {
-				return err
-			} else {
-				if err = c.Validate(); err != nil {
+			if cfg, err = config.FromYamlFile(*configFile); err != nil {
 				return err
 			}
 
-				cfg = c
-			}
-
-			return nil
+			return
 		},
 		RunE: func(_ *cobra.Command, args []string) error {
 			if len(args) != 1 {
 				return errors.New("wrong arguments count")
 			}
 
-			log.Info("loading templates")
-
-			templates, err := cfg.LoadTemplates()
-			if err != nil {
-				return err
-			} else if len(templates) == 0 {
-				return errors.New("no loaded templates")
-			}
-
-			log.Debug("the output directory preparing", zap.String("Path", args[0]))
-
-			if err = createDirectory(args[0]); err != nil {
-				return errors.Wrap(err, "cannot prepare output directory")
-			}
-
-			codes := make(map[string]tpl.Annotator)
-
-			for code, desc := range cfg.Pages {
-				codes[code] = tpl.Annotator{Message: desc.Message, Description: desc.Description}
-			}
-
-			history := make(map[string][]historyItem, len(templates))
-
-			log.Info("saving the error pages")
-			startedAt := time.Now()
-
-			if err = tpl.NewErrors(templates, codes).VisitAll(func(template, code string, content []byte) error {
-				if e := createDirectory(path.Join(args[0], template)); e != nil {
-					return e
-				}
-
-				fileName := code + ".html"
-
-				if e := os.WriteFile(path.Join(args[0], template, fileName), content, 0664); e != nil { //nolint:gosec,gomnd
-					return e
-				}
-
-				if _, ok := history[template]; !ok {
-					history[template] = make([]historyItem, 0, len(codes))
-				}
-
-				history[template] = append(history[template], historyItem{
-					Code:    code,
-					Message: codes[code].Message,
-					Path:    path.Join(template, fileName),
-				})
-
-				return nil
-			}); err != nil {
-				return nil
-			}
-
-			log.Debug("saved", zap.Duration("duration", time.Since(startedAt)))
-
-			if generateIndex {
-				log.Info("index file generation")
-				startedAt = time.Now()
-
-				if err = writeIndexFile(path.Join(args[0], "index.html"), history); err != nil {
-					return err
-				}
-
-				log.Debug("index file generated", zap.Duration("duration", time.Since(startedAt)))
-			}
-
-			return nil
+			return run(log, cfg, args[0], generateIndex)
 		},
 	}
 
@@ -131,11 +53,87 @@ func NewCommand(log *zap.Logger, configFile *string) *cobra.Command { //nolint:f
 	return cmd
 }
 
-func createDirectory(path string) error {
+const (
+	outHTMLFileExt   = ".html"
+	outIndexFileName = "index"
+	outFilePerm      = os.FileMode(0664)
+	outDirPerm       = os.FileMode(0775)
+)
+
+func run(log *zap.Logger, cfg *config.Config, outDirectoryPath string, generateIndex bool) error { //nolint:funlen
+	if len(cfg.Templates) == 0 {
+		return errors.New("no loaded templates")
+	}
+
+	log.Info("output directory preparing", zap.String("path", outDirectoryPath))
+
+	if err := createDirectory(outDirectoryPath, outDirPerm); err != nil {
+		return errors.Wrap(err, "cannot prepare output directory")
+	}
+
+	history, renderer := newBuildingHistory(), tpl.NewTemplateRenderer()
+	defer func() { _ = renderer.Close() }()
+
+	for _, template := range cfg.Templates {
+		log.Debug("template processing", zap.String("name", template.Name()))
+
+		for _, page := range cfg.Pages {
+			if err := createDirectory(path.Join(outDirectoryPath, template.Name()), outDirPerm); err != nil {
+				return err
+			}
+
+			var (
+				fileName = page.Code() + outHTMLFileExt
+				filePath = path.Join(outDirectoryPath, template.Name(), fileName)
+			)
+
+			content, renderingErr := renderer.Render(template.Content(), tpl.Properties{
+				Code:               page.Code(),
+				Message:            page.Message(),
+				Description:        page.Description(),
+				ShowRequestDetails: false,
+			})
+			if renderingErr != nil {
+				return renderingErr
+			}
+
+			if err := os.WriteFile(filePath, content, outFilePerm); err != nil {
+				return err
+			}
+
+			log.Debug("page rendered", zap.String("path", filePath))
+
+			if generateIndex {
+				history.Append(
+					template.Name(),
+					page.Code(),
+					page.Message(),
+					path.Join(template.Name(), fileName),
+				)
+			}
+		}
+	}
+
+	if generateIndex {
+		var filepath = path.Join(outDirectoryPath, outIndexFileName+outHTMLFileExt)
+
+		log.Info("index file generation", zap.String("path", filepath))
+
+		if err := history.WriteIndexFile(filepath, outFilePerm); err != nil {
+			return err
+		}
+	}
+
+	log.Info("job is done")
+
+	return nil
+}
+
+func createDirectory(path string, perm os.FileMode) error {
 	stat, err := os.Stat(path)
 	if err != nil {
 		if os.IsNotExist(err) {
-			return os.MkdirAll(path, 0775) //nolint:gomnd
+			return os.MkdirAll(path, perm)
 		}
 
 		return err
@@ -147,52 +145,3 @@ func createDirectory(path string) error {
 
 	return nil
 }
-
-func writeIndexFile(path string, history map[string][]historyItem) error {
-	t, err := template.New("index").Parse(`<html lang="en">
-<head>
-  <meta charset="utf-8" />
-  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
-  <title>Error pages list</title>
-  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/5.1.1/css/bootstrap.min.css"
-    integrity="sha512-6KY5s6UI5J7SVYuZB4S/CZMyPylqyyNZco376NM2Z8Sb8OxEdp02e1jkKk/wZxIEmjQ6DRCEBhni+gpr9c4tvA=="
-    crossorigin="anonymous" referrerpolicy="no-referrer" />
-</head>
-<body class="bg-light">
-<div class="container">
-  <main>
-    <div class="py-5 text-center">
-      <img class="d-block mx-auto mb-4" src="https://hsto.org/webt/rm/9y/ww/rm9ywwx3gjv9agwkcmllhsuyo7k.png"
-           alt="" width="94">
-      <h2>Error pages index</h2>
-    </div>
-{{- range $template, $item := . -}}
-    <h2 class="mb-3">Template name: <Code>{{ $template }}</Code></h2>
-    <ul class="mb-5">
-	{{ range $item -}}
-      <li><a href="{{ .Path }}"><strong>{{ .Code }}</strong>: {{ .Message }}</a></li>
-	{{ end -}}
-    </ul>
-{{ end }}
-  </main>
-</div>
-<footer class="footer">
-  <div class="container text-center text-muted mt-3 mb-3">
-    For online documentation and support please refer to the
-      <a href="https://github.com/tarampampam/error-pages">project repository</a>.
-  </div>
-</footer>
-</body>
-</html>`)
-	if err != nil {
-		return err
-	}
-
-	var buf bytes.Buffer
-
-	if err = t.Execute(&buf, history); err != nil {
-		return err
-	}
-
-	return os.WriteFile(path, buf.Bytes(), 0664) //nolint:gosec,gomnd
-}

internal/cli/build/history.go

@@ -0,0 +1,59 @@
+package build
+
+import (
+	"bytes"
+	_ "embed"
+	"os"
+	"sort"
+	"text/template"
+)
+
+type (
+	buildingHistory struct {
+		items map[string][]historyItem
+	}
+
+	historyItem struct {
+		Code, Message, Path string
+	}
+)
+
+func newBuildingHistory() buildingHistory {
+	return buildingHistory{items: make(map[string][]historyItem)}
+}
+
+func (bh *buildingHistory) Append(templateName, pageCode, message, path string) {
+	if _, ok := bh.items[templateName]; !ok {
+		bh.items[templateName] = make([]historyItem, 0)
+	}
+
+	bh.items[templateName] = append(bh.items[templateName], historyItem{
+		Code:    pageCode,
+		Message: message,
+		Path:    path,
+	})
+
+	sort.Slice(bh.items[templateName], func(i, j int) bool { // keep history items sorted
+		return bh.items[templateName][i].Code < bh.items[templateName][j].Code
+	})
+}
+
+//go:embed index.tpl.html
+var indexPageTemplate string
+
+func (bh *buildingHistory) WriteIndexFile(path string, perm os.FileMode) error {
+	t, err := template.New("index").Parse(indexPageTemplate)
+	if err != nil {
+		return err
+	}
+
+	var buf bytes.Buffer
+
+	if err = t.Execute(&buf, bh.items); err != nil {
+		return err
+	}
+
+	defer buf.Reset() // optimization (is needed here?)
+
+	return os.WriteFile(path, buf.Bytes(), perm)
+}

internal/cli/build/index.tpl.html

@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="utf-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
+    <title>Error pages list</title>
+    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/5.1.3/css/bootstrap.min.css"
+          integrity="sha512-GQGU0fMMi238uA+a/bdWJfpUGKUkBdgfFdgBm72SUQ6BeyWjoY/ton0tEjH+OSH9iP4Dfh+7HM0I9f5eR0L/4w=="
+          crossorigin="anonymous" referrerpolicy="no-referrer" />
+    <style>
+        @media (prefers-color-scheme:dark){
+            :root {--bs-light:#212529;--bs-light-rgb:33,37,41;--bs-body-color:#eee}a{color:#91b4e8}a:hover{color:#a2bfec}
+        }
+    </style>
+</head>
+<body class="bg-light">
+<div class="container">
+    <main>
+        <div class="py-5 text-center">
+            <img class="d-block mx-auto mb-4" src="https://hsto.org/webt/rm/9y/ww/rm9ywwx3gjv9agwkcmllhsuyo7k.png"
+                 alt="" width="94">
+            <h2>Error pages index</h2>
+        </div>
+        {{- range $template, $item := . -}}
+        <h2 class="mb-3">Template name: <Code>{{ $template }}</Code></h2>
+        <ul class="mb-5">
+            {{ range $item -}}
+            <li><a href="{{ .Path }}"><strong>{{ .Code }}</strong>: {{ .Message }}</a></li>
+            {{ end -}}
+        </ul>
+        {{ end }}
+    </main>
+</div>
+<footer class="footer">
+    <div class="container text-center text-muted mt-3 mb-3">
+        For online documentation and support please refer to the
+        <a href="https://github.com/tarampampam/error-pages">project repository</a>.
+    </div>
+</footer>
+</body>
+</html>

internal/cli/serve/command.go

@@ -6,14 +6,12 @@ import (
 	"os"
 	"time"
 
-	"github.com/tarampampam/error-pages/internal/http/handlers/errorpage"
-	"github.com/tarampampam/error-pages/internal/tpl"
-	"go.uber.org/zap"
-
 	"github.com/spf13/cobra"
 	"github.com/tarampampam/error-pages/internal/breaker"
 	"github.com/tarampampam/error-pages/internal/config"
 	appHttp "github.com/tarampampam/error-pages/internal/http"
+	"github.com/tarampampam/error-pages/internal/pick"
+	"go.uber.org/zap"
 )
 
 // NewCommand creates `serve` command.
@@ -27,23 +25,17 @@ func NewCommand(ctx context.Context, log *zap.Logger, configFile *string) *cobra
 		Use:     "serve",
 		Aliases: []string{"s", "server"},
 		Short:   "Start HTTP server",
-		PreRunE: func(cmd *cobra.Command, _ []string) error {
+		PreRunE: func(cmd *cobra.Command, _ []string) (err error) {
 			if configFile == nil {
 				return errors.New("path to the config file is required for this command")
 			}
 
-			if err := f.overrideUsingEnv(cmd.Flags()); err != nil {
+			if err = f.overrideUsingEnv(cmd.Flags()); err != nil {
 				return err
 			}
 
-			if c, err := config.FromYamlFile(*configFile); err != nil {
+			if cfg, err = config.FromYamlFile(*configFile); err != nil {
 				return err
-			} else {
-				if err = c.Validate(); err != nil {
-					return err
-				}
-
-				cfg = c
 			}
 
 			return f.validate()
@@ -56,8 +48,6 @@ func NewCommand(ctx context.Context, log *zap.Logger, configFile *string) *cobra
 	return cmd
 }
 
-const serverShutdownTimeout = 15 * time.Second
-
 // run current command.
 func run(parentCtx context.Context, log *zap.Logger, f flags, cfg *config.Config) error { //nolint:funlen
 	var (
@@ -77,35 +67,64 @@ func run(parentCtx context.Context, log *zap.Logger, f flags, cfg *config.Config
 		oss.Stop() // stop system signals listening
 	}()
 
-	// load templates content
-	templates, loadingErr := cfg.LoadTemplates()
-	if loadingErr != nil {
-		return loadingErr
-	} else if len(templates) == 0 {
-		return errors.New("no loaded templates")
-	}
+	var (
+		templateNames = cfg.TemplateNames()
+		picker        interface{ Pick() string }
+	)
 
-	if f.template.name != "" && f.template.name != errorpage.UseRandom && f.template.name != errorpage.UseRandomOnEachRequest { //nolint:lll
-		if _, found := templates[f.template.name]; !found {
-			return errors.New("requested nonexistent template: " + f.template.name) // requested unknown template
+	switch f.template.name {
+	case useRandomTemplate:
+		log.Info("A random template will be used")
+
+		picker = pick.NewStringsSlice(templateNames, pick.RandomOnce)
+
+	case useRandomTemplateOnEachRequest:
+		log.Info("A random template on EACH request will be used")
+
+		picker = pick.NewStringsSlice(templateNames, pick.RandomEveryTime)
+
+	case useRandomTemplateDaily:
+		log.Info("A random template will be used and changed once a day")
+
+		picker = pick.NewStringsSliceWithInterval(templateNames, pick.RandomEveryTime, time.Hour*24) //nolint:gomnd
+
+	case useRandomTemplateHourly:
+		log.Info("A random template will be used and changed hourly")
+
+		picker = pick.NewStringsSliceWithInterval(templateNames, pick.RandomEveryTime, time.Hour)
+
+	case "":
+		log.Info("The first template (ordered by name) will be used")
+
+		picker = pick.NewStringsSlice(templateNames, pick.First)
+
+	default:
+		if t, found := cfg.Template(f.template.name); found {
+			log.Info("We will use the requested template", zap.String("name", t.Name()))
+			picker = pick.NewStringsSlice([]string{t.Name()}, pick.First)
+		} else {
+			return errors.New("requested nonexistent template: " + f.template.name)
 		}
 	}
 
-	// burn the error codes map
-	codes := make(map[string]tpl.Annotator)
-	for code, desc := range cfg.Pages {
-		codes[code] = tpl.Annotator{Message: desc.Message, Description: desc.Description}
-	}
+	var proxyHTTPHeaders = f.HeadersToProxy()
 
 	// create HTTP server
 	server := appHttp.NewServer(log)
 
 	// register server routes, middlewares, etc.
-	if err := server.Register(f.template.name, templates, codes); err != nil {
+	if err := server.Register(
+		cfg,
+		picker,
+		f.defaultErrorPage,
+		f.defaultHTTPCode,
+		f.showDetails,
+		proxyHTTPHeaders,
+	); err != nil {
 		return err
 	}
 
-	startingErrCh := make(chan error, 1) // channel for server starting error
+	startedAt, startingErrCh := time.Now(), make(chan error, 1) // channel for server starting error
 
 	// start HTTP server in separate goroutine
 	go func(errCh chan<- error) {
@@ -114,7 +133,10 @@ func run(parentCtx context.Context, log *zap.Logger, f flags, cfg *config.Config
 		log.Info("Server starting",
 			zap.String("addr", f.listen.ip),
 			zap.Uint16("port", f.listen.port),
-			zap.String("template name", f.template.name),
+			zap.String("default error page", f.defaultErrorPage),
+			zap.Uint16("default HTTP response code", f.defaultHTTPCode),
+			zap.Strings("proxy headers", proxyHTTPHeaders),
+			zap.Bool("show request details", f.showDetails),
 		)
 
 		if err := server.Start(f.listen.ip, f.listen.port); err != nil {
@@ -128,20 +150,18 @@ func run(parentCtx context.Context, log *zap.Logger, f flags, cfg *config.Config
 		return err
 
 	case <-ctx.Done(): // ..or context cancellation
-		log.Info("Gracefully server stopping")
-
-		stoppedAt := time.Now()
-
-		// stop the server using created context above
-		if err := server.Stop(serverShutdownTimeout); err != nil {
-			if errors.Is(err, context.DeadlineExceeded) {
-				log.Error("Server stopping timeout exceeded", zap.Duration("timeout", serverShutdownTimeout))
-			}
+		log.Info("Gracefully server stopping", zap.Duration("uptime", time.Since(startedAt)))
 
+		if p, ok := picker.(interface{ Close() error }); ok {
+			if err := p.Close(); err != nil {
 				return err
 			}
+		}
 
-		log.Debug("Server stopped", zap.Duration("stopping duration", time.Since(stoppedAt)))
+		// stop the server using created context above
+		if err := server.Stop(); err != nil {
+			return err
+		}
 	}
 
 	return nil

internal/cli/serve/flags.go

@@ -3,11 +3,10 @@ package serve
 import (
 	"fmt"
 	"net"
+	"sort"
 	"strconv"
 	"strings"
 
-	"github.com/tarampampam/error-pages/internal/http/handlers/errorpage"
-
 	"github.com/spf13/pflag"
 	"github.com/tarampampam/error-pages/internal/env"
 )
@@ -20,12 +19,65 @@ type flags struct {
 	template struct {
 		name string
 	}
+	defaultErrorPage string
+	defaultHTTPCode  uint16
+	showDetails      bool
+	proxyHTTPHeaders string // comma-separated
+}
+
+// HeadersToProxy converts a comma-separated string with headers list into strings slice (with a sorting and without
+// duplicates).
+func (f *flags) HeadersToProxy() []string {
+	var raw = strings.Split(f.proxyHTTPHeaders, ",")
+
+	if len(raw) == 0 {
+		return []string{}
+	} else if len(raw) == 1 {
+		if h := strings.TrimSpace(raw[0]); h != "" {
+			return []string{h}
+		} else {
+			return []string{}
+		}
+	}
+
+	var m = make(map[string]struct{}, len(raw))
+
+	// make unique and ignore empty strings
+	for _, h := range raw {
+		if h = strings.TrimSpace(h); h != "" {
+			if _, ok := m[h]; !ok {
+				m[h] = struct{}{}
+			}
+		}
+	}
+
+	// convert map into slice
+	var headers = make([]string, 0, len(m))
+	for h := range m {
+		headers = append(headers, h)
+	}
+
+	// make sort
+	sort.Strings(headers)
+
+	return headers
 }
 
 const (
 	listenFlagName           = "listen"
 	portFlagName             = "port"
 	templateNameFlagName     = "template-name"
+	defaultErrorPageFlagName = "default-error-page"
+	defaultHTTPCodeFlagName  = "default-http-code"
+	showDetailsFlagName      = "show-details"
+	proxyHTTPHeadersFlagName = "proxy-headers"
+)
+
+const (
+	useRandomTemplate              = "random"
+	useRandomTemplateOnEachRequest = "i-said-random"
+	useRandomTemplateDaily         = "random-daily"
+	useRandomTemplateHourly        = "random-hourly"
 )
 
 func (f *flags) init(flagSet *pflag.FlagSet) {
@@ -46,13 +98,42 @@ func (f *flags) init(flagSet *pflag.FlagSet) {
 		templateNameFlagName, "t",
 		"",
 		fmt.Sprintf(
-			"template name (set \"%s\" to use the randomized or \"%s\" to use the randomized template on each request) [$%s]", //nolint:lll
-			errorpage.UseRandom, errorpage.UseRandomOnEachRequest, env.TemplateName,
+			"template name (set \"%s\" to use a randomized or \"%s\" to use a randomized template on each request "+
+				"or \"%s/%s\" daily/hourly randomized) [$%s]",
+			useRandomTemplate,
+			useRandomTemplateOnEachRequest,
+			useRandomTemplateDaily,
+			useRandomTemplateHourly,
+			env.TemplateName,
 		),
 	)
+	flagSet.StringVarP(
+		&f.defaultErrorPage,
+		defaultErrorPageFlagName, "",
+		"404",
+		fmt.Sprintf("default error page [$%s]", env.DefaultErrorPage),
+	)
+	flagSet.Uint16VarP(
+		&f.defaultHTTPCode,
+		defaultHTTPCodeFlagName, "",
+		404, //nolint:gomnd
+		fmt.Sprintf("default HTTP response code [$%s]", env.DefaultHTTPCode),
+	)
+	flagSet.BoolVarP(
+		&f.showDetails,
+		showDetailsFlagName, "",
+		false,
+		fmt.Sprintf("show request details in response [$%s]", env.ShowDetails),
+	)
+	flagSet.StringVarP(
+		&f.proxyHTTPHeaders,
+		proxyHTTPHeadersFlagName, "",
+		"",
+		fmt.Sprintf("proxy HTTP request headers list (comma-separated) [$%s]", env.ProxyHTTPHeaders),
+	)
 }
 
-func (f *flags) overrideUsingEnv(flagSet *pflag.FlagSet) (lastErr error) {
+func (f *flags) overrideUsingEnv(flagSet *pflag.FlagSet) (lastErr error) { //nolint:gocognit,gocyclo
 	flagSet.VisitAll(func(flag *pflag.Flag) {
 		// flag was NOT defined using CLI (flags should have maximal priority)
 		if !flag.Changed { //nolint:nestif
@@ -75,6 +156,32 @@ func (f *flags) overrideUsingEnv(flagSet *pflag.FlagSet) (lastErr error) {
 				if envVar, exists := env.TemplateName.Lookup(); exists {
 					f.template.name = strings.TrimSpace(envVar)
 				}
+
+			case defaultErrorPageFlagName:
+				if envVar, exists := env.DefaultErrorPage.Lookup(); exists {
+					f.defaultErrorPage = strings.TrimSpace(envVar)
+				}
+
+			case defaultHTTPCodeFlagName:
+				if envVar, exists := env.DefaultHTTPCode.Lookup(); exists {
+					if code, err := strconv.ParseUint(envVar, 10, 16); err == nil { //nolint:gomnd
+						f.defaultHTTPCode = uint16(code)
+					} else {
+						lastErr = fmt.Errorf("wrong default HTTP response code environment variable [%s] value", envVar)
+					}
+				}
+
+			case showDetailsFlagName:
+				if envVar, exists := env.ShowDetails.Lookup(); exists {
+					if b, err := strconv.ParseBool(envVar); err == nil {
+						f.showDetails = b
+					}
+				}
+
+			case proxyHTTPHeadersFlagName:
+				if envVar, exists := env.ProxyHTTPHeaders.Lookup(); exists {
+					f.proxyHTTPHeaders = strings.TrimSpace(envVar)
+				}
 			}
 		}
 	})
@@ -87,5 +194,13 @@ func (f *flags) validate() error {
 		return fmt.Errorf("wrong IP address [%s] for listening", f.listen.ip)
 	}
 
+	if f.defaultHTTPCode > 599 { //nolint:gomnd
+		return fmt.Errorf("wrong default HTTP response code [%d]", f.defaultHTTPCode)
+	}
+
+	if strings.ContainsRune(f.proxyHTTPHeaders, ' ') {
+		return fmt.Errorf("whitespaces in the HTTP headers for proxying [%s] are not allowed", f.proxyHTTPHeaders)
+	}
+
 	return nil
 }

internal/config/config.go

@@ -2,6 +2,8 @@ package config
 
 import (
 	"io/ioutil"
+	"os"
+	"path"
 	"path/filepath"
 	"strconv"
 	"strings"
@@ -11,20 +13,116 @@ import (
 	"gopkg.in/yaml.v3"
 )
 
+// Config is a main (exportable) config struct.
 type Config struct {
+	Templates []Template
+	Pages     map[string]Page   // map key is a page code
+	Formats   map[string]Format // map key is a format name
+}
+
+// Template returns a Template with the passes name.
+func (c *Config) Template(name string) (*Template, bool) {
+	for i := 0; i < len(c.Templates); i++ {
+		if c.Templates[i].name == name {
+			return &c.Templates[i], true
+		}
+	}
+
+	return &Template{}, false
+}
+
+func (c *Config) JSONFormat() (*Format, bool) { return c.format("json") }
+func (c *Config) XMLFormat() (*Format, bool)  { return c.format("xml") }
+
+func (c *Config) format(name string) (*Format, bool) {
+	if f, ok := c.Formats[name]; ok {
+		if len(f.content) > 0 {
+			return &f, true
+		}
+	}
+
+	return &Format{}, false
+}
+
+// TemplateNames returns all template names.
+func (c *Config) TemplateNames() []string {
+	n := make([]string, len(c.Templates))
+
+	for i, t := range c.Templates {
+		n[i] = t.name
+	}
+
+	return n
+}
+
+// Template describes HTTP error page template.
+type Template struct {
+	name    string
+	content []byte
+}
+
+// Name returns the name of the template.
+func (t Template) Name() string { return t.name }
+
+// Content returns the template content.
+func (t Template) Content() []byte { return t.content }
+
+func (t *Template) loadContentFromFile(filePath string) (err error) {
+	if t.content, err = ioutil.ReadFile(filePath); err != nil {
+		return errors.Wrap(err, "cannot load content for the template "+t.Name()+" from file "+filePath)
+	}
+
+	return
+}
+
+// Page describes error page.
+type Page struct {
+	code        string
+	message     string
+	description string
+}
+
+// Code returns the code of the Page.
+func (p Page) Code() string { return p.code }
+
+// Message returns the message of the Page.
+func (p Page) Message() string { return p.message }
+
+// Description returns the description of the Page.
+func (p Page) Description() string { return p.description }
+
+// Format describes different response formats.
+type Format struct {
+	name    string
+	content []byte
+}
+
+// Name returns the name of the format.
+func (f Format) Name() string { return f.name }
+
+// Content returns the format content.
+func (f Format) Content() []byte { return f.content }
+
+// config is internal struct for marshaling/unmarshaling configuration file content.
+type config struct {
 	Templates []struct {
 		Path    string `yaml:"path"`
 		Name    string `yaml:"name"`
 		Content string `yaml:"content"`
 	} `yaml:"templates"`
+
+	Formats map[string]struct {
+		Content string `yaml:"content"`
+	} `yaml:"formats"`
+
 	Pages map[string]struct {
 		Message     string `yaml:"message"`
 		Description string `yaml:"description"`
 	} `yaml:"pages"`
 }
 
-// Validate the config and return an error if something is wrong.
-func (c Config) Validate() error {
+// Validate the config struct and return an error if something is wrong.
+func (c config) Validate() error {
 	if len(c.Templates) == 0 {
 		return errors.New("empty templates list")
 	} else {
@@ -53,64 +151,106 @@ func (c Config) Validate() error {
 		}
 	}
 
+	if len(c.Formats) > 0 {
+		for name := range c.Formats {
+			if name == "" {
+				return errors.New("empty format name")
+			}
+
+			if strings.ContainsRune(name, ' ') {
+				return errors.New("format should not contain whitespaces")
+			}
+		}
+	}
+
 	return nil
 }
 
-// LoadTemplates loading templates content from the local files and return it.
-func (c Config) LoadTemplates() (map[string][]byte, error) {
-	var templates = make(map[string][]byte)
+// Export the config struct into Config.
+func (c *config) Export() (*Config, error) {
+	cfg := &Config{}
+
+	cfg.Templates = make([]Template, 0, len(c.Templates))
 
 	for i := 0; i < len(c.Templates); i++ {
-		var name string
-
-		if c.Templates[i].Name == "" {
-			basename := filepath.Base(c.Templates[i].Path)
-			name = strings.TrimSuffix(basename, filepath.Ext(basename))
-		} else {
-			name = c.Templates[i].Name
-		}
-
-		var content []byte
+		tpl := Template{name: c.Templates[i].Name}
 
 		if c.Templates[i].Content == "" {
-			b, err := ioutil.ReadFile(c.Templates[i].Path)
-			if err != nil {
-				return nil, errors.Wrap(err, "cannot load content for the template "+name)
+			if c.Templates[i].Path == "" {
+				return nil, errors.New("path to the template " + c.Templates[i].Name + " not provided")
 			}
 
-			content = b
+			if err := tpl.loadContentFromFile(c.Templates[i].Path); err != nil {
+				return nil, err
+			}
 		} else {
-			content = []byte(c.Templates[i].Content)
+			tpl.content = []byte(c.Templates[i].Content)
 		}
 
-		templates[name] = content
+		cfg.Templates = append(cfg.Templates, tpl)
 	}
 
-	return templates, nil
+	cfg.Pages = make(map[string]Page, len(c.Pages))
+
+	for code, p := range c.Pages {
+		cfg.Pages[code] = Page{code: code, message: p.Message, description: p.Description}
 	}
 
-// FromYaml creates new config instance using YAML-structured content.
-func FromYaml(in []byte) (cfg *Config, err error) {
-	cfg = &Config{}
+	cfg.Formats = make(map[string]Format, len(c.Formats))
 
+	for name, f := range c.Formats {
+		cfg.Formats[name] = Format{name: name, content: []byte(strings.TrimSpace(f.Content))}
+	}
+
+	return cfg, nil
+}
+
+// FromYaml creates new Config instance using YAML-structured content.
+func FromYaml(in []byte) (_ *Config, err error) {
 	in, err = envsubst.Bytes(in)
 	if err != nil {
 		return nil, err
 	}
 
-	if err = yaml.Unmarshal(in, cfg); err != nil {
+	c := &config{}
+
+	if err = yaml.Unmarshal(in, c); err != nil {
 		return nil, errors.Wrap(err, "cannot parse configuration file")
 	}
 
-	return
+	var basename string
+
+	for i := 0; i < len(c.Templates); i++ {
+		if c.Templates[i].Name == "" { // set the template name from file path
+			basename = filepath.Base(c.Templates[i].Path)
+			c.Templates[i].Name = strings.TrimSuffix(basename, filepath.Ext(basename))
+		}
 	}
 
-// FromYamlFile creates new config instance using YAML file.
+	if err = c.Validate(); err != nil {
+		return nil, err
+	}
+
+	return c.Export()
+}
+
+// FromYamlFile creates new Config instance using YAML file.
 func FromYamlFile(filepath string) (*Config, error) {
 	bytes, err := ioutil.ReadFile(filepath)
 	if err != nil {
 		return nil, errors.Wrap(err, "cannot read configuration file")
 	}
 
+	// the following code makes it possible to use the relative links in the config file (`.` means "directory with
+	// the config file")
+	cwd, err := os.Getwd()
+	if err == nil {
+		if err = os.Chdir(path.Dir(filepath)); err != nil {
+			return nil, err
+		}
+
+		defer func() { _ = os.Chdir(cwd) }()
+	}
+
 	return FromYaml(bytes)
 }

internal/config/config_test.go

@@ -1,7 +1,6 @@
 package config_test
 
 import (
-	"errors"
 	"os"
 	"testing"
 
@@ -9,196 +8,35 @@ import (
 	"github.com/tarampampam/error-pages/internal/config"
 )
 
-func TestConfig_Validate(t *testing.T) {
-	for name, tt := range map[string]struct {
-		giveConfig func() config.Config
-		wantError  error
-	}{
-		"valid": {
-			giveConfig: func() config.Config {
-				c := config.Config{}
-
-				c.Templates = []struct {
-					Path    string `yaml:"path"`
-					Name    string `yaml:"name"`
-					Content string `yaml:"content"`
-				}{
-					{"foo", "bar", "baz"},
-				}
-
-				c.Pages = map[string]struct {
-					Message     string `yaml:"message"`
-					Description string `yaml:"description"`
-				}{
-					"400": {"Bad Request", "The server did not understand the request"},
-				}
-
-				return c
-			},
-			wantError: nil,
-		},
-		"empty templates list": {
-			giveConfig: func() config.Config {
-				return config.Config{}
-			},
-			wantError: errors.New("empty templates list"),
-		},
-		"empty path and name": {
-			giveConfig: func() config.Config {
-				c := config.Config{}
-
-				c.Templates = []struct {
-					Path    string `yaml:"path"`
-					Name    string `yaml:"name"`
-					Content string `yaml:"content"`
-				}{
-					{
-						Path:    "foo",
-						Name:    "bar",
-						Content: "baz",
-					},
-					{
-						Path:    "",
-						Name:    "",
-						Content: "blah",
-					},
-				}
-
-				return c
-			},
-			wantError: errors.New("empty path and name with index 1"),
-		},
-		"empty path and template content": {
-			giveConfig: func() config.Config {
-				c := config.Config{}
-
-				c.Templates = []struct {
-					Path    string `yaml:"path"`
-					Name    string `yaml:"name"`
-					Content string `yaml:"content"`
-				}{
-					{
-						Path:    "foo",
-						Name:    "bar",
-						Content: "baz",
-					},
-					{
-						Path:    "",
-						Name:    "blah",
-						Content: "",
-					},
-				}
-
-				return c
-			},
-			wantError: errors.New("empty path and template content with index 1"),
-		},
-		"empty pages list": {
-			giveConfig: func() config.Config {
-				c := config.Config{}
-
-				c.Templates = []struct {
-					Path    string `yaml:"path"`
-					Name    string `yaml:"name"`
-					Content string `yaml:"content"`
-				}{
-					{"foo", "bar", "baz"},
-				}
-
-				c.Pages = map[string]struct {
-					Message     string `yaml:"message"`
-					Description string `yaml:"description"`
-				}{}
-
-				return c
-			},
-			wantError: errors.New("empty pages list"),
-		},
-		"empty page code": {
-			giveConfig: func() config.Config {
-				c := config.Config{}
-
-				c.Templates = []struct {
-					Path    string `yaml:"path"`
-					Name    string `yaml:"name"`
-					Content string `yaml:"content"`
-				}{
-					{"foo", "bar", "baz"},
-				}
-
-				c.Pages = map[string]struct {
-					Message     string `yaml:"message"`
-					Description string `yaml:"description"`
-				}{
-					"": {"foo", "bar"},
-				}
-
-				return c
-			},
-			wantError: errors.New("empty page code"),
-		},
-		"code should not contain whitespaces": {
-			giveConfig: func() config.Config {
-				c := config.Config{}
-
-				c.Templates = []struct {
-					Path    string `yaml:"path"`
-					Name    string `yaml:"name"`
-					Content string `yaml:"content"`
-				}{
-					{"foo", "bar", "baz"},
-				}
-
-				c.Pages = map[string]struct {
-					Message     string `yaml:"message"`
-					Description string `yaml:"description"`
-				}{
-					" 123": {"foo", "bar"},
-				}
-
-				return c
-			},
-			wantError: errors.New("code should not contain whitespaces"),
-		},
-	} {
-		tt := tt
-
-		t.Run(name, func(t *testing.T) {
-			err := tt.giveConfig().Validate()
-
-			if tt.wantError != nil {
-				assert.EqualError(t, err, tt.wantError.Error())
-			} else {
-				assert.NoError(t, err)
-			}
-		})
-	}
-}
-
 func TestFromYaml(t *testing.T) {
-	var cases = []struct { //nolint:maligned
-		name          string
+	var cases = map[string]struct { //nolint:maligned
 		giveYaml      []byte
 		giveEnv       map[string]string
 		wantErr       bool
 		checkResultFn func(*testing.T, *config.Config)
 	}{
-		{
-			name: "with all possible values",
+		"with all possible values": {
 			giveEnv: map[string]string{
-				"__GHOST_PATH": "./templates/ghost.html",
-				"__GHOST_NAME": "ghost",
+				"__FOO_TPL_PATH": "./testdata/foo-tpl.html",
+				"__FOO_TPL_NAME": "Foo Template",
 			},
 			giveYaml: []byte(`
 templates:
-  - path: ${__GHOST_PATH}
-    name: ${__GHOST_NAME:-default_value} # name is optional
-  - path: ./templates/l7-light.html
-  - name: Foo
+  - path: ${__FOO_TPL_PATH}
+    name: ${__FOO_TPL_NAME:-default_value} # name is optional
+  - path: ./testdata/bar-tpl.html
+  - name: Baz
     content: |
-      Some content
+      Some content {{ code }}
       New line
 
+formats:
+  json:
+    content: |
+      {"code": "{{code}}"}
+  Avada_Kedavra:
+    content: "{{ message }}"
+
 pages:
   400:
     message: Bad Request
@@ -211,33 +49,66 @@ pages:
 			wantErr: false,
 			checkResultFn: func(t *testing.T, cfg *config.Config) {
 				assert.Len(t, cfg.Templates, 3)
-				assert.Equal(t, "./templates/ghost.html", cfg.Templates[0].Path)
-				assert.Equal(t, "ghost", cfg.Templates[0].Name)
-				assert.Equal(t, "", cfg.Templates[0].Content)
-				assert.Equal(t, "./templates/l7-light.html", cfg.Templates[1].Path)
-				assert.Equal(t, "", cfg.Templates[1].Name)
-				assert.Equal(t, "", cfg.Templates[1].Content)
-				assert.Equal(t, "", cfg.Templates[2].Path)
-				assert.Equal(t, "Foo", cfg.Templates[2].Name)
-				assert.Equal(t, "Some content\nNew line\n", cfg.Templates[2].Content)
+
+				tpl, found := cfg.Template("Foo Template")
+				assert.True(t, found)
+				assert.Equal(t, "Foo Template", tpl.Name())
+				assert.Equal(t, "<html><body>foo {{ code }}</body></html>\n", string(tpl.Content()))
+
+				tpl, found = cfg.Template("bar-tpl")
+				assert.True(t, found)
+				assert.Equal(t, "bar-tpl", tpl.Name())
+				assert.Equal(t, "<html><body>bar {{ code }}</body></html>\n", string(tpl.Content()))
+
+				tpl, found = cfg.Template("Baz")
+				assert.True(t, found)
+				assert.Equal(t, "Baz", tpl.Name())
+				assert.Equal(t, "Some content {{ code }}\nNew line\n", string(tpl.Content()))
+
+				tpl, found = cfg.Template("NonExists")
+				assert.False(t, found)
+				assert.Equal(t, "", tpl.Name())
+				assert.Equal(t, "", string(tpl.Content()))
+
+				assert.Len(t, cfg.Formats, 2)
+
+				format, found := cfg.Formats["json"]
+				assert.True(t, found)
+				assert.Equal(t, `{"code": "{{code}}"}`, string(format.Content()))
+
+				format, found = cfg.Formats["Avada_Kedavra"]
+				assert.True(t, found)
+				assert.Equal(t, "{{ message }}", string(format.Content()))
 
 				assert.Len(t, cfg.Pages, 2)
-				assert.Equal(t, "Bad Request", cfg.Pages["400"].Message)
-				assert.Equal(t, "The server did not understand the request", cfg.Pages["400"].Description)
-				assert.Equal(t, "Unauthorized", cfg.Pages["401"].Message)
-				assert.Equal(t, "The requested page needs a username and a password", cfg.Pages["401"].Description)
+
+				errPage, found := cfg.Pages["400"]
+				assert.True(t, found)
+				assert.Equal(t, "400", errPage.Code())
+				assert.Equal(t, "Bad Request", errPage.Message())
+				assert.Equal(t, "The server did not understand the request", errPage.Description())
+
+				errPage, found = cfg.Pages["401"]
+				assert.True(t, found)
+				assert.Equal(t, "401", errPage.Code())
+				assert.Equal(t, "Unauthorized", errPage.Message())
+				assert.Equal(t, "The requested page needs a username and a password", errPage.Description())
+
+				errPage, found = cfg.Pages["666"]
+				assert.False(t, found)
+				assert.Equal(t, "", errPage.Message())
+				assert.Equal(t, "", errPage.Code())
+				assert.Equal(t, "", errPage.Description())
 			},
 		},
-		{
-			name:     "broken yaml",
+		"broken yaml": {
 			giveYaml: []byte(`foo bar`),
 			wantErr:  true,
 		},
 	}
 
-	for _, tt := range cases {
-		tt := tt
-		t.Run(tt.name, func(t *testing.T) {
+	for name, tt := range cases {
+		t.Run(name, func(t *testing.T) {
 			if tt.giveEnv != nil {
 				for key, value := range tt.giveEnv {
 					assert.NoError(t, os.Setenv(key, value))
@@ -263,45 +134,54 @@ pages:
 }
 
 func TestFromYamlFile(t *testing.T) {
-	var cases = []struct { //nolint:maligned
-		name             string
+	var cases = map[string]struct { //nolint:maligned
 		giveYamlFilePath string
 		wantErr          bool
 		checkResultFn    func(*testing.T, *config.Config)
 	}{
-		{
-			name:             "with all possible values",
+		"with all possible values": {
 			giveYamlFilePath: "./testdata/simple.yml",
 			wantErr:          false,
 			checkResultFn: func(t *testing.T, cfg *config.Config) {
 				assert.Len(t, cfg.Templates, 2)
-				assert.Equal(t, "./templates/ghost.html", cfg.Templates[0].Path)
-				assert.Equal(t, "ghost", cfg.Templates[0].Name)
-				assert.Equal(t, "./templates/l7-light.html", cfg.Templates[1].Path)
-				assert.Equal(t, "", cfg.Templates[1].Name)
+
+				tpl, found := cfg.Template("ghost")
+				assert.True(t, found)
+				assert.Equal(t, "ghost", tpl.Name())
+				assert.Equal(t, "<html><body>foo {{ code }}</body></html>\n", string(tpl.Content()))
+
+				tpl, found = cfg.Template("bar-tpl")
+				assert.True(t, found)
+				assert.Equal(t, "bar-tpl", tpl.Name())
+				assert.Equal(t, "<html><body>bar {{ code }}</body></html>\n", string(tpl.Content()))
 
 				assert.Len(t, cfg.Pages, 2)
-				assert.Equal(t, "Bad Request", cfg.Pages["400"].Message)
-				assert.Equal(t, "The server did not understand the request", cfg.Pages["400"].Description)
-				assert.Equal(t, "Unauthorized", cfg.Pages["401"].Message)
-				assert.Equal(t, "The requested page needs a username and a password", cfg.Pages["401"].Description)
+
+				errPage, found := cfg.Pages["400"]
+				assert.True(t, found)
+				assert.Equal(t, "400", errPage.Code())
+				assert.Equal(t, "Bad Request", errPage.Message())
+				assert.Equal(t, "The server did not understand the request", errPage.Description())
+
+				errPage, found = cfg.Pages["401"]
+				assert.True(t, found)
+				assert.Equal(t, "401", errPage.Code())
+				assert.Equal(t, "Unauthorized", errPage.Message())
+				assert.Equal(t, "The requested page needs a username and a password", errPage.Description())
 			},
 		},
-		{
-			name:             "broken yaml",
+		"broken yaml": {
 			giveYamlFilePath: "./testdata/broken.yml",
 			wantErr:          true,
 		},
-		{
-			name:             "wrong file path",
+		"wrong file path": {
 			giveYamlFilePath: "foo bar",
 			wantErr:          true,
 		},
 	}
 
-	for _, tt := range cases {
-		tt := tt
-		t.Run(tt.name, func(t *testing.T) {
+	for name, tt := range cases {
+		t.Run(name, func(t *testing.T) {
 			conf, err := config.FromYamlFile(tt.giveYamlFilePath)
 
 			if tt.wantErr {

internal/config/testdata/bar-tpl.html

@@ -0,0 +1 @@
+<html><body>bar {{ code }}</body></html>

internal/config/testdata/foo-tpl.html

@@ -0,0 +1 @@
+<html><body>foo {{ code }}</body></html>

internal/config/testdata/simple.yml

@@ -1,7 +1,7 @@
 templates:
-  - path: ./templates/ghost.html
+  - path: ./foo-tpl.html
     name: ghost # name is optional
-  - path: ./templates/l7-light.html
+  - path: ./bar-tpl.html
 
 pages:
   400:

internal/env/env.go

@@ -10,6 +10,10 @@ const (
 	ListenPort       envVariable = "LISTEN_PORT"        // port number for listening
 	TemplateName     envVariable = "TEMPLATE_NAME"      // template name
 	ConfigFilePath   envVariable = "CONFIG_FILE"        // path to the config file
+	DefaultErrorPage envVariable = "DEFAULT_ERROR_PAGE" // default error page (code)
+	DefaultHTTPCode  envVariable = "DEFAULT_HTTP_CODE"  // default HTTP response code
+	ShowDetails      envVariable = "SHOW_DETAILS"       // show request details in response
+	ProxyHTTPHeaders envVariable = "PROXY_HTTP_HEADERS" // proxy HTTP request headers list (request -> response)
 )
 
 // String returns environment variable name in the string representation.

internal/env/env_test.go

@@ -12,6 +12,10 @@ func TestConstants(t *testing.T) {
 	assert.Equal(t, "LISTEN_PORT", string(ListenPort))
 	assert.Equal(t, "TEMPLATE_NAME", string(TemplateName))
 	assert.Equal(t, "CONFIG_FILE", string(ConfigFilePath))
+	assert.Equal(t, "DEFAULT_ERROR_PAGE", string(DefaultErrorPage))
+	assert.Equal(t, "DEFAULT_HTTP_CODE", string(DefaultHTTPCode))
+	assert.Equal(t, "SHOW_DETAILS", string(ShowDetails))
+	assert.Equal(t, "PROXY_HTTP_HEADERS", string(ProxyHTTPHeaders))
 }
 
 func TestEnvVariable_Lookup(t *testing.T) {
@@ -22,6 +26,10 @@ func TestEnvVariable_Lookup(t *testing.T) {
 		{giveEnv: ListenPort},
 		{giveEnv: TemplateName},
 		{giveEnv: ConfigFilePath},
+		{giveEnv: DefaultErrorPage},
+		{giveEnv: DefaultHTTPCode},
+		{giveEnv: ShowDetails},
+		{giveEnv: ProxyHTTPHeaders},
 	}
 
 	for _, tt := range cases {

internal/http/common/handlers.go

@@ -1,35 +0,0 @@
-package common
-
-import (
-	"strings"
-
-	"github.com/valyala/fasthttp"
-)
-
-const internalErrorPattern = `<!DOCTYPE html>
-<html lang="en">
-<head>
-    <meta charset="utf-8">
-    <meta name="viewport" content="width=device-width, initial-scale=1">
-    <meta name="robots" content="noindex, nofollow" />
-    <title>Internal error occurred</title>
-    <style>
-        html,body {background-color: #0e0e0e;color:#fff;font-family:'Nunito',sans-serif;height:100%;margin:0}
-        .message {height:100%;align-items:center;display:flex;justify-content:center;position:relative;font-size:1.4em}
-        img {padding-right: .4em}
-    </style>
-</head>
-<body>
-<div class="message">
-    <img src="https://hsto.org/webt/fs/sx/gt/fssxgtssfg689qxboqvjil5yz8g.png" alt="logo" height="32">
-    <p>{{ message }}</p>
-</div>
-</body>
-</html>`
-
-func HandleInternalHTTPError(ctx *fasthttp.RequestCtx, statusCode int, message string) {
-	ctx.SetStatusCode(statusCode)
-	ctx.SetContentType("text/html; charset=UTF-8")
-
-	_, _ = ctx.WriteString(strings.ReplaceAll(internalErrorPattern, "{{ message }}", message))
-}

internal/http/common/middlewares.go

@@ -9,25 +9,60 @@ import (
 )
 
 func LogRequest(h fasthttp.RequestHandler, log *zap.Logger) fasthttp.RequestHandler {
+	const headersSeparator = ": "
+
 	return func(ctx *fasthttp.RequestCtx) {
-		var (
-			startedAt = time.Now()
-			ua        = string(ctx.UserAgent())
-		)
+		var ua = string(ctx.UserAgent())
+
+		if strings.Contains(strings.ToLower(ua), "healthcheck") { // skip healthcheck requests logging
+			h(ctx)
+
+			return
+		}
+
+		var reqHeaders = make([]string, 0, 24) //nolint:gomnd
+
+		ctx.Request.Header.VisitAll(func(key, value []byte) {
+			reqHeaders = append(reqHeaders, string(key)+headersSeparator+string(value))
+		})
+
+		var startedAt = time.Now()
 
 		h(ctx)
 
-		if strings.Contains(strings.ToLower(ua), "healthcheck") { // skip healthcheck requests logging
-			return
-		}
+		var respHeaders = make([]string, 0, 16) //nolint:gomnd
+
+		ctx.Response.Header.VisitAll(func(key, value []byte) {
+			respHeaders = append(respHeaders, string(key)+headersSeparator+string(value))
+		})
 
 		log.Info("HTTP request processed",
 			zap.String("useragent", ua),
 			zap.String("method", string(ctx.Method())),
 			zap.String("url", string(ctx.RequestURI())),
+			zap.String("referer", string(ctx.Referer())),
 			zap.Int("status_code", ctx.Response.StatusCode()),
+			zap.String("content_type", string(ctx.Response.Header.ContentType())),
 			zap.Bool("connection_close", ctx.Response.ConnectionClose()),
 			zap.Duration("duration", time.Since(startedAt)),
+			zap.Strings("request_headers", reqHeaders),
+			zap.Strings("response_headers", respHeaders),
 		)
 	}
 }
+
+type metrics interface {
+	IncrementTotalRequests()
+	ObserveRequestDuration(t time.Duration)
+}
+
+func DurationMetrics(h fasthttp.RequestHandler, m metrics) fasthttp.RequestHandler {
+	return func(ctx *fasthttp.RequestCtx) {
+		var startedAt = time.Now()
+
+		h(ctx)
+
+		m.IncrementTotalRequests()
+		m.ObserveRequestDuration(time.Since(startedAt))
+	}
+}

internal/http/core/errorpage.go

@@ -0,0 +1,122 @@
+package core
+
+import (
+	"strconv"
+
+	"github.com/tarampampam/error-pages/internal/config"
+	"github.com/tarampampam/error-pages/internal/tpl"
+	"github.com/valyala/fasthttp"
+)
+
+type templatePicker interface {
+	// Pick the template name for responding.
+	Pick() string
+}
+
+type renderer interface {
+	Render(content []byte, props tpl.Properties) ([]byte, error)
+}
+
+func RespondWithErrorPage( //nolint:funlen,gocyclo
+	ctx *fasthttp.RequestCtx,
+	cfg *config.Config,
+	p templatePicker,
+	rdr renderer,
+	pageCode string,
+	httpCode int,
+	showRequestDetails bool,
+	proxyHeaders []string,
+) {
+	ctx.Response.Header.Set("X-Robots-Tag", "noindex") // block Search indexing
+
+	var (
+		clientWant    = ClientWantFormat(ctx)
+		json, canJSON = cfg.JSONFormat()
+		xml, canXML   = cfg.XMLFormat()
+		props         = tpl.Properties{Code: pageCode, ShowRequestDetails: showRequestDetails}
+	)
+
+	if showRequestDetails {
+		props.OriginalURI = string(ctx.Request.Header.Peek(OriginalURI))
+		props.Namespace = string(ctx.Request.Header.Peek(Namespace))
+		props.IngressName = string(ctx.Request.Header.Peek(IngressName))
+		props.ServiceName = string(ctx.Request.Header.Peek(ServiceName))
+		props.ServicePort = string(ctx.Request.Header.Peek(ServicePort))
+		props.RequestID = string(ctx.Request.Header.Peek(RequestID))
+		props.ForwardedFor = string(ctx.Request.Header.Peek(ForwardedFor))
+		props.Host = string(ctx.Request.Header.Peek(Host))
+	}
+
+	if page, exists := cfg.Pages[pageCode]; exists {
+		props.Message = page.Message()
+		props.Description = page.Description()
+	} else if c, err := strconv.Atoi(pageCode); err == nil {
+		if s := fasthttp.StatusMessage(c); s != "Unknown Status Code" { // as a fallback
+			props.Message = s
+		}
+	}
+
+	SetClientFormat(ctx, PlainTextContentType) // set default content type
+
+	if props.Message == "" {
+		ctx.SetStatusCode(fasthttp.StatusNotFound)
+		_, _ = ctx.WriteString("requested pageCode (" + pageCode + ") not available")
+
+		return
+	}
+
+	// proxy required HTTP headers from the request to the response
+	for _, headerToProxy := range proxyHeaders {
+		if reqHeader := ctx.Request.Header.Peek(headerToProxy); len(reqHeader) > 0 {
+			ctx.Response.Header.SetBytesV(headerToProxy, reqHeader)
+		}
+	}
+
+	switch {
+	case clientWant == JSONContentType && canJSON: // JSON
+		{
+			SetClientFormat(ctx, JSONContentType)
+
+			if content, err := rdr.Render(json.Content(), props); err == nil {
+				ctx.SetStatusCode(httpCode)
+				_, _ = ctx.Write(content)
+			} else {
+				ctx.SetStatusCode(fasthttp.StatusInternalServerError)
+				_, _ = ctx.WriteString("cannot render JSON template: " + err.Error())
+			}
+		}
+
+	case clientWant == XMLContentType && canXML: // XML
+		{
+			SetClientFormat(ctx, XMLContentType)
+
+			if content, err := rdr.Render(xml.Content(), props); err == nil {
+				ctx.SetStatusCode(httpCode)
+				_, _ = ctx.Write(content)
+			} else {
+				ctx.SetStatusCode(fasthttp.StatusInternalServerError)
+				_, _ = ctx.WriteString("cannot render XML template: " + err.Error())
+			}
+		}
+
+	default: // HTML
+		{
+			SetClientFormat(ctx, HTMLContentType)
+
+			var templateName = p.Pick()
+
+			if template, exists := cfg.Template(templateName); exists {
+				if content, err := rdr.Render(template.Content(), props); err == nil {
+					ctx.SetStatusCode(httpCode)
+					_, _ = ctx.Write(content)
+				} else {
+					ctx.SetStatusCode(fasthttp.StatusInternalServerError)
+					_, _ = ctx.WriteString("cannot render HTML template: " + err.Error())
+				}
+			} else {
+				ctx.SetStatusCode(fasthttp.StatusInternalServerError)
+				_, _ = ctx.WriteString("template " + templateName + " not exists")
+			}
+		}
+	}
+}

internal/http/core/formats.go

@@ -0,0 +1,102 @@
+package core
+
+import (
+	"bytes"
+	"sort"
+	"strconv"
+
+	"github.com/valyala/fasthttp"
+)
+
+type ContentType = byte
+
+const (
+	UnknownContentType ContentType = iota // should be first
+	JSONContentType
+	XMLContentType
+	HTMLContentType
+	PlainTextContentType
+)
+
+func ClientWantFormat(ctx *fasthttp.RequestCtx) ContentType {
+	// parse "Content-Type" header (e.g.: `application/json;charset=UTF-8`)
+	if ct := bytes.ToLower(ctx.Request.Header.ContentType()); len(ct) > 4 { //nolint:gomnd
+		return mimeTypeToContentType(ct)
+	}
+
+	// parse `X-Format` header (aka `Accept`) for the Ingress support
+	// e.g.: `text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8`
+	if h := bytes.ToLower(bytes.TrimSpace(ctx.Request.Header.Peek(FormatHeader))); len(h) > 2 { //nolint:gomnd,nestif
+		type format struct {
+			mimeType []byte
+			weight   float32
+		}
+
+		var formats = make([]format, 0, 8) //nolint:gomnd
+
+		for _, b := range bytes.FieldsFunc(h, func(r rune) bool { return r == ',' }) {
+			if idx := bytes.Index(b, []byte(";q=")); idx > 0 && idx < len(b) {
+				f := format{b[0:idx], 0}
+
+				if len(b) > idx+3 {
+					if weight, err := strconv.ParseFloat(string(b[idx+3:]), 32); err == nil { //nolint:gomnd
+						f.weight = float32(weight)
+					}
+				}
+
+				formats = append(formats, f)
+			} else {
+				formats = append(formats, format{b, 1})
+			}
+		}
+
+		switch l := len(formats); {
+		case l == 0:
+			return UnknownContentType
+
+		case l == 1:
+			return mimeTypeToContentType(formats[0].mimeType)
+
+		default:
+			sort.SliceStable(formats, func(i, j int) bool { return formats[i].weight > formats[j].weight })
+
+			return mimeTypeToContentType(formats[0].mimeType)
+		}
+	}
+
+	return UnknownContentType
+}
+
+func mimeTypeToContentType(mimeType []byte) ContentType {
+	switch {
+	case bytes.Contains(mimeType, []byte("application/json")), bytes.Contains(mimeType, []byte("text/json")):
+		return JSONContentType
+
+	case bytes.Contains(mimeType, []byte("application/xml")), bytes.Contains(mimeType, []byte("text/xml")):
+		return XMLContentType
+
+	case bytes.Contains(mimeType, []byte("text/html")):
+		return HTMLContentType
+
+	case bytes.Contains(mimeType, []byte("text/plain")):
+		return PlainTextContentType
+	}
+
+	return UnknownContentType
+}
+
+func SetClientFormat(ctx *fasthttp.RequestCtx, t ContentType) {
+	switch t {
+	case JSONContentType:
+		ctx.SetContentType("application/json; charset=utf-8")
+
+	case XMLContentType:
+		ctx.SetContentType("application/xml; charset=utf-8")
+
+	case HTMLContentType:
+		ctx.SetContentType("text/html; charset=utf-8")
+
+	case PlainTextContentType:
+		ctx.SetContentType("text/plain; charset=utf-8")
+	}
+}

internal/http/core/formats_test.go

@@ -0,0 +1,117 @@
+package core_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/tarampampam/error-pages/internal/http/core"
+	"github.com/valyala/fasthttp"
+)
+
+func TestClientWantFormat(t *testing.T) {
+	for name, tt := range map[string]struct {
+		giveContentTypeHeader string
+		giveFormatHeader      string
+		giveReqCtx            func() *fasthttp.RequestCtx
+		wantFormat            core.ContentType
+	}{
+		"priority": {
+			giveFormatHeader:      "application/xml",
+			giveContentTypeHeader: "text/plain",
+			wantFormat:            core.PlainTextContentType,
+		},
+		"format respects weight": {
+			giveFormatHeader: "text/html;q=0.5,application/xhtml+xml;q=0.9,application/xml;q=1,*/*;q=0.8",
+			wantFormat:       core.XMLContentType,
+		},
+		"wrong format value": {
+			giveFormatHeader: ";q=foobar,bar/baz;;;;;application/xml",
+			wantFormat:       core.UnknownContentType,
+		},
+
+		"content type - application/json": {
+			giveContentTypeHeader: "application/jsoN; charset=utf-8", wantFormat: core.JSONContentType,
+		},
+		"content type - text/json": {
+			giveContentTypeHeader: "text/Json; charset=utf-8", wantFormat: core.JSONContentType,
+		},
+		"format - json": {
+			giveFormatHeader: "application/jsoN,*/*;q=0.8", wantFormat: core.JSONContentType,
+		},
+
+		"content type - application/xml": {
+			giveContentTypeHeader: "application/xmL; charset=utf-8", wantFormat: core.XMLContentType,
+		},
+		"content type - text/xml": {
+			giveContentTypeHeader: "text/Xml; charset=utf-8", wantFormat: core.XMLContentType,
+		},
+		"format - xml": {
+			giveFormatHeader: "text/Xml", wantFormat: core.XMLContentType,
+		},
+
+		"content type - text/html": {
+			giveContentTypeHeader: "text/htMl; charset=utf-8", wantFormat: core.HTMLContentType,
+		},
+		"format - html": {
+			giveFormatHeader: "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8",
+			wantFormat:       core.HTMLContentType,
+		},
+
+		"content type - text/plain": {
+			giveContentTypeHeader: "text/plaiN; charset=utf-8", wantFormat: core.PlainTextContentType,
+		},
+		"format - plain": {
+			giveFormatHeader: "text/plaiN,text/html,application/xml;q=0.9,,,*/*;q=0.8", wantFormat: core.PlainTextContentType,
+		},
+
+		"unknown on empty": {
+			wantFormat: core.UnknownContentType,
+		},
+		"unknown on foo/bar": {
+			giveContentTypeHeader: "foo/bar; charset=utf-8",
+			giveFormatHeader:      "foo/bar; charset=utf-8",
+			wantFormat:            core.UnknownContentType,
+		},
+	} {
+		t.Run(name, func(t *testing.T) {
+			h := &fasthttp.RequestHeader{}
+			h.Set(fasthttp.HeaderContentType, tt.giveContentTypeHeader)
+			h.Set(core.FormatHeader, tt.giveFormatHeader)
+
+			ctx := &fasthttp.RequestCtx{
+				Request: fasthttp.Request{
+					Header: *h, //nolint:govet
+				},
+			}
+
+			assert.Equal(t, tt.wantFormat, core.ClientWantFormat(ctx))
+		})
+	}
+}
+
+func TestSetClientFormat(t *testing.T) {
+	for name, tt := range map[string]struct {
+		giveContentType core.ContentType
+		wantHeaderValue string
+	}{
+		"plain on unknown": {giveContentType: core.UnknownContentType, wantHeaderValue: "text/plain; charset=utf-8"},
+		"json":             {giveContentType: core.JSONContentType, wantHeaderValue: "application/json; charset=utf-8"},
+		"xml":              {giveContentType: core.XMLContentType, wantHeaderValue: "application/xml; charset=utf-8"},
+		"html":             {giveContentType: core.HTMLContentType, wantHeaderValue: "text/html; charset=utf-8"},
+		"plain":            {giveContentType: core.PlainTextContentType, wantHeaderValue: "text/plain; charset=utf-8"},
+	} {
+		t.Run(name, func(t *testing.T) {
+			ctx := &fasthttp.RequestCtx{
+				Response: fasthttp.Response{
+					Header: fasthttp.ResponseHeader{},
+				},
+			}
+
+			assert.Empty(t, "", ctx.Response.Header.Peek(fasthttp.HeaderContentType))
+
+			core.SetClientFormat(ctx, tt.giveContentType)
+
+			assert.Equal(t, tt.wantHeaderValue, string(ctx.Response.Header.Peek(fasthttp.HeaderContentType)))
+		})
+	}
+}

internal/http/core/headers.go

@@ -0,0 +1,33 @@
+package core
+
+const (
+	// FormatHeader name of the header used to extract the format
+	FormatHeader = "X-Format"
+
+	// CodeHeader name of the header used as source of the HTTP status code to return
+	CodeHeader = "X-Code"
+
+	// OriginalURI name of the header with the original URL from NGINX
+	OriginalURI = "X-Original-URI"
+
+	// Namespace name of the header that contains information about the Ingress namespace
+	Namespace = "X-Namespace"
+
+	// IngressName name of the header that contains the matched Ingress
+	IngressName = "X-Ingress-Name"
+
+	// ServiceName name of the header that contains the matched Service in the Ingress
+	ServiceName = "X-Service-Name"
+
+	// ServicePort name of the header that contains the matched Service port in the Ingress
+	ServicePort = "X-Service-Port"
+
+	// RequestID is a unique ID that identifies the request - same as for backend service
+	RequestID = "X-Request-ID"
+
+	// ForwardedFor identifies the user of this session
+	ForwardedFor = "X-Forwarded-For"
+
+	// Host identifies the hosts origin
+	Host = "Host"
+)

internal/http/handlers/errorpage/handler.go

@@ -1,85 +1,39 @@
 package errorpage
 
 import (
-	"math/rand"
-	"sort"
-	"time"
-
-	"github.com/pkg/errors"
-	"github.com/tarampampam/error-pages/internal/http/common"
+	"github.com/tarampampam/error-pages/internal/config"
+	"github.com/tarampampam/error-pages/internal/http/core"
 	"github.com/tarampampam/error-pages/internal/tpl"
 	"github.com/valyala/fasthttp"
 )
 
-const (
-	UseRandom              = "random"
-	UseRandomOnEachRequest = "i-said-random"
+type (
+	templatePicker interface {
+		// Pick the template name for responding.
+		Pick() string
+	}
+
+	renderer interface {
+		Render(content []byte, props tpl.Properties) ([]byte, error)
+	}
 )
 
 // NewHandler creates handler for error pages serving.
 func NewHandler(
-	templateName string,
-	templates map[string][]byte,
-	codes map[string]tpl.Annotator,
-) (fasthttp.RequestHandler, error) {
-	if len(templates) == 0 {
-		return nil, errors.New("empty templates map")
-	}
-
-	var (
-		rnd           = rand.New(rand.NewSource(time.Now().UnixNano())) //nolint:gosec
-		templateNames = templateTames(templates)
-	)
-
-	if templateName == "" { // on empty template name
-		templateName = templateNames[0] // pick the first
-	} else if templateName == UseRandom { // on "random" template name
-		templateName = templateNames[rnd.Intn(len(templateNames))] // pick the randomized
-	}
-
-	if _, found := templates[templateName]; !found && templateName != UseRandomOnEachRequest {
-		return nil, errors.New("wrong template name passed")
-	}
-
-	var pages = tpl.NewErrors(templates, codes)
-
+	cfg *config.Config,
+	p templatePicker,
+	rdr renderer,
+	showRequestDetails bool,
+	proxyHTTPHeaders []string,
+) fasthttp.RequestHandler {
 	return func(ctx *fasthttp.RequestCtx) {
-		var useTemplate = templateName // default
-
-		if templateName == UseRandomOnEachRequest {
-			useTemplate = templateNames[rnd.Intn(len(templateNames))] // pick the randomized
-		}
+		core.SetClientFormat(ctx, core.PlainTextContentType) // default content type
 
 		if code, ok := ctx.UserValue("code").(string); ok {
-			if content, err := pages.Get(useTemplate, code); err == nil {
-				ctx.SetStatusCode(fasthttp.StatusOK)
-				ctx.SetContentType("text/html; charset=utf-8")
-				_, _ = ctx.Write(content)
-			} else {
-				common.HandleInternalHTTPError(
-					ctx,
-					fasthttp.StatusNotFound,
-					"requested code not available: "+err.Error(),
-				)
+			core.RespondWithErrorPage(ctx, cfg, p, rdr, code, fasthttp.StatusOK, showRequestDetails, proxyHTTPHeaders)
+		} else { // will never occur
+			ctx.SetStatusCode(fasthttp.StatusInternalServerError)
+			_, _ = ctx.WriteString("cannot extract requested code from the request")
 		}
-		} else { // will never happen
-			common.HandleInternalHTTPError(
-				ctx,
-				fasthttp.StatusInternalServerError,
-				"cannot extract requested code from the request",
-			)
 	}
-	}, nil
-}
-
-func templateTames(templates map[string][]byte) []string {
-	var templateNames = make([]string, 0, len(templates))
-
-	for name := range templates {
-		templateNames = append(templateNames, name)
-	}
-
-	sort.Strings(templateNames)
-
-	return templateNames
 }

internal/http/handlers/healthz/handler.go

@@ -19,5 +19,6 @@ func NewHandler(checker checker) fasthttp.RequestHandler {
 		}
 
 		ctx.SetStatusCode(fasthttp.StatusOK)
+		_, _ = ctx.WriteString("OK")
 	}
 }

internal/http/handlers/index/handler.go

@@ -0,0 +1,56 @@
+package index
+
+import (
+	"strconv"
+
+	"github.com/tarampampam/error-pages/internal/config"
+	"github.com/tarampampam/error-pages/internal/http/core"
+	"github.com/tarampampam/error-pages/internal/tpl"
+	"github.com/valyala/fasthttp"
+)
+
+type (
+	templatePicker interface {
+		// Pick the template name for responding.
+		Pick() string
+	}
+
+	renderer interface {
+		Render(content []byte, props tpl.Properties) ([]byte, error)
+	}
+)
+
+// NewHandler creates handler for the index page serving.
+func NewHandler(
+	cfg *config.Config,
+	p templatePicker,
+	rdr renderer,
+	defaultPageCode string,
+	defaultHTTPCode uint16,
+	showRequestDetails bool,
+	proxyHTTPHeaders []string,
+) fasthttp.RequestHandler {
+	return func(ctx *fasthttp.RequestCtx) {
+		pageCode, httpCode := defaultPageCode, int(defaultHTTPCode)
+
+		if returnCode, ok := extractCodeToReturn(ctx); ok {
+			pageCode, httpCode = strconv.Itoa(returnCode), returnCode
+		}
+
+		core.RespondWithErrorPage(ctx, cfg, p, rdr, pageCode, httpCode, showRequestDetails, proxyHTTPHeaders)
+	}
+}
+
+func extractCodeToReturn(ctx *fasthttp.RequestCtx) (int, bool) { // for the Ingress support
+	var ch = ctx.Request.Header.Peek(core.CodeHeader)
+
+	if len(ch) > 0 && len(ch) <= 3 {
+		if code, err := strconv.Atoi(string(ch)); err == nil {
+			if code > 0 && code <= 599 {
+				return code, true
+			}
+		}
+	}
+
+	return 0, false
+}

internal/http/handlers/index/handler_test.go

@@ -1,4 +1,4 @@
-package common_test
+package index_test
 
 import "testing"
 

internal/http/handlers/metrics/handler.go

@@ -0,0 +1,16 @@
+// Package metrics contains HTTP handler for application metrics (prometheus format) generation.
+package metrics
+
+import (
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+	"github.com/valyala/fasthttp"
+	"github.com/valyala/fasthttp/fasthttpadaptor"
+)
+
+// NewHandler creates metrics handler.
+func NewHandler(registry prometheus.Gatherer) fasthttp.RequestHandler {
+	return fasthttpadaptor.NewFastHTTPHandler(
+		promhttp.HandlerFor(registry, promhttp.HandlerOpts{ErrorHandling: promhttp.ContinueOnError}),
+	)
+}

internal/http/handlers/metrics/handler_test.go

@@ -0,0 +1,7 @@
+package metrics_test
+
+import "testing"
+
+func TestNothing(t *testing.T) {
+	t.Skip("tests for this package have not been implemented yet")
+}

internal/http/handlers/notfound/handler.go

@@ -0,0 +1,14 @@
+package notfound
+
+import (
+	"github.com/valyala/fasthttp"
+)
+
+// NewHandler creates handler missing requests handling.
+func NewHandler() fasthttp.RequestHandler {
+	return func(ctx *fasthttp.RequestCtx) {
+		ctx.SetContentType("text/plain; charset=utf-8")
+		ctx.SetStatusCode(fasthttp.StatusNotFound)
+		_, _ = ctx.WriteString("Wrong request URL. Error pages are available at the following URLs: /{code}.html")
+	}
+}

internal/http/handlers/notfound/handler_test.go

@@ -0,0 +1,7 @@
+package notfound_test
+
+import "testing"
+
+func TestNothing(t *testing.T) {
+	t.Skip("tests for this package have not been implemented yet")
+}

internal/http/server.go

@@ -1,16 +1,20 @@
 package http
 
 import (
-	"context"
 	"strconv"
 	"time"
 
 	"github.com/fasthttp/router"
 	"github.com/tarampampam/error-pages/internal/checkers"
+	"github.com/tarampampam/error-pages/internal/config"
 	"github.com/tarampampam/error-pages/internal/http/common"
 	errorpageHandler "github.com/tarampampam/error-pages/internal/http/handlers/errorpage"
 	healthzHandler "github.com/tarampampam/error-pages/internal/http/handlers/healthz"
+	indexHandler "github.com/tarampampam/error-pages/internal/http/handlers/index"
+	metricsHandler "github.com/tarampampam/error-pages/internal/http/handlers/metrics"
+	notfoundHandler "github.com/tarampampam/error-pages/internal/http/handlers/notfound"
 	versionHandler "github.com/tarampampam/error-pages/internal/http/handlers/version"
+	"github.com/tarampampam/error-pages/internal/metrics"
 	"github.com/tarampampam/error-pages/internal/tpl"
 	"github.com/tarampampam/error-pages/internal/version"
 	"github.com/valyala/fasthttp"
@@ -18,18 +22,20 @@ import (
 )
 
 type Server struct {
+	log    *zap.Logger
 	fast   *fasthttp.Server
 	router *router.Router
+	rdr    *tpl.TemplateRenderer
 }
 
 const (
-	defaultWriteTimeout = time.Second * 7
-	defaultReadTimeout  = time.Second * 7
-	defaultIdleTimeout  = time.Second * 15
+	defaultWriteTimeout = time.Second * 4
+	defaultReadTimeout  = time.Second * 4
+	defaultIdleTimeout  = time.Second * 6
 )
 
 func NewServer(log *zap.Logger) Server {
-	r := router.New()
+	rdr := tpl.NewTemplateRenderer()
 
 	return Server{
 		// fasthttp docs: <https://github.com/valyala/fasthttp>
@@ -37,13 +43,14 @@ func NewServer(log *zap.Logger) Server {
 			WriteTimeout:          defaultWriteTimeout,
 			ReadTimeout:           defaultReadTimeout,
 			IdleTimeout:           defaultIdleTimeout,
-			Handler:               common.LogRequest(r.Handler, log),
 			NoDefaultServerHeader: true,
 			ReduceMemoryUsage:     true,
 			CloseOnShutdown:       true,
 			Logger:                zap.NewStdLog(log),
 		},
-		router: r,
+		router: router.New(),
+		log:    log,
+		rdr:    rdr,
 	}
 }
 
@@ -52,55 +59,51 @@ func (s *Server) Start(ip string, port uint16) error {
 	return s.fast.ListenAndServe(ip + ":" + strconv.Itoa(int(port)))
 }
 
+type templatePicker interface {
+	// Pick the template name for responding.
+	Pick() string
+}
+
 // Register server routes, middlewares, etc.
 // Router docs: <https://github.com/fasthttp/router>
 func (s *Server) Register(
-	templateName string,
-	templates map[string][]byte,
-	codes map[string]tpl.Annotator,
+	cfg *config.Config,
+	templatePicker templatePicker,
+	defaultPageCode string,
+	defaultHTTPCode uint16,
+	showDetails bool,
+	proxyHTTPHeaders []string,
 ) error {
-	s.router.GET("/", func(ctx *fasthttp.RequestCtx) {
-		common.HandleInternalHTTPError(
-			ctx,
-			fasthttp.StatusNotFound,
-			"Hi there! Error pages are available at the following URLs: /{code}.html",
-		)
-	})
+	reg, m := metrics.NewRegistry(), metrics.NewMetrics()
 
-	s.router.NotFound = func(ctx *fasthttp.RequestCtx) {
-		common.HandleInternalHTTPError(
-			ctx,
-			fasthttp.StatusNotFound,
-			"Wrong request URL. Error pages are available at the following URLs: /{code}.html",
-		)
-	}
-
-	s.router.GET("/version", versionHandler.NewHandler(version.Version()))
-	s.router.ANY("/health/live", healthzHandler.NewHandler(checkers.NewLiveChecker()))
-
-	if h, err := errorpageHandler.NewHandler(templateName, templates, codes); err != nil {
+	if err := m.Register(reg); err != nil {
 		return err
-	} else {
-		s.router.GET("/{code}.html", h)
 	}
 
+	s.fast.Handler = common.DurationMetrics(common.LogRequest(s.router.Handler, s.log), &m)
+
+	s.router.GET("/", indexHandler.NewHandler(cfg, templatePicker, s.rdr, defaultPageCode, defaultHTTPCode, showDetails, proxyHTTPHeaders)) //nolint:lll
+	s.router.GET("/{code}.html", errorpageHandler.NewHandler(cfg, templatePicker, s.rdr, showDetails, proxyHTTPHeaders))                    //nolint:lll
+	s.router.GET("/version", versionHandler.NewHandler(version.Version()))
+
+	liveHandler := healthzHandler.NewHandler(checkers.NewLiveChecker())
+	s.router.ANY("/healthz", liveHandler)
+	s.router.ANY("/health/live", liveHandler) // deprecated
+
+	s.router.GET("/metrics", metricsHandler.NewHandler(reg))
+
+	s.router.NotFound = notfoundHandler.NewHandler()
+
 	return nil
 }
 
 // Stop server.
-func (s *Server) Stop(timeout time.Duration) error {
-	ctx, cancel := context.WithTimeout(context.Background(), timeout) // TODO replace with simple time.After
-	defer cancel()
+func (s *Server) Stop() error {
+	if err := s.rdr.Close(); err != nil {
+		defer func() { _ = s.fast.Shutdown() }()
 
-	ch := make(chan error, 1) // channel for server stopping error
-
-	go func() { defer close(ch); ch <- s.fast.Shutdown() }()
-
-	select {
-	case err := <-ch:
 		return err
+	}
 
-	case <-ctx.Done():
-		return ctx.Err()
-	}
+	return s.fast.Shutdown()
 }

internal/metrics/metrics.go

@@ -0,0 +1,52 @@
+package metrics
+
+import (
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
+)
+
+type Metrics struct {
+	total    prometheus.Counter
+	duration prometheus.Histogram
+}
+
+// NewMetrics creates new Metrics collector.
+func NewMetrics() Metrics {
+	const namespace, subsystem = "http", "requests"
+
+	return Metrics{
+		total: prometheus.NewCounter(prometheus.CounterOpts{
+			Namespace: namespace,
+			Subsystem: subsystem,
+			Name:      "total_count",
+			Help:      "Counter of HTTP requests made.",
+		}),
+		duration: prometheus.NewHistogram(prometheus.HistogramOpts{
+			Namespace: namespace,
+			Subsystem: subsystem,
+			Name:      "duration_milliseconds",
+			Help:      "Histogram of the time (in milliseconds) each request took.",
+			Buckets:   append([]float64{.001, .003}, prometheus.DefBuckets...),
+		}),
+	}
+}
+
+// IncrementTotalRequests increments total requests counter.
+func (w *Metrics) IncrementTotalRequests() { w.total.Inc() }
+
+// ObserveRequestDuration observer requests duration histogram.
+func (w *Metrics) ObserveRequestDuration(t time.Duration) { w.duration.Observe(t.Seconds()) }
+
+// Register metrics with registerer.
+func (w *Metrics) Register(reg prometheus.Registerer) error {
+	if err := reg.Register(w.total); err != nil {
+		return err
+	}
+
+	if err := reg.Register(w.duration); err != nil {
+		return err
+	}
+
+	return nil
+}

internal/metrics/metrics_test.go

@@ -0,0 +1,70 @@
+package metrics_test
+
+import (
+	"testing"
+	"time"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/testutil"
+	dto "github.com/prometheus/client_model/go"
+	"github.com/stretchr/testify/assert"
+	"github.com/tarampampam/error-pages/internal/metrics"
+)
+
+func TestMetrics_Register(t *testing.T) {
+	var (
+		registry = prometheus.NewRegistry()
+		m        = metrics.NewMetrics()
+	)
+
+	assert.NoError(t, m.Register(registry))
+
+	count, err := testutil.GatherAndCount(registry,
+		"http_requests_total_count",
+		"http_requests_duration_milliseconds",
+	)
+	assert.NoError(t, err)
+
+	assert.Equal(t, 2, count)
+}
+
+func TestMetrics_IncrementTotalRequests(t *testing.T) {
+	p := metrics.NewMetrics()
+
+	p.IncrementTotalRequests()
+
+	metric := getMetric(t, &p, "http_requests_total_count")
+	assert.Equal(t, float64(1), metric.Counter.GetValue())
+}
+
+func TestMetrics_ObserveRequestDuration(t *testing.T) {
+	p := metrics.NewMetrics()
+
+	p.ObserveRequestDuration(time.Second)
+
+	metric := getMetric(t, &p, "http_requests_duration_milliseconds")
+	assert.Equal(t, float64(1), metric.Histogram.GetSampleSum())
+}
+
+type registerer interface {
+	Register(prometheus.Registerer) error
+}
+
+func getMetric(t *testing.T, reg registerer, name string) *dto.Metric {
+	t.Helper()
+
+	registry := prometheus.NewRegistry()
+	_ = reg.Register(registry)
+
+	families, _ := registry.Gather()
+
+	for _, family := range families {
+		if family.GetName() == name {
+			return family.Metric[0]
+		}
+	}
+
+	assert.FailNowf(t, "cannot resolve metric for: %s", name)
+
+	return nil
+}

internal/metrics/registry.go

@@ -0,0 +1,20 @@
+// Package metrics contains custom prometheus metrics and registry factories.
+package metrics
+
+import (
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/collectors"
+)
+
+// NewRegistry creates new prometheus registry with pre-registered common collectors.
+func NewRegistry() *prometheus.Registry {
+	registry := prometheus.NewRegistry()
+
+	// register common metric collectors
+	registry.MustRegister(
+		// collectors.NewGoCollector(),
+		collectors.NewProcessCollector(collectors.ProcessCollectorOpts{}),
+	)
+
+	return registry
+}

internal/metrics/registry_test.go

@@ -0,0 +1,18 @@
+package metrics_test
+
+import (
+	"testing"
+
+	"github.com/prometheus/client_golang/prometheus/testutil"
+	"github.com/stretchr/testify/assert"
+	"github.com/tarampampam/error-pages/internal/metrics"
+)
+
+func TestNewRegistry(t *testing.T) {
+	registry := metrics.NewRegistry()
+
+	count, err := testutil.GatherAndCount(registry)
+
+	assert.NoError(t, err)
+	assert.True(t, count >= 6, "not enough common metrics")
+}

internal/pick/picker.go

@@ -0,0 +1,88 @@
+package pick
+
+import (
+	"math/rand"
+	"sync"
+	"time"
+)
+
+type pickMode = byte
+
+const (
+	First           pickMode = 1 + iota // Always pick the first element (index = 0)
+	RandomOnce                          // Pick random element once (any future Pick calls will return the same element)
+	RandomEveryTime                     // Always Pick the random element
+)
+
+type picker struct {
+	mode   pickMode
+	rand   *rand.Rand // will be nil for the First pick mode
+	maxIdx uint32
+
+	mu      sync.Mutex
+	lastIdx uint32
+}
+
+const unsetIdx uint32 = 4294967295
+
+func NewPicker(maxIdx uint32, mode pickMode) *picker {
+	var p = &picker{
+		maxIdx:  maxIdx,
+		mode:    mode,
+		lastIdx: unsetIdx,
+	}
+
+	if mode != First {
+		p.rand = rand.New(rand.NewSource(time.Now().UnixNano())) //nolint:gosec
+	}
+
+	return p
+}
+
+// NextIndex returns an index for the next element (based on pickMode).
+func (p *picker) NextIndex() uint32 {
+	if p.maxIdx == 0 {
+		return 0
+	}
+
+	switch p.mode {
+	case First:
+		return 0
+
+	case RandomOnce:
+		if p.lastIdx == unsetIdx {
+			return p.randomizeNext()
+		}
+
+		return p.lastIdx
+
+	case RandomEveryTime:
+		return p.randomizeNext()
+
+	default:
+		panic("picker.NextIndex(): unsupported mode")
+	}
+}
+
+func (p *picker) randomizeNext() uint32 {
+	var idx = uint32(p.rand.Intn(int(p.maxIdx + 1)))
+
+	p.mu.Lock()
+	defer p.mu.Unlock()
+
+	if idx == p.lastIdx {
+		p.lastIdx++
+	} else {
+		p.lastIdx = idx
+	}
+
+	if p.lastIdx > p.maxIdx { // overflow?
+		p.lastIdx = 0
+	}
+
+	if p.lastIdx == unsetIdx {
+		p.lastIdx--
+	}
+
+	return p.lastIdx
+}

internal/pick/picker_test.go

@@ -0,0 +1,57 @@
+package pick_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/tarampampam/error-pages/internal/pick"
+)
+
+func TestPicker_NextIndex_First(t *testing.T) {
+	for i := uint32(0); i < 100; i++ {
+		p := pick.NewPicker(i, pick.First)
+
+		for j := uint8(0); j < 100; j++ {
+			assert.Equal(t, uint32(0), p.NextIndex())
+		}
+	}
+}
+
+func TestPicker_NextIndex_RandomOnce(t *testing.T) {
+	for i := uint8(0); i < 10; i++ {
+		assert.Equal(t, uint32(0), pick.NewPicker(0, pick.RandomOnce).NextIndex())
+	}
+
+	for i := uint8(10); i < 100; i++ {
+		p := pick.NewPicker(uint32(i), pick.RandomOnce)
+
+		next := p.NextIndex()
+		assert.LessOrEqual(t, next, uint32(i))
+
+		for j := uint8(0); j < 100; j++ {
+			assert.Equal(t, next, p.NextIndex())
+		}
+	}
+}
+
+func TestPicker_NextIndex_RandomEveryTime(t *testing.T) {
+	for i := uint8(0); i < 10; i++ {
+		assert.Equal(t, uint32(0), pick.NewPicker(0, pick.RandomEveryTime).NextIndex())
+	}
+
+	for i := uint8(1); i < 100; i++ {
+		p := pick.NewPicker(uint32(i), pick.RandomEveryTime)
+
+		for j := uint8(0); j < 100; j++ {
+			one, two := p.NextIndex(), p.NextIndex()
+
+			assert.LessOrEqual(t, one, uint32(i))
+			assert.LessOrEqual(t, two, uint32(i))
+			assert.NotEqual(t, one, two)
+		}
+	}
+}
+
+func TestPicker_NextIndex_Unsupported(t *testing.T) {
+	assert.Panics(t, func() { pick.NewPicker(1, 255).NextIndex() })
+}

internal/pick/strings_slice.go

@@ -0,0 +1,135 @@
+package pick
+
+import (
+	"errors"
+	"sync"
+	"time"
+)
+
+type StringsSlice struct {
+	s []string
+	p *picker
+}
+
+// NewStringsSlice creates new StringsSlice.
+func NewStringsSlice(items []string, mode pickMode) *StringsSlice {
+	maxIdx := len(items) - 1
+
+	if maxIdx < 0 {
+		maxIdx = 0
+	}
+
+	return &StringsSlice{s: items, p: NewPicker(uint32(maxIdx), mode)}
+}
+
+// Pick an element from the strings slice.
+func (s *StringsSlice) Pick() string {
+	if len(s.s) == 0 {
+		return ""
+	}
+
+	return s.s[s.p.NextIndex()]
+}
+
+type StringsSliceWithInterval struct {
+	s []string
+	p *picker
+	d time.Duration
+
+	idxMu sync.RWMutex
+	idx   uint32
+
+	close    chan struct{}
+	closedMu sync.RWMutex
+	closed   bool
+}
+
+// NewStringsSliceWithInterval creates new StringsSliceWithInterval.
+func NewStringsSliceWithInterval(items []string, mode pickMode, interval time.Duration) *StringsSliceWithInterval {
+	maxIdx := len(items) - 1
+
+	if maxIdx < 0 {
+		maxIdx = 0
+	}
+
+	if interval <= time.Duration(0) {
+		panic("NewStringsSliceWithInterval: wrong interval")
+	}
+
+	s := &StringsSliceWithInterval{
+		s:     items,
+		p:     NewPicker(uint32(maxIdx), mode),
+		d:     interval,
+		close: make(chan struct{}, 1),
+	}
+
+	s.next()
+
+	go s.rotate()
+
+	return s
+}
+
+func (s *StringsSliceWithInterval) rotate() {
+	defer close(s.close)
+
+	timer := time.NewTimer(s.d)
+	defer timer.Stop()
+
+	for {
+		select {
+		case <-s.close:
+			return
+
+		case <-timer.C:
+			s.next()
+			timer.Reset(s.d)
+		}
+	}
+}
+
+func (s *StringsSliceWithInterval) next() {
+	idx := s.p.NextIndex()
+
+	s.idxMu.Lock()
+	s.idx = idx
+	s.idxMu.Unlock()
+}
+
+// Pick an element from the strings slice.
+func (s *StringsSliceWithInterval) Pick() string {
+	if s.isClosed() {
+		panic("StringsSliceWithInterval.Pick(): closed")
+	}
+
+	if len(s.s) == 0 {
+		return ""
+	}
+
+	s.idxMu.RLock()
+	defer s.idxMu.RUnlock()
+
+	return s.s[s.idx]
+}
+
+func (s *StringsSliceWithInterval) isClosed() (closed bool) {
+	s.closedMu.RLock()
+	closed = s.closed
+	s.closedMu.RUnlock()
+
+	return
+}
+
+func (s *StringsSliceWithInterval) Close() error {
+	if s.isClosed() {
+		return errors.New("closed")
+	}
+
+	s.closedMu.Lock()
+	s.closed = true
+	s.closedMu.Unlock()
+
+	s.close <- struct{}{}
+
+	return nil
+}

internal/pick/strings_slice_test.go

@@ -0,0 +1,130 @@
+package pick_test
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/tarampampam/error-pages/internal/pick"
+)
+
+func TestStringsSlice_Pick(t *testing.T) {
+	t.Run("first", func(t *testing.T) {
+		for i := uint8(0); i < 100; i++ {
+			assert.Equal(t, "", pick.NewStringsSlice([]string{}, pick.First).Pick())
+		}
+
+		p := pick.NewStringsSlice([]string{"foo", "bar", "baz"}, pick.First)
+
+		for i := uint8(0); i < 100; i++ {
+			assert.Equal(t, "foo", p.Pick())
+		}
+	})
+
+	t.Run("random once", func(t *testing.T) {
+		for i := uint8(0); i < 100; i++ {
+			assert.Equal(t, "", pick.NewStringsSlice([]string{}, pick.RandomOnce).Pick())
+		}
+
+		var (
+			p      = pick.NewStringsSlice([]string{"foo", "bar", "baz"}, pick.RandomOnce)
+			picked = p.Pick()
+		)
+
+		for i := uint8(0); i < 100; i++ {
+			assert.Equal(t, picked, p.Pick())
+		}
+	})
+
+	t.Run("random every time", func(t *testing.T) {
+		for i := uint8(0); i < 100; i++ {
+			assert.Equal(t, "", pick.NewStringsSlice([]string{}, pick.RandomEveryTime).Pick())
+		}
+
+		for i := uint8(0); i < 100; i++ {
+			p := pick.NewStringsSlice([]string{"foo", "bar", "baz"}, pick.RandomEveryTime)
+
+			assert.NotEqual(t, p.Pick(), p.Pick())
+		}
+	})
+}
+
+func TestNewStringsSliceWithInterval_Pick(t *testing.T) {
+	t.Run("first", func(t *testing.T) {
+		for i := uint8(0); i < 50; i++ {
+			p := pick.NewStringsSliceWithInterval([]string{}, pick.First, time.Millisecond)
+			assert.Equal(t, "", p.Pick())
+			assert.NoError(t, p.Close())
+			assert.Panics(t, func() { p.Pick() })
+		}
+
+		p := pick.NewStringsSliceWithInterval([]string{"foo", "bar", "baz"}, pick.First, time.Millisecond)
+
+		for i := uint8(0); i < 50; i++ {
+			assert.Equal(t, "foo", p.Pick())
+
+			<-time.After(time.Millisecond * 2)
+		}
+
+		assert.NoError(t, p.Close())
+		assert.Error(t, p.Close())
+		assert.Panics(t, func() { p.Pick() })
+	})
+
+	t.Run("random once", func(t *testing.T) {
+		for i := uint8(0); i < 50; i++ {
+			p := pick.NewStringsSliceWithInterval([]string{}, pick.RandomOnce, time.Millisecond)
+			assert.Equal(t, "", p.Pick())
+			assert.NoError(t, p.Close())
+			assert.Panics(t, func() { p.Pick() })
+		}
+
+		var (
+			p      = pick.NewStringsSliceWithInterval([]string{"foo", "bar", "baz"}, pick.RandomOnce, time.Millisecond)
+			picked = p.Pick()
+		)
+
+		for i := uint8(0); i < 50; i++ {
+			assert.Equal(t, picked, p.Pick())
+
+			<-time.After(time.Millisecond * 2)
+		}
+
+		assert.NoError(t, p.Close())
+		assert.Error(t, p.Close())
+		assert.Panics(t, func() { p.Pick() })
+	})
+
+	t.Run("random every time", func(t *testing.T) {
+		for i := uint8(0); i < 50; i++ {
+			p := pick.NewStringsSliceWithInterval([]string{}, pick.RandomEveryTime, time.Millisecond)
+			assert.Equal(t, "", p.Pick())
+			assert.NoError(t, p.Close())
+			assert.Panics(t, func() { p.Pick() })
+		}
+
+		var changed int
+
+		for i := uint8(0); i < 50; i++ {
+			p := pick.NewStringsSliceWithInterval([]string{"foo", "bar", "baz"}, pick.RandomEveryTime, time.Millisecond) //nolint:lll
+
+			one, two := p.Pick(), p.Pick()
+			assert.Equal(t, one, two)
+
+			<-time.After(time.Millisecond * 2)
+
+			three, four := p.Pick(), p.Pick()
+			assert.Equal(t, three, four)
+
+			if one != three {
+				changed++
+			}
+
+			assert.NoError(t, p.Close())
+			assert.Error(t, p.Close())
+			assert.Panics(t, func() { p.Pick() })
+		}
+
+		assert.GreaterOrEqual(t, changed, 25)
+	})
+}

internal/tpl/errors.go

@@ -1,102 +0,0 @@
-package tpl
-
-import (
-	"errors"
-	"sync"
-)
-
-// Annotator allows to annotate error code.
-type Annotator struct {
-	Message     string
-	Description string
-}
-
-// Errors is a "cached storage" for the rendered error pages for the different templates and codes.
-type Errors struct {
-	templates map[string][]byte
-	codes     map[string]Annotator
-
-	cacheMu sync.RWMutex
-	cache   map[string]map[string][]byte // map[template]map[code]content
-}
-
-// NewErrors creates new Errors.
-func NewErrors(templates map[string][]byte, codes map[string]Annotator) *Errors {
-	return &Errors{
-		templates: templates,
-		codes:     codes,
-		cache:     make(map[string]map[string][]byte),
-	}
-}
-
-func (e *Errors) existsInCache(template, code string) ([]byte, bool) {
-	e.cacheMu.RLock()
-	defer e.cacheMu.RUnlock()
-
-	if codes, tplOk := e.cache[template]; tplOk {
-		if content, codeOk := codes[code]; codeOk {
-			return content, true
-		}
-	}
-
-	return nil, false
-}
-
-func (e *Errors) putInCache(template, code string) error {
-	if _, ok := e.templates[template]; !ok {
-		return errors.New("template \"" + template + "\" does not exists")
-	}
-
-	if _, ok := e.codes[code]; !ok {
-		return errors.New("code \"" + code + "\" does not exists")
-	}
-
-	e.cacheMu.Lock()
-	defer e.cacheMu.Unlock()
-
-	if _, ok := e.cache[template]; !ok {
-		e.cache[template] = make(map[string][]byte)
-	}
-
-	e.cache[template][code] = Replace(e.templates[template], Replaces{
-		Code:        code,
-		Message:     e.codes[code].Message,
-		Description: e.codes[code].Description,
-	})
-
-	return nil
-}
-
-// Get the rendered error page content.
-func (e *Errors) Get(template, code string) ([]byte, error) {
-	if content, ok := e.existsInCache(template, code); ok {
-		return content, nil
-	}
-
-	if err := e.putInCache(template, code); err != nil {
-		return nil, err
-	}
-
-	e.cacheMu.RLock()
-	defer e.cacheMu.RUnlock()
-
-	return e.cache[template][code], nil
-}
-
-// VisitAll allows to iterate all possible error pages and templates.
-func (e *Errors) VisitAll(fn func(template, code string, content []byte) error) error {
-	for tpl := range e.templates {
-		for code := range e.codes {
-			content, err := e.Get(tpl, code)
-			if err != nil {
-				return err // will never happen
-			}
-
-			if err = fn(tpl, code, content); err != nil {
-				return err
-			}
-		}
-	}
-
-	return nil
-}

internal/tpl/errors_test.go

@@ -1,106 +0,0 @@
-package tpl_test
-
-import (
-	"errors"
-	"sync"
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-	"github.com/tarampampam/error-pages/internal/tpl"
-)
-
-func TestErrors_Get(t *testing.T) {
-	e := tpl.NewErrors(
-		map[string][]byte{"foo": []byte("{{ code }}: {{ message }} {{ description }}")},
-		map[string]tpl.Annotator{"200": {"ok", "all is ok"}},
-	)
-
-	content, err := e.Get("foo", "200")
-	assert.NoError(t, err)
-	assert.Equal(t, "200: ok all is ok", string(content))
-
-	content, err = e.Get("foo", "666")
-	assert.EqualError(t, err, "code \"666\" does not exists")
-	assert.Nil(t, content)
-
-	content, err = e.Get("bar", "200")
-	assert.EqualError(t, err, "template \"bar\" does not exists")
-	assert.Nil(t, content)
-}
-
-func TestErrors_GetConcurrent(t *testing.T) {
-	e := tpl.NewErrors(
-		map[string][]byte{"foo": []byte("{{ code }}: {{ message }} {{ description }}")},
-		map[string]tpl.Annotator{"200": {"ok", "all is ok"}},
-	)
-
-	var wg sync.WaitGroup
-
-	for i := 0; i < 1234; i++ {
-		wg.Add(1)
-
-		go func() {
-			defer wg.Done()
-
-			content, err := e.Get("foo", "200")
-			assert.NoError(t, err)
-			assert.Equal(t, "200: ok all is ok", string(content))
-
-			content, err = e.Get("foo", "666")
-			assert.Error(t, err)
-			assert.Nil(t, content)
-		}()
-	}
-
-	wg.Wait()
-}
-
-func TestErrors_VisitAll(t *testing.T) {
-	e := tpl.NewErrors(
-		map[string][]byte{
-			"foo": []byte("{{ code }}: {{ message }} {{ description }}"),
-			"bar": []byte("{{ code }}: {{ message }} {{ description }}"),
-		},
-		map[string]tpl.Annotator{
-			"200": {"ok", "all is ok"},
-			"400": {"Bad Request", "The server did not understand the request"},
-		},
-	)
-
-	visited := make(map[string]map[string]bool) // map[template]codes
-
-	assert.NoError(t, e.VisitAll(func(template, code string, content []byte) error {
-		if _, ok := visited[template]; !ok {
-			visited[template] = make(map[string]bool)
-		}
-
-		visited[template][code] = true
-
-		assert.NotNil(t, content)
-
-		return nil
-	}))
-
-	assert.Len(t, visited, 2)
-	assert.Len(t, visited["foo"], 2)
-	assert.True(t, visited["foo"]["200"])
-	assert.True(t, visited["foo"]["400"])
-	assert.Len(t, visited["bar"], 2)
-	assert.True(t, visited["bar"]["200"])
-	assert.True(t, visited["bar"]["400"])
-}
-
-func TestErrors_VisitAllWillReturnTheError(t *testing.T) {
-	e := tpl.NewErrors(
-		map[string][]byte{
-			"foo": []byte("{{ code }}: {{ message }} {{ description }}"),
-		},
-		map[string]tpl.Annotator{
-			"200": {"ok", "all is ok"},
-		},
-	)
-
-	assert.EqualError(t, e.VisitAll(func(template, code string, content []byte) error {
-		return errors.New("foo error")
-	}), "foo error")
-}

internal/tpl/hasher.go

@@ -0,0 +1,25 @@
+package tpl
+
+import (
+	"bytes"
+	"crypto/md5" //nolint:gosec
+	"encoding/gob"
+)
+
+const hashLength = 16 // md5 hash length
+
+type Hash [hashLength]byte
+
+func HashStruct(s interface{}) (Hash, error) {
+	var b bytes.Buffer
+
+	if err := gob.NewEncoder(&b).Encode(s); err != nil {
+		return Hash{}, err
+	}
+
+	return md5.Sum(b.Bytes()), nil //nolint:gosec
+}
+
+func HashBytes(b []byte) Hash {
+	return md5.Sum(b) //nolint:gosec
+}

internal/tpl/hasher_test.go

@@ -0,0 +1,35 @@
+package tpl_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/tarampampam/error-pages/internal/tpl"
+)
+
+func TestHashBytes(t *testing.T) {
+	assert.NotEqual(t, tpl.HashBytes([]byte{1}), tpl.HashBytes([]byte{2}))
+}
+
+func TestHashStruct(t *testing.T) {
+	type s struct {
+		S string
+		I int
+		B bool
+	}
+
+	h1, err1 := tpl.HashStruct(s{S: "foo", I: 1, B: false})
+	assert.NoError(t, err1)
+
+	h2, err2 := tpl.HashStruct(s{S: "bar", I: 2, B: true})
+	assert.NoError(t, err2)
+
+	assert.NotEqual(t, h1, h2)
+
+	type p struct { // no exported fields
+		any string
+	}
+
+	_, err := tpl.HashStruct(p{any: "foo"})
+	assert.Error(t, err)
+}

internal/tpl/properties.go

@@ -0,0 +1,39 @@
+package tpl
+
+import (
+	"reflect"
+)
+
+type Properties struct { // only string properties with a "token" tag, please
+	Code               string `token:"code"`
+	Message            string `token:"message"`
+	Description        string `token:"description"`
+	OriginalURI        string `token:"original_uri"`
+	Namespace          string `token:"namespace"`
+	IngressName        string `token:"ingress_name"`
+	ServiceName        string `token:"service_name"`
+	ServicePort        string `token:"service_port"`
+	RequestID          string `token:"request_id"`
+	ForwardedFor       string `token:"forwarded_for"`
+	Host               string `token:"host"`
+	ShowRequestDetails bool
+}
+
+// Replaces return a map with strings for the replacing, where the map key is a token.
+func (p *Properties) Replaces() map[string]string {
+	var replaces = make(map[string]string, reflect.ValueOf(*p).NumField())
+
+	for i, v := 0, reflect.ValueOf(*p); i < v.NumField(); i++ {
+		if keyword, tagExists := v.Type().Field(i).Tag.Lookup("token"); tagExists {
+			if sv, isString := v.Field(i).Interface().(string); isString && len(sv) > 0 {
+				replaces[keyword] = sv
+			} else {
+				replaces[keyword] = ""
+			}
+		}
+	}
+
+	return replaces
+}
+
+func (p *Properties) Hash() (Hash, error) { return HashStruct(p) }

internal/tpl/properties_test.go

@@ -0,0 +1,66 @@
+package tpl_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/tarampampam/error-pages/internal/tpl"
+)
+
+func TestProperties_Replaces(t *testing.T) {
+	props := tpl.Properties{
+		Code:         "foo",
+		Message:      "bar",
+		Description:  "baz",
+		OriginalURI:  "aaa",
+		Namespace:    "bbb",
+		IngressName:  "ccc",
+		ServiceName:  "ddd",
+		ServicePort:  "eee",
+		RequestID:    "fff",
+		ForwardedFor: "ggg",
+		Host:         "hhh",
+	}
+
+	r := props.Replaces()
+
+	assert.Equal(t, "foo", r["code"])
+	assert.Equal(t, "bar", r["message"])
+	assert.Equal(t, "baz", r["description"])
+	assert.Equal(t, "aaa", r["original_uri"])
+	assert.Equal(t, "bbb", r["namespace"])
+	assert.Equal(t, "ccc", r["ingress_name"])
+	assert.Equal(t, "ddd", r["service_name"])
+	assert.Equal(t, "eee", r["service_port"])
+	assert.Equal(t, "fff", r["request_id"])
+	assert.Equal(t, "ggg", r["forwarded_for"])
+	assert.Equal(t, "hhh", r["host"])
+
+	props.Code, props.Message, props.Description = "", "", ""
+
+	r = props.Replaces()
+
+	assert.Equal(t, "", r["code"])
+	assert.Equal(t, "", r["message"])
+	assert.Equal(t, "", r["description"])
+}
+
+func TestProperties_Hash(t *testing.T) {
+	props1 := tpl.Properties{Code: "123"}
+	props2 := tpl.Properties{Code: "123"}
+
+	hash1, err := props1.Hash()
+	assert.NoError(t, err)
+
+	hash2, err := props2.Hash()
+	assert.NoError(t, err)
+
+	assert.Equal(t, hash1, hash2)
+
+	props2.Code = "321"
+
+	hash2, err = props2.Hash()
+	assert.NoError(t, err)
+
+	assert.NotEqual(t, hash1, hash2)
+}

internal/tpl/render.go

@@ -0,0 +1,216 @@
+package tpl
+
+import (
+	"bytes"
+	"encoding/json"
+	"os"
+	"strconv"
+	"sync"
+	"text/template"
+	"time"
+
+	"github.com/pkg/errors"
+	"github.com/tarampampam/error-pages/internal/version"
+)
+
+// These functions are always allowed in the templates.
+var tplFnMap = template.FuncMap{ //nolint:gochecknoglobals
+	"now":      time.Now,
+	"hostname": os.Hostname,
+	"json":     func(v interface{}) string { b, _ := json.Marshal(v); return string(b) }, //nolint:nlreturn
+	"version":  version.Version,
+	"int": func(v interface{}) int {
+		if s, ok := v.(string); ok {
+			if i, err := strconv.Atoi(s); err == nil {
+				return i
+			}
+		} else if i, ok := v.(int); ok {
+			return i
+		}
+
+		return 0
+	},
+}
+
+var ErrClosed = errors.New("closed")
+
+type TemplateRenderer struct {
+	cacheMu sync.RWMutex
+	cache   map[cacheEntryHash]cacheItem // map key is a unique hash
+
+	cacheCleanupInterval time.Duration
+	cacheItemLifetime    time.Duration
+
+	close    chan struct{}
+	closedMu sync.RWMutex
+	closed   bool
+}
+
+type (
+	cacheEntryHash = [hashLength * 2]byte // two md5 hashes
+	cacheItem      struct {
+		data          []byte
+		expiresAtNano int64
+	}
+)
+
+const (
+	cacheCleanupInterval = time.Second
+	cacheItemLifetime    = time.Second * 2
+)
+
+// NewTemplateRenderer returns new template renderer. Don't forget to call Close() function!
+func NewTemplateRenderer() *TemplateRenderer {
+	tr := &TemplateRenderer{
+		cache:                make(map[cacheEntryHash]cacheItem),
+		cacheCleanupInterval: cacheCleanupInterval,
+		cacheItemLifetime:    cacheItemLifetime,
+		close:                make(chan struct{}, 1),
+	}
+
+	go tr.cleanup()
+
+	return tr
+}
+
+func (tr *TemplateRenderer) cleanup() {
+	defer close(tr.close)
+
+	timer := time.NewTimer(tr.cacheCleanupInterval)
+	defer timer.Stop()
+
+	for {
+		select {
+		case <-tr.close:
+			tr.cacheMu.Lock()
+			for hash := range tr.cache {
+				delete(tr.cache, hash)
+			}
+			tr.cacheMu.Unlock()
+
+			return
+
+		case <-timer.C:
+			tr.cacheMu.Lock()
+			var now = time.Now().UnixNano()
+
+			for hash, item := range tr.cache {
+				if now > item.expiresAtNano {
+					delete(tr.cache, hash)
+				}
+			}
+			tr.cacheMu.Unlock()
+
+			timer.Reset(tr.cacheCleanupInterval)
+		}
+	}
+}
+
+func (tr *TemplateRenderer) Render(content []byte, props Properties) ([]byte, error) { //nolint:funlen
+	if tr.isClosed() {
+		return nil, ErrClosed
+	}
+
+	if len(content) == 0 {
+		return content, nil
+	}
+
+	var (
+		cacheKey     cacheEntryHash
+		cacheKeyInit bool
+	)
+
+	if propsHash, err := props.Hash(); err == nil {
+		cacheKeyInit, cacheKey = true, tr.mixHashes(propsHash, HashBytes(content))
+
+		tr.cacheMu.RLock()
+		item, hit := tr.cache[cacheKey]
+		tr.cacheMu.RUnlock()
+
+		if hit {
+			// cache item has been expired?
+			if time.Now().UnixNano() > item.expiresAtNano {
+				tr.cacheMu.Lock()
+				delete(tr.cache, cacheKey)
+				tr.cacheMu.Unlock()
+			} else {
+				return item.data, nil
+			}
+		}
+	}
+
+	var funcMap = template.FuncMap{
+		"show_details": func() bool { return props.ShowRequestDetails },
+		"hide_details": func() bool { return !props.ShowRequestDetails },
+	}
+
+	// make a copy of template functions map
+	for s, i := range tplFnMap {
+		funcMap[s] = i
+	}
+
+	// and allow the direct calling of Properties tokens, e.g. `{{ code | json }}`
+	for what, with := range props.Replaces() {
+		var n, s = what, with
+
+		funcMap[n] = func() string { return s }
+	}
+
+	t, err := template.New("").Funcs(funcMap).Parse(string(content))
+	if err != nil {
+		return nil, err
+	}
+
+	var buf bytes.Buffer
+
+	if err = t.Execute(&buf, props); err != nil {
+		return nil, err
+	}
+
+	b := buf.Bytes()
+
+	if cacheKeyInit {
+		tr.cacheMu.Lock()
+		tr.cache[cacheKey] = cacheItem{
+			data:          b,
+			expiresAtNano: time.Now().UnixNano() + tr.cacheItemLifetime.Nanoseconds(),
+		}
+		tr.cacheMu.Unlock()
+	}
+
+	return b, nil
+}
+
+func (tr *TemplateRenderer) isClosed() (closed bool) {
+	tr.closedMu.RLock()
+	closed = tr.closed
+	tr.closedMu.RUnlock()
+
+	return
+}
+
+func (tr *TemplateRenderer) Close() error {
+	if tr.isClosed() {
+		return ErrClosed
+	}
+
+	tr.closedMu.Lock()
+	tr.closed = true
+	tr.closedMu.Unlock()
+
+	tr.close <- struct{}{}
+
+	return nil
+}
+
+func (tr *TemplateRenderer) mixHashes(a, b Hash) (result cacheEntryHash) {
+	for i := 0; i < len(a); i++ {
+		result[i] = a[i]
+	}
+
+	for i := 0; i < len(b); i++ {
+		result[i+len(a)] = b[i]
+	}
+
+	return
+}

internal/tpl/render_test.go

@@ -0,0 +1,119 @@
+package tpl_test
+
+import (
+	"math/rand"
+	"strconv"
+	"sync"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/tarampampam/error-pages/internal/tpl"
+)
+
+func Test_Render(t *testing.T) {
+	renderer := tpl.NewTemplateRenderer()
+	defer func() { _ = renderer.Close() }()
+
+	for name, tt := range map[string]struct {
+		giveContent string
+		giveProps   tpl.Properties
+		wantContent string
+		wantError   bool
+	}{
+		"common case": {
+			giveContent: "{{code}}: {{ message }} {{description}}",
+			giveProps:   tpl.Properties{Code: "404", Message: "Not found", Description: "Blah"},
+			wantContent: "404: Not found Blah",
+		},
+		"html markup": {
+			giveContent: "<!-- comment --><html><body>{{code}}: {{ message }} {{description}}</body></html>",
+			giveProps:   tpl.Properties{Code: "201", Message: "lorem ipsum"},
+			wantContent: "<!-- comment --><html><body>201: lorem ipsum </body></html>",
+		},
+		"with line breakers": {
+			giveContent: "\t {{code}}: {{ message }} {{description}}\n",
+			giveProps:   tpl.Properties{},
+			wantContent: "\t :  \n",
+		},
+		"golang template": {
+			giveContent: "\t {{code}} {{ .Code }}{{ if .Message }} Yeah {{end}}",
+			giveProps:   tpl.Properties{Code: "201", Message: "lorem ipsum"},
+			wantContent: "\t 201 201 Yeah ",
+		},
+		"wrong golang template": {
+			giveContent: "{{ if foo() }} Test {{ end }}",
+			giveProps:   tpl.Properties{},
+			wantError:   true,
+		},
+
+		"json common case": {
+			giveContent: `{"code": {{code | json}}, "message": {"here":[ {{ message | json }} ]}, "desc": "{{description}}"}`,
+			giveProps:   tpl.Properties{Code: `404'"{`, Message: "Not found\t\r\n"},
+			wantContent: `{"code": "404'\"{", "message": {"here":[ "Not found\t\r\n" ]}, "desc": ""}`,
+		},
+		"json golang template": {
+			giveContent: `{"code": "{{code}}", "message": {"here":[ "{{ if .Message }} Yeah {{end}}" ]}}`,
+			giveProps:   tpl.Properties{Code: "201", Message: "lorem ipsum"},
+			wantContent: `{"code": "201", "message": {"here":[ " Yeah " ]}}`,
+		},
+	} {
+		t.Run(name, func(t *testing.T) {
+			content, err := renderer.Render([]byte(tt.giveContent), tt.giveProps)
+
+			if tt.wantError == true {
+				assert.Error(t, err)
+			} else {
+				assert.NoError(t, err)
+				assert.Equal(t, tt.wantContent, string(content))
+			}
+		})
+	}
+}
+
+func TestTemplateRenderer_Render_Concurrent(t *testing.T) {
+	renderer := tpl.NewTemplateRenderer()
+
+	var wg sync.WaitGroup
+
+	for i := 0; i < 100; i++ {
+		wg.Add(1)
+
+		go func() {
+			defer wg.Done()
+
+			props := tpl.Properties{
+				Code:        strconv.Itoa(rand.Intn(599-300+1) + 300), //nolint:gosec
+				Message:     "Not found",
+				Description: "Blah",
+			}
+
+			content, err := renderer.Render([]byte("{{code}}: {{ message }} {{description}}"), props)
+
+			assert.NoError(t, err)
+			assert.NotEmpty(t, content)
+		}()
+	}
+
+	wg.Wait()
+
+	assert.NoError(t, renderer.Close())
+	assert.EqualError(t, renderer.Close(), tpl.ErrClosed.Error())
+
+	content, err := renderer.Render([]byte{}, tpl.Properties{})
+	assert.Nil(t, content)
+	assert.EqualError(t, err, tpl.ErrClosed.Error())
+}
+
+func BenchmarkRenderHTML(b *testing.B) {
+	b.ReportAllocs()
+
+	renderer := tpl.NewTemplateRenderer()
+	defer func() { _ = renderer.Close() }()
+
+	for i := 0; i < b.N; i++ {
+		_, _ = renderer.Render(
+			[]byte("{{code}}: {{ message }} {{description}}"),
+			tpl.Properties{Code: "404", Message: "Not found", Description: "Blah"},
+		)
+	}
+}

internal/tpl/replace.go

@@ -1,47 +0,0 @@
-package tpl
-
-import "bytes"
-
-type Replaces struct {
-	Code        string
-	Message     string
-	Description string
-}
-
-const (
-	tknCode byte = iota + 1
-	tknMessage
-	tknDescription
-)
-
-var tknSets = map[byte][][]byte{ //nolint:gochecknoglobals
-	tknCode:        {[]byte("{{code}}"), []byte("{{ code }}")},
-	tknMessage:     {[]byte("{{message}}"), []byte("{{ message }}")},
-	tknDescription: {[]byte("{{description}}"), []byte("{{ description }}")},
-}
-
-// Replace found tokens in the incoming slice with passed tokens.
-func Replace(in []byte, re Replaces) []byte {
-	for tkn, set := range tknSets {
-		var replaceWith []byte
-
-		switch tkn {
-		case tknCode:
-			replaceWith = []byte(re.Code)
-		case tknMessage:
-			replaceWith = []byte(re.Message)
-		case tknDescription:
-			replaceWith = []byte(re.Description)
-		default:
-			panic("tpl: unsupported token")
-		}
-
-		if len(replaceWith) > 0 {
-			for i := 0; i < len(set); i++ {
-				in = bytes.ReplaceAll(in, set[i], replaceWith)
-			}
-		}
-	}
-
-	return in
-}

internal/tpl/replace_test.go

@@ -1,66 +0,0 @@
-package tpl_test
-
-import (
-	"fmt"
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-	"github.com/tarampampam/error-pages/internal/tpl"
-)
-
-func ExampleReplace() {
-	var in = []byte("{{ code }}: {{message}} ({{ description }})")
-
-	fmt.Println(string(tpl.Replace(in, tpl.Replaces{
-		Code:        "400",
-		Message:     "Bad Request",
-		Description: "The server did not understand the request",
-	})))
-
-	// Output:
-	// 400: Bad Request (The server did not understand the request)
-}
-
-func TestReplace(t *testing.T) {
-	for name, tt := range map[string]struct {
-		giveIn     []byte
-		giveRe     tpl.Replaces
-		wantResult []byte
-	}{
-		"common": {
-			giveIn: []byte("-- {{ code }} {{code}} __ {{message}} {{ description }} "),
-			giveRe: tpl.Replaces{
-				Code:        "123",
-				Message:     "message",
-				Description: "desc",
-			},
-			wantResult: []byte("-- 123 123 __ message desc "),
-		},
-		"alpha and underline in the code": {
-			giveIn: []byte("\t{{ code }}\t"),
-			giveRe: tpl.Replaces{
-				Code: "  qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM_  ",
-			},
-			wantResult: []byte("\t  qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM_  \t"),
-		},
-	} {
-		tt := tt
-
-		t.Run(name, func(t *testing.T) {
-			assert.Equal(t, tt.wantResult, tpl.Replace(tt.giveIn, tt.giveRe))
-		})
-	}
-}
-
-func BenchmarkReplace(b *testing.B) {
-	b.ReportAllocs()
-	b.ResetTimer()
-
-	for i := 0; i < b.N; i++ {
-		tpl.Replace([]byte("-- {{ code }} {{code}} __ {{message}} {{ description }} "), tpl.Replaces{
-			Code:        "123",
-			Message:     "message",
-			Description: "desc",
-		})
-	}
-}

l10n/.eslintrc.json

@@ -0,0 +1,11 @@
+{
+    "extends": [
+        "eslint:recommended"
+    ],
+    "parserOptions": {
+        "ecmaVersion": 2017
+    },
+    "env": {
+        "browser": true
+    }
+}

l10n/l10n.js

@@ -0,0 +1,440 @@
+Object.defineProperty(window, 'l10n', {
+    value: new function () {
+        // language codes list: <https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes>
+        const data = { // all keys should be in english (it is default/main locale)
+            'Error': {
+                fr: 'Erreur',
+                ru: 'Ошибка',
+                uk: 'Помилка',
+            },
+            'Good luck': {
+                fr: 'Bonne chance',
+                ru: 'Удачи',
+                uk: 'Успіхів',
+            },
+            'UH OH': {
+                fr: 'Oups',
+                ru: 'Ох',
+                uk: 'Ох',
+            },
+            'Request details': {
+                fr: 'Détails de la requête',
+                ru: 'Детали запроса',
+                uk: 'Деталі запиту',
+            },
+            'Double-check the URL': {
+                fr: 'Vérifiez l’URL',
+                ru: 'Дважды проверьте URL',
+                uk: 'Двічі перевіряйте URL-адресу',
+            },
+            'Alternatively, go back': {
+                fr: 'Essayer de revenir en arrière',
+                ru: 'Или можете вернуться назад',
+                uk: 'Або ви можете повернутися',
+            },
+            'Here\'s what might have happened': {
+                fr: 'Voici ce qui aurait pu se passer',
+                ru: 'Из-за чего это могло случиться',
+                uk: 'Що це може статися',
+            },
+            'You may have mistyped the URL': {
+                fr: 'Vous avez peut-être mal tapé l’URL',
+                ru: 'Вы могли ошибиться в URL',
+                uk: 'Ви можете зробити помилку в URL-адресі',
+            },
+            'The site was moved': {
+                fr: 'Le site a été déplacé',
+                ru: 'Сайт был перемещён',
+                uk: 'Сайт був переміщений',
+            },
+            'It was never here': {
+                fr: 'Il n’a jamais été ici',
+                ru: 'Он никогда не был здесь',
+                uk: 'Він ніколи не був тут',
+            },
+
+            'Bad Request': {
+                fr: 'Mauvaise requête',
+                ru: 'Некорректный запрос',
+                uk: 'Неправильний запит',
+            },
+            'The server did not understand the request': {
+                fr: 'Le serveur ne comprend pas la requête',
+                ru: 'Сервер не смог обработать запрос из-за ошибки в нём',
+                uk: 'Сервер не міг обробити запит через помилку в ньому',
+            },
+            'Unauthorized': {
+                fr: 'Non autorisé',
+                ru: 'Запрос не авторизован',
+                uk: 'Несанкціонований доступ',
+            },
+            'The requested page needs a username and a password': {
+                fr: 'La page demandée nécessite un nom d’utilisateur et un mot de passe',
+                ru: 'Для доступа к странице требуется логин и пароль',
+                uk: 'Щоб отримати доступ до сторінки, потрібний логін та пароль',
+            },
+            'Forbidden': {
+                fr: 'Interdit',
+                ru: 'Запрещено',
+                uk: 'Заборонено',
+            },
+            'Access is forbidden to the requested page': {
+                fr: 'Accès interdit à la page demandée',
+                ru: 'Доступ к странице запрещён',
+                uk: 'Доступ до сторінки заборонено',
+            },
+            'Not Found': {
+                fr: 'Introuvable',
+                ru: 'Страница не найдена',
+                uk: 'Сторінка не знайдена',
+            },
+            'The server can not find the requested page': {
+                fr: 'Le serveur ne peut trouver la page demandée',
+                ru: 'Сервер не смог найти запрашиваемую страницу',
+                uk: 'Сервер не міг знайти запитану сторінку',
+            },
+            'Method Not Allowed': {
+                fr: 'Méthode Non Autorisée',
+                ru: 'Метод не поддерживается',
+                uk: 'Неприпустимий метод',
+            },
+            'The method specified in the request is not allowed': {
+                fr: 'La méthode spécifiée dans la requête n’est pas autorisée',
+                ru: 'Указанный в запросе метод не поддерживается',
+                uk: 'Метод, зазначений у запиті, не підтримується',
+            },
+            'Proxy Authentication Required': {
+                fr: 'Authentification proxy requise',
+                ru: 'Нужна аутентификация прокси',
+                uk: 'Потрібна ідентифікація проксі',
+            },
+            'You must authenticate with a proxy server before this request can be served': {
+                fr: 'Vous devez vous authentifier avec un serveur proxy avant que cette requête puisse être servie',
+                ru: 'Вы должны быть авторизованы на прокси сервере для обработки этого запроса',
+                uk: 'Ви повинні увійти до проксі-сервера для обробки цього запиту',
+            },
+            'Request Timeout': {
+                fr: 'Requête expiré',
+                ru: 'Истекло время ожидания',
+                uk: 'Час запиту закінчився',
+            },
+            'The request took longer than the server was prepared to wait': {
+                fr: 'La requête prend plus de temps que prévu',
+                ru: 'Отправка запроса заняла слишком много времени',
+                uk: 'Надсилання запиту зайняв занадто багато часу',
+            },
+            'Conflict': {
+                fr: 'Conflit',
+                ru: 'Конфликт',
+                uk: 'Конфлікт',
+            },
+            'The request could not be completed because of a conflict': {
+                fr: 'La requête n’a pas pu être complétée à cause d’un conflit',
+                ru: 'Запрос не может быть обработан из-за конфликта',
+                uk: 'Запит не може бути оброблений через конфлікт',
+            },
+            'Gone': {
+                fr: 'Supprimé',
+                ru: 'Удалено',
+                uk: 'Вилучений',
+            },
+            'The requested page is no longer available': {
+                fr: 'La page demandée n’est plus disponible',
+                ru: 'Запрошенная страница была удалена',
+                uk: 'Запитана сторінка була видалена',
+            },
+            'Length Required': {
+                fr: 'Longueur requise',
+                ru: 'Необходима длина',
+                uk: 'Потрібно вказати розмір',
+            },
+            'The "Content-Length" is not defined. The server will not accept the request without it': {
+                fr: 'Le "Content-Length" n’est pas défini. Le serveur ne prendra pas en compte la requête',
+                ru: 'Заголовок "Content-Length" не был передан. Сервер не может обработать запрос без него',
+                uk: 'Заголовок "Content-Length" не був переданий. Сервер не може обробити запит без нього',
+            },
+            'Precondition Failed': {
+                fr: 'Échec de la condition préalable',
+                ru: 'Условие ложно',
+                uk: 'Збій під час обробки попередньої умови',
+            },
+            'The pre condition given in the request evaluated to false by the server': {
+                fr: 'La précondition donnée dans la requête a été évaluée comme étant fausse par le serveur',
+                ru: 'Ни одно из условных полей заголовка запроса не было выполнено',
+                uk: 'Жодна з умовних полів заголовка запиту не була виконана',
+            },
+            'Payload Too Large': {
+                fr: 'Charge trop volumineuse',
+                ru: 'Слишком большой запрос',
+                uk: 'Занадто великий запит',
+            },
+            'The server will not accept the request, because the request entity is too large': {
+                fr: 'Le serveur ne prendra pas en compte la requête, car l’entité de la requête est trop volumineuse',
+                ru: 'Сервер не может обработать запрос, так как он слишком большой',
+                uk: 'Сервер не може обробити запит, оскільки він занадто великий',
+            },
+            'Requested Range Not Satisfiable': {
+                fr: 'Requête non satisfaisante',
+                ru: 'Диапазон не достижим',
+                uk: 'Запитуваний діапазон недосяжний',
+            },
+            'The requested byte range is not available and is out of bounds': {
+                fr: 'Le byte range demandé n’est pas disponible et est hors des limites',
+                ru: 'Запрошенный диапазон данных недоступен или вне допустимых пределов',
+                uk: 'Описаний діапазон даних недоступний або з допустимих меж',
+            },
+            'I\'m a teapot': {
+                fr: 'Je suis une théière',
+                ru: 'Я чайник',
+                uk: 'Я чайник',
+            },
+            'Attempt to brew coffee with a teapot is not supported': {
+                fr: 'Tenter de préparer du café avec une théière n’est pas pris en charge',
+                ru: 'Попытка заварить кофе в чайнике обречена на фиаско',
+                uk: 'Спроба виварити каву в чайник приречена на фіаско',
+            },
+            'Too Many Requests': {
+                fr: 'Trop de requêtes',
+                ru: 'Слишком много запросов',
+                uk: 'Занадто багато запитів',
+            },
+            'Too many requests in a given amount of time': {
+                fr: 'Trop de requêtes dans un délai donné',
+                ru: 'Отправлено слишком много запросов за короткое время',
+                uk: 'Надіслано занадто багато запитів на короткий час',
+            },
+            'Internal Server Error': {
+                fr: 'Erreur interne du serveur',
+                ru: 'Внутренняя ошибка сервера',
+                uk: 'Внутрішня помилка сервера',
+            },
+            'The server met an unexpected condition': {
+                fr: 'Le serveur a rencontré une condition inattendue',
+                ru: 'Произошло что-то неожиданное на сервере',
+                uk: 'На сервері було щось несподіване',
+            },
+            'Bad Gateway': {
+                fr: 'Mauvaise passerelle',
+                ru: 'Ошибка шлюза',
+                uk: 'Помилка шлюзу',
+            },
+            'The server received an invalid response from the upstream server': {
+                fr: 'Le serveur a reçu une réponse invalide du serveur distant',
+                ru: 'Сервер получил некорректный ответ от вышестоящего сервера',
+                uk: 'Сервер отримав неправильну відповідь з сервера Upstream',
+            },
+            'Service Unavailable': {
+                fr: 'Service indisponible',
+                ru: 'Сервис недоступен',
+                uk: 'Сервіс недоступний',
+            },
+            'The server is temporarily overloading or down': {
+                fr: 'Le serveur est temporairement en surcharge ou indisponible',
+                ru: 'Сервер временно не может обрабатывать запросы по техническим причинам',
+                uk: 'Сервер тимчасово не може обробляти запити з технічних причин',
+            },
+            'Gateway Timeout': {
+                fr: 'Expiration Passerelle',
+                ru: 'Шлюз не отвечает',
+                uk: 'Шлюз не відповідає',
+            },
+            'The gateway has timed out': {
+                fr: 'Le temps d’attente de la passerelle est dépassé',
+                ru: 'Сервер не дождался ответа от вышестоящего сервера',
+                uk: 'Сервер не чекав відповіді від сервера Upstream',
+            },
+            'HTTP Version Not Supported': {
+                fr: 'Version HTTP non prise en charge',
+                ru: 'Версия HTTP не поддерживается',
+                uk: 'Версія НТТР не підтримується',
+            },
+            'The server does not support the "http protocol" version': {
+                fr: 'Le serveur ne supporte pas la version du protocole HTTP',
+                ru: 'Сервер не поддерживает запрошенную версию HTTP протокола',
+                uk: 'Сервер не підтримує запитану версію HTTP-протоколу',
+            },
+
+            'Host': {
+                fr: 'Hôte',
+                ru: 'Хост',
+                uk: 'Хост',
+            },
+            'Original URI': {
+                fr: 'URI d’origine',
+                ru: 'Исходный URI',
+                uk: 'Вихідний URI',
+            },
+            'Forwarded for': {
+                fr: 'Transmis pour',
+                ru: 'Перенаправлен',
+                uk: 'Перенаправлений',
+            },
+            'Namespace': {
+                fr: 'Espace de noms',
+                ru: 'Пространство имён',
+                uk: 'Простір імен',
+            },
+            'Ingress name': {
+                fr: 'Nom ingress',
+                ru: 'Имя Ingress',
+                uk: 'Ім\'я Ingress',
+            },
+            'Service name': {
+                fr: 'Nom du service',
+                ru: 'Имя сервиса',
+                uk: 'Ім\'я сервісу',
+            },
+            'Service port': {
+                fr: 'Port du service',
+                ru: 'Порт сервиса',
+                uk: 'Порт сервісу',
+            },
+            'Request ID': {
+                fr: 'Identifiant de la requête',
+                ru: 'ID запроса',
+                uk: 'ID запиту',
+            },
+            'Timestamp': {
+                fr: 'Horodatage',
+                ru: 'Временная метка',
+                uk: 'Тимчасова мітка',
+            },
+
+            'client-side error': {
+                fr: 'Erreur Client',
+                ru: 'ошибка на стороне клиента',
+                uk: 'помилка на стороні клієнта',
+            },
+            'server-side error': {
+                fr: 'Erreur Serveur',
+                ru: 'ошибка на стороне сервера',
+                uk: 'помилка на стороні сервера',
+            },
+
+            'Your Client': {
+                fr: 'Votre Client',
+                ru: 'Ваш Браузер',
+                uk: 'Ваш Браузер',
+            },
+            'Network': {
+                fr: 'Réseau',
+                ru: 'Сеть',
+                uk: 'Сіть',
+            },
+            'Web Server': {
+                fr: 'Serveur Web',
+                ru: 'Web Сервер',
+                uk: 'Web Сервер',
+            },
+            'What happened?': {
+                fr: 'Que s’est-il passé ?',
+                ru: 'Что произошло?',
+                uk: 'Що сталося?',
+            },
+            'What can i do?': {
+                fr: 'Que puis-je faire ?',
+                ru: 'Что можно сделать?',
+                uk: 'Що можна зробити?',
+            },
+            'Please try again in a few minutes': {
+                fr: 'Veuillez réessayer dans quelques minutes',
+                ru: 'Пожалуйста, попробуйте повторить запрос ещё раз чуть позже',
+                uk: 'Будь ласка, спробуйте повторити запит ще раз трохи пізніше',
+            },
+            'Working': {
+                fr: 'Opérationnel',
+                ru: 'Работает',
+                uk: 'Працює',
+            },
+            'Unknown': {
+                fr: 'Inconnu',
+                ru: 'Неизвестно',
+                uk: 'Невідомо',
+            },
+            'Please try to change the request method, headers, payload, or URL': {
+                fr: 'Veuillez essayer de changer la méthode de requête, les en-têtes, le contenu ou l’URL',
+                ru: 'Пожалуйста, попробуйте изменить метод запроса, заголовки, его содержимое или URL',
+                uk: 'Будь ласка, спробуйте змінити метод запиту, заголовки, його вміст або URL-адресу',
+            },
+            'Please check your authorization data': {
+                fr: 'Veuillez vérifier vos données d’autorisation',
+                ru: 'Пожалуйста, проверьте данные авторизации',
+                uk: 'Будь ласка, перевірте дані авторизації',
+            },
+            'Please double-check the URL and try again': {
+                fr: 'Veuillez vérifier l’URL et réessayer',
+                ru: 'Пожалуйста, дважды проверьте URL и попробуйте снова',
+                uk: 'Будь ласка, двічі перевірте URL-адресу і спробуйте знову',
+            },
+        };
+
+        /**
+         * @param {string} token
+         * @return {string}
+         */
+        const serializeToken = function (token) {
+            return token.toLowerCase().replaceAll(/[^a-z0-9]/g, '');
+        };
+
+        // normalize the data keys
+        for (const key in data) {
+            Object.defineProperty(data, serializeToken(key), Object.getOwnPropertyDescriptor(data, key));
+            delete data[key];
+        }
+
+        // detect browser locale (take only 2 first symbols)
+        let activeLocale = navigator.language.substring(0, 2).toLowerCase();
+
+        /**
+         * @param {string} locale
+         */
+        this.setLocale = function (locale) {
+            activeLocale = locale.toLowerCase();
+        }
+
+        /**
+         * @param {string} token
+         * @param {string|undefined?} def
+         */
+        this.translate = function (token, def) {
+            const t = serializeToken(token);
+
+            if (activeLocale === 'en' && Object.prototype.hasOwnProperty.call(data, t)) {
+                return token
+            }
+
+            if (Object.prototype.hasOwnProperty.call(data, t) && Object.prototype.hasOwnProperty.call(data[t], activeLocale)) {
+                return data[t][activeLocale];
+            }
+
+            return def;
+        };
+
+        /**
+         * Localize all elements with HTML attribute `data-l10n`.
+         */
+        this.localizeDocument = function () {
+            const dataAttributeName = 'data-l10n';
+
+            Array.prototype.forEach.call(document.querySelectorAll('[' + dataAttributeName + ']'), ($el) => {
+                const attr = $el.getAttribute(dataAttributeName).trim(),
+                    token = attr.length > 0 ? attr : $el.innerText.trim(),
+                    localized = this.translate(token, undefined);
+
+                if (attr.length === 0) {
+                    $el.setAttribute(dataAttributeName, token);
+                }
+
+                if (localized !== undefined) {
+                    $el.innerText = localized;
+                } else {
+                    console.debug(`Unsupported l10n token detected: "${token}" (locale "${activeLocale}")`, $el);
+                }
+            });
+        };
+    },
+    writable: false,
+    enumerable: false,
+});
+
+window.l10n.localizeDocument();

l10n/readme.md

@@ -0,0 +1,16 @@
+# 🔤 Localization
+
+[![jsDelivr hits](https://img.shields.io/jsdelivr/gh/hm/tarampampam/error-pages)](https://www.jsdelivr.com/package/gh/tarampampam/error-pages)
+
+This directory contains file [l10n.js](l10n.js) for the error pages localization. The working logic is very simple - pages load this script using [jsdelivr.com](https://www.jsdelivr.com/) as a CDN for [versioned content from the GitHub repository](https://www.jsdelivr.com/features#gh), and it translates tag content with the special HTML attribute `data-l10n`.
+
+By default, pages markup contains strings in English (`en` locale). If you want to localize the error pages on the different locales, you should:
+
+- Find your locale name on [this page](https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes) (column `639-1`)
+- Make a fork of this repository
+- Edit file [l10n.js](l10n.js) in `data` section (append new localized strings) using locale name from the step 1
+- Make a PR with your changes
+
+## 👍 Translators
+
+- 🇫🇷 French by [@jvin042](https://github.com/jvin042)

schemas/config/1.0.schema.json

@@ -0,0 +1,108 @@
+{
+    "$schema": "http://json-schema.org/draft-07/schema#",
+    "title": "Error-Pages config file schema",
+    "description": "Error-Pages config file schema.",
+    "type": "object",
+    "properties": {
+        "templates": {
+            "type": "array",
+            "description": "Templates list",
+            "items": {
+                "type": "object",
+                "description": "Template properties",
+                "properties": {
+                    "path": {
+                        "type": "string",
+                        "description": "Path to the template file",
+                        "examples": [
+                            "./templates/ghost.html",
+                            "/opt/tpl/ghost.htm"
+                        ]
+                    },
+                    "name": {
+                        "type": "string",
+                        "description": "Template name (optional, if path is defined)",
+                        "examples": [
+                            "ghost"
+                        ]
+                    },
+                    "content": {
+                        "type": "string",
+                        "description": "Template content, if path is not defined",
+                        "examples": [
+                            "<html><body>{{ code }}: {{ message }}</body></html>"
+                        ]
+                    }
+                },
+                "additionalProperties": false
+            }
+        },
+        "formats": {
+            "type": "object",
+            "description": "Responses, based on requested content-type format",
+            "properties": {
+                "json": {
+                    "type": "object",
+                    "description": "JSON format",
+                    "properties": {
+                        "content": {
+                            "type": "string",
+                            "description": "JSON response body (template tags are allowed here)",
+                            "examples": [
+                                "{\"error\": true, \"code\": {{ code | json }}, \"message\": {{ message | json }}}"
+                            ]
+                        }
+                    },
+                    "additionalProperties": false
+                },
+                "xml": {
+                    "type": "object",
+                    "description": "XML format",
+                    "properties": {
+                        "content": {
+                            "type": "string",
+                            "description": "XML response body (template tags are allowed here)",
+                            "examples": [
+                                "<?xml version=\"1.0\" encoding=\"utf-8\"?><error><code>{{ code }}</code><message>{{ message }}</message></error>"
+                            ]
+                        }
+                    },
+                    "additionalProperties": false
+                }
+            },
+            "additionalProperties": false
+        },
+        "pages": {
+            "type": "object",
+            "description": "Error pages (codes)",
+            "patternProperties": {
+                "^[a-zA-Z0-9_-]+$": {
+                    "type": "object",
+                    "description": "Error page (code)",
+                    "properties": {
+                        "message": {
+                            "type": "string",
+                            "description": "Error page message (title)",
+                            "examples": [
+                                "Bad Request"
+                            ]
+                        },
+                        "description": {
+                            "type": "string",
+                            "description": "Error page description",
+                            "examples": [
+                                "The server did not understand the request"
+                            ]
+                        }
+                    },
+                    "additionalProperties": false
+                }
+            },
+            "additionalProperties": false
+        }
+    },
+    "additionalProperties": false,
+    "required": [
+        "templates"
+    ]
+}

schemas/config/readme.md

@@ -0,0 +1,13 @@
+# Config file schemas
+
+These schemas describe Error Pages configuration file and used by:
+
+- <https://github.com/SchemaStore/schemastore>
+
+Schemas naming agreement: `<version_major>.<version_minor>.schema.json`.
+
+## Contributing guide
+
+If you want to modify the existing schema - your changes **MUST** be backward compatible. If your changes break backward compatibility - you **MUST** create a new schema file with a fresh version and "register" it in a [schemas catalog][schemas_catalog].
+
+[schemas_catalog]:https://github.com/SchemaStore/schemastore/blob/master/src/api/json/catalog.json

schemas/readme.md

@@ -0,0 +1,15 @@
+# Schemas
+
+This directory contains public schemas for the most important parts of application.
+
+**Do not rename or remove this directory or any file or directory inside.**
+
+- You can validate existing config file using the following command:
+
+ ```bash
+ $ docker run --rm -v "$(pwd):/src" -w "/src" node:16-alpine sh -c \
+     "npm install -g ajv-cli && \
+     ajv validate --all-errors --verbose \
+       -s ./schemas/config/1.0.schema.json \
+       -d ./error-pages.y*ml"
+ ```

templates/app-down.html

@@ -0,0 +1,242 @@
+<!DOCTYPE html>
+<!--
+    Error {{ code }}: {{ message }}
+    Description: {{ description }}
+-->
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width,initial-scale=1">
+    <meta name="robots" content="noindex, nofollow"/>
+    <title>{{ message }}</title>
+    <meta http-equiv="X-UA-Compatible" content="IE=edge">
+    <link rel="preconnect" href="https://fonts.googleapis.com">
+    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
+    <link href="https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700&display=swap" rel="stylesheet">
+    <style>
+        :root{--color-bg-primary:#fff;--color-bg-secondary:#eef6fa;--color-bg-sign:#fff;--color-text-primary:#333;--color-text-secondary:#777;--color-img-details:#f62f37;--color-img-primary:#7990a1;--color-img-secondary:#00baff;--font-size-small:13px;--font-size-normal:16px;--font-size-large:45px}
+        @media (prefers-color-scheme:dark){
+            :root{--color-bg-primary:#222526;--color-bg-secondary:#292e2f;--color-bg-sign:#262828;--color-text-primary:#fff;--color-text-secondary:#999;--color-img-details:#c72d34;--color-img-primary:#adacac;--color-img-secondary:#86d3ff}
+        }
+        body,html{background-color:var(--color-bg-primary);color:var(--color-text-primary);font-family:Roboto,Helvetica,sans-serif;font-size:0;margin:0;padding:0;height:100vh;overflow-x:hidden}
+        body{align-items:center;display:flex;justify-content:center;height:100vh}
+        main{width:100%;max-width:1024px;padding:0 40px;display:flex;justify-content:space-between}
+        .content,.picture{box-sizing:border-box}
+        .content{display:flex;flex-direction:column;flex-shrink:0;justify-content:space-around;width:45%;z-index:1}
+        a,p,ul li{font-size:var(--font-size-normal)}
+        .title{line-height:1.2;font-size:var(--font-size-large);margin:0 0 30px;width:130%}
+        .subtitle{display:flex;flex-direction:column;justify-content:center;margin:16px 0}
+        ul{padding:0;list-style:none;line-height:24px}
+        ul li::before{content:'•';padding-right:7px;color:var(--color-img-secondary)}
+        /* {{ if show_details }} */
+        .details{margin:0 0 16px 0}
+        .details p{font-size:var(--font-size-small)}
+        .details ul{line-height:0}
+        .details ul li{padding-top:calc(var(--font-size-small) * 1.5)}
+        .details ul li:first-child{padding-top:calc(var(--font-size-small) * .6)}
+        .details code,.details span,.details ul li::before{font-size:var(--font-size-small);font-weight:400}
+        .details code{padding-left:7px}
+        /* {{ end }} */
+        a{text-decoration:none;color:var(--color-img-secondary)}
+        .hidden{display:none}
+        .picture{display:flex;align-items:center;justify-content:center;width:55%;user-select:none;z-index:0}
+        .picture svg{width:100%}
+        .picture svg .st10,.picture svg .st11,.picture svg .st12,.picture svg .st13,.picture svg .st14,.picture svg .st15,.picture svg .st16,.picture svg .st17,.picture svg .st3,.picture svg .st6,.picture svg .st9{stroke-linecap:round;stroke-linejoin:round;stroke-miterlimit:10}
+        .picture svg .st0{fill:var(--color-bg-primary)}
+        .picture svg .st1{fill:url(#svg-background-gradient)}
+        .picture svg .st2{fill:var(--color-bg-secondary)}
+        .picture svg .st3{fill:var(--color-bg-primary);stroke:var(--color-img-primary);stroke-width:3.5}
+        .picture svg .st4{fill:var(--color-img-secondary)}
+        .picture svg .st5{fill:none;stroke:var(--color-img-secondary);stroke-width:4;stroke-linejoin:round;stroke-miterlimit:10}
+        .picture svg .st6{fill:var(--color-bg-primary);stroke:var(--color-img-primary);stroke-width:3}
+        .picture svg .st7{fill:var(--color-img-primary)}
+        .picture svg .st8{fill:none;stroke:var(--color-img-primary);stroke-width:2.5;stroke-linecap:round;stroke-miterlimit:10}
+        .picture svg .st9{fill:none;stroke:var(--color-img-primary);stroke-width:3}
+        .picture svg .st10{fill:none;stroke:var(--color-img-primary);stroke-width:3.5}
+        .picture svg .st11{fill:none;stroke:var(--color-img-secondary);stroke-width:4}
+        .picture svg .st12{fill:var(--color-bg-primary);stroke:var(--color-img-primary);stroke-width:4}
+        .picture svg .st13{fill:none;stroke:var(--color-img-primary);stroke-width:4}
+        .picture svg .st14{fill:none;stroke:var(--color-img-secondary);stroke-width:4.5}
+        .picture svg .st15{fill:none;stroke:var(--color-img-secondary);stroke-width:5}
+        .picture svg .st16{fill:none;stroke:var(--color-img-primary);stroke-width:5}
+        .picture svg .st17{fill:var(--color-bg-primary);stroke:var(--color-img-details);stroke-width:3.5}
+        .picture svg .st19{fill:none;stroke:var(--color-img-details);stroke-width:2.5;stroke-linecap:round;stroke-miterlimit:10}
+        .picture svg .error-code{font:bold 40px sans-serif;fill:var(--color-img-details)}
+        @media (max-width:1024px){
+            :root{--font-size-small:11px;--font-size-normal:14px;--font-size-large:35px}
+            main{display:block;position:relative;padding-top:40px}
+            .content,.picture{width:100%}
+            .content{position:relative;margin:0 auto;z-index:1}
+            .title{width:100%}
+            .picture{position:absolute;top:0;left:0;z-index:0;opacity:.2;width:100%;height:100%;padding:0}
+            .picture svg{max-width:70%}
+        }
+        @media (max-width:600px){
+            .picture svg{max-width:100%}
+        }
+    </style>
+</head>
+<body>
+<main>
+    <div class="content">
+        <h2 class="title" data-l10n>{{ message }}</h2>
+        <p data-l10n>{{ description }}</p>
+        <div class="subtitle if-not-found hidden">
+            <p><span data-l10n>Here's what might have happened</span>:</p>
+            <ul>
+                <li data-l10n>You may have mistyped the URL</li>
+                <li data-l10n>The site was moved</li>
+                <li data-l10n>It was never here</li>
+            </ul>
+        </div>
+        <p class="if-maybe-wrong-uri"><span data-l10n>Double-check the URL</span>. <a class="go-back hidden" data-l10n>Alternatively, go back</a></p>
+        {{ if show_details }}
+        <div class="details">
+            <p><span data-l10n>Request details</span>:</p>
+            <ul>
+                {{- if host }}<li><span><span data-l10n>Host</span>:</span> <code>{{ host }}</code></li>{{ end -}}
+                {{- if original_uri }}<li><span><span data-l10n>Original URI</span>:</span> <code>{{ original_uri }}</code></li>{{ end -}}
+                {{- if forwarded_for }}<li><span><span data-l10n>Forwarded for</span>:</span> <code>{{ forwarded_for }}</code></li>{{ end -}}
+                {{- if namespace }}<li><span><span data-l10n>Namespace</span>:</span> <code>{{ namespace }}</code></li>{{ end -}}
+                {{- if ingress_name }}<li><span><span data-l10n>Ingress name</span>:</span> <code>{{ ingress_name }}</code></li>{{ end -}}
+                {{- if service_name }}<li><span><span data-l10n>Service name</span>:</span> <code>{{ service_name }}</code></li>{{ end -}}
+                {{- if service_port }}<li><span><span data-l10n>Service port</span>:</span> <code>{{ service_port }}</code></li>{{ end -}}
+                {{- if request_id }}<li><span><span data-l10n>Request ID</span>:</span> <code>{{ request_id }}</code></li>{{ end -}}
+                <li><span><span data-l10n>Timestamp</span>:</span> <code>{{ now.Unix }}</code></li>
+            </ul>
+        </div>
+        {{ end }}
+    </div>
+    <div class="picture">
+        <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 600 480" x="0px" y="0px" xml:space="preserve">
+            <rect y="0" class="st0" width="600" height="480"></rect>
+            <radialgradient id="svg-background-gradient" cx="328.1394" cy="306.3561" r="219.5134" gradientUnits="userSpaceOnUse">
+                <stop offset="0" style="stop-color:var(--color-bg-secondary)"></stop>
+                <stop offset="0.5002" style="stop-color:var(--color-bg-secondary)"></stop>
+                <stop offset="1" style="stop-color:var(--color-bg-primary)"></stop>
+            </radialgradient>
+            <rect x="95.2" y="35.7" class="st1" width="460" height="271.4"></rect>
+            <ellipse class="st2" cx="289.7" cy="352.3" rx="69.5" ry="13.9"></ellipse>
+            <ellipse class="st2" cx="180.5" cy="396.3" rx="51.2" ry="9.5"></ellipse>
+            <ellipse class="st2" cx="381.3" cy="418.3" rx="40.8" ry="6.4"></ellipse>
+            <path class="st3" d="M551.1,285.8H527c-2.3,0-4.1-1.8-4.1-4.1v-30c0-2.3,1.8-4.1,4.1-4.1h24.1c2.3,0,4.1,1.8,4.1,4.1v30 C555.2,284,553.4,285.8,551.1,285.8z"></path>
+            <circle class="st3" cx="539.1" cy="266.7" r="10.3"></circle>
+            <path class="st4" d="M265.6,343.3c-5,0-9,4-9,9h18C274.6,347.3,270.6,343.3,265.6,343.3z"></path>
+            <line class="st5" x1="272.7" y1="328.1" x2="272.7" y2="352.3"></line>
+            <path class="st4" d="M307,343.3c-5,0-9,4-9,9h18C316,347.3,311.9,343.3,307,343.3z"></path>
+            <line class="st5" x1="314.1" y1="328.1" x2="314.1" y2="352.3"></line>
+            <path class="st6" d="M380.7,422.6l-37.6-6.4c-1.5-0.3-2.5-1.5-2.2-2.9l4.6-26.8c0.2-1.4,1.6-2.2,3-2l37.6,6.4 c1.5,0.3,2.5,1.5,2.2,2.9l-4.6,26.8C383.6,422,382.2,422.9,380.7,422.6z"></path>
+            <path class="st6" d="M344.6,391.5l0.8-4.5c0.3-1.7,1.6-2.8,3.1-2.5l37.6,6.4c1.5,0.3,2.4,1.7,2.1,3.4l-0.8,4.5L344.6,391.5z"></path>
+            <circle class="st7" cx="349" cy="388.4" r="1"></circle>
+            <circle class="st7" cx="353.1" cy="389.1" r="1"></circle>
+            <circle class="st7" cx="357.1" cy="389.8" r="1"></circle>
+            <line class="st8" x1="360.4" y1="402.8" x2="367.4" y2="412.7"></line>
+            <line class="st8" x1="368.8" y1="404.3" x2="359" y2="411.2"></line>
+            <path class="st6" d="M166.4,401.4l-36.6-10.8c-1.5-0.4-2.3-1.8-1.9-3.1l7.7-26.1c0.4-1.3,1.8-2,3.3-1.6l36.6,10.8 c1.5,0.4,2.3,1.8,1.9,3.1l-7.7,26.1C169.3,401.1,167.9,401.8,166.4,401.4z"></path>
+            <path class="st6" d="M134.2,366.2l1.3-4.4c0.5-1.6,2-2.6,3.4-2.1l36.6,10.8c1.5,0.4,2.2,2,1.7,3.6l-1.3,4.4L134.2,366.2z"></path>
+            <circle class="st7" cx="138.9" cy="363.7" r="1"></circle>
+            <circle class="st7" cx="142.9" cy="364.8" r="1"></circle>
+            <circle class="st7" cx="146.9" cy="366" r="1"></circle>
+            <path class="st6" d="M220.9,399.3l-38-3.9c-1.5-0.2-2.5-1.3-2.4-2.7l2.8-27.1c0.1-1.4,1.4-2.3,2.9-2.2l38,3.9 c1.5,0.2,2.5,1.3,2.4,2.7l-2.8,27.1C223.6,398.5,222.4,399.5,220.9,399.3z"></path>
+            <path class="st6" d="M188.6,400.9l-38.1,2.8c-1.5,0.1-2.7-0.9-2.8-2.3l-2-27.1c-0.1-1.4,1-2.6,2.5-2.7l38.1-2.8 c1.5-0.1,2.7,0.9,2.8,2.3l2,27.1C191.2,399.6,190.1,400.8,188.6,400.9z"></path>
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+            <circle class="st7" cx="149.6" cy="375.3" r="1"></circle>
+            <circle class="st7" cx="153.7" cy="375" r="1"></circle>
+            <circle class="st7" cx="157.8" cy="374.7" r="1"></circle>
+            <line class="st8" x1="164.1" y1="386.6" x2="173.3" y2="394.4"></line>
+            <line class="st8" x1="172.7" y1="385.9" x2="164.8" y2="395.1"></line>
+            <path class="st10" d="M539.1,267.8c0,96.1-51.7,97.6-67.6,98.6c-28.1,1.8-76.3-14.4-63-25.6c13.3-11.2,53.8-10.3,59.3-4.3 c4,4.3,6.1,16.6-49.9,15.8c-29.4-0.4-51-8.4-60.8-32.1"></path>
+            <path class="st11" d="M184.1,262.5c17.8,9,28.4-2.4,28.4-2.4"></path>
+            <ellipse class="st0" cx="289.7" cy="170.7" rx="77.1" ry="21.7"></ellipse>
+            <path class="st12" d="M366.8,308.7c0,12.1-34.5,21.8-77.1,21.8c-42.6,0-77.1-9.8-77.1-21.8V170.7c0,12.1,34.5,21.8,77.1,21.8 c42.6,0,77.1-9.8,77.1-21.8V308.7z"></path>
+            <path class="st13" d="M212.6,170.7c0-12.1,34.5-21.8,77.1-21.8c42.6,0,77.1,9.8,77.1,21.8"></path>
+            <path class="st13" d="M366.8,216.7c0,12.1-34.5,21.8-77.1,21.8c-42.6,0-77.1-9.8-77.1-21.8"></path>
+            <path class="st13" d="M366.8,262.7c0,12.1-34.5,21.8-77.1,21.8c-42.6,0-77.1-9.8-77.1-21.8"></path>
+            <path class="st11" d="M384.2,279.8c-6.2-18.9-25.1-18.7-25.1-18.7"></path>
+            <path class="st14" d="M378,288.7c0,0,0-6.3,5.6-8.8c0,0,1.6,0.5,3.3,1.3"></path>
+            <path class="st15" d="M384.2,279.8"></path>
+            <circle class="st4" cx="319" cy="254.8" r="4.2"></circle>
+            <circle class="st4" cx="257.2" cy="255.4" r="4.2"></circle>
+            <line class="st16" x1="182.4" y1="284.4" x2="179" y2="229.2"></line>
+            <polygon class="st17" points="191.3,144 153.6,146.3 128.7,174.8 131,212.7 159.3,238 196.9,235.6 221.8,207.2 219.5,169.2" style="fill:var(--color-bg-sign)"></polygon>
+            <text class="error-code" x="125" y="220" transform="rotate(-5)">{{ code }}</text>
+            <line class="st14" x1="183.2" y1="255.9" x2="175.9" y2="258.8"></line>
+            <line class="st14" x1="184.7" y1="260.4" x2="175.8" y2="263"></line>
+            <line class="st14" x1="185.4" y1="265.4" x2="176.9" y2="267.2"></line>
+            <ellipse class="st11" cx="287.7" cy="269" rx="4.4" ry="6.7"></ellipse>
+            <path class="st6" d="M405.5,316l-37.8,5.5c-1.5,0.2-2.8-0.7-3-2.1l-3.9-26.9c-0.2-1.4,0.8-2.6,2.3-2.8l37.8-5.5 c1.5-0.2,2.8,0.7,3,2.1l3.9,26.9C407.9,314.5,407,315.7,405.5,316z"></path>
+            <path class="st6" d="M361.5,297.6l-0.7-4.5c-0.2-1.7,0.7-3.1,2.2-3.4l37.8-5.5c1.5-0.2,2.8,0.9,3.1,2.6l0.7,4.5L361.5,297.6z"></path>
+            <circle class="st7" cx="364.7" cy="293.3" r="1"></circle>
+            <circle class="st7" cx="368.8" cy="292.7" r="1"></circle>
+            <circle class="st7" cx="372.9" cy="292.1" r="1"></circle>
+            <line class="st19" x1="380" y1="303.4" x2="389.7" y2="310.6"></line>
+            <line class="st19" x1="388.5" y1="302.2" x2="381.3" y2="311.9"></line>
+            <path class="st6" d="M204.8,355.2l-28.4,25.5c-1.1,1-2.7,1-3.6-0.1l-18.2-20.3c-0.9-1-0.8-2.6,0.3-3.6l28.4-25.5 c1.1-1,2.7-1,3.6,0.1l18.2,20.3C206.1,352.6,205.9,354.2,204.8,355.2z"></path>
+            <path class="st9" d="M158,364.1l-3-3.4c-1.1-1.3-1.1-3,0-4l28.4-25.5c1.1-1,2.9-0.8,4,0.5l3,3.4L158,364.1z"></path>
+            <circle class="st7" cx="158.3" cy="358.7" r="1"></circle>
+            <circle class="st7" cx="161.3" cy="356" r="1"></circle>
+            <circle class="st7" cx="164.4" cy="353.2" r="1"></circle>
+            <line class="st8" x1="176.7" y1="358.8" x2="188.7" y2="359.4"></line>
+            <line class="st8" x1="183" y1="353.1" x2="182.4" y2="365.1"></line>
+            <path class="st6" d="M219.9,344l14.8,35.2c0.6,1.4,0,2.9-1.2,3.4l-25.1,10.5c-1.3,0.5-2.7-0.1-3.3-1.5l-14.8-35.2 c-0.6-1.4,0-2.9,1.2-3.4l25.1-10.5C217.8,341.9,219.3,342.6,219.9,344z"></path>
+            <path class="st9" d="M213,391.1l-4.2,1.8c-1.6,0.7-3.2,0.1-3.8-1.3l-14.8-35.2c-0.6-1.4,0.2-3,1.7-3.6l4.2-1.8L213,391.1z"></path>
+            <circle class="st7" cx="208" cy="389.1" r="1"></circle>
+            <circle class="st7" cx="206.4" cy="385.3" r="1"></circle>
+            <circle class="st7" cx="204.8" cy="381.5" r="1"></circle>
+            <line class="st8" x1="214.1" y1="371.7" x2="218.6" y2="360.6"></line>
+            <line class="st8" x1="210.8" y1="363.9" x2="221.9" y2="368.4"></line>
+            <path class="st14" d="M394.1,287.1c-0.7-1.6-3.9-4.5-7.2-5.9"></path>
+            <path class="st6" d="M419.7,413.7l-37.8,5.2c-1.5,0.2-2.8-0.7-3-2.1l-3.7-27c-0.2-1.4,0.8-2.6,2.3-2.8l37.8-5.2 c1.5-0.2,2.8,0.7,3,2.1l3.7,27C422.2,412.2,421.2,413.5,419.7,413.7z"></path>
+            <path class="st6" d="M375.9,394.8l-0.6-4.5c-0.2-1.7,0.7-3.1,2.2-3.3l37.8-5.2c1.5-0.2,2.8,0.9,3.1,2.6l0.6,4.5L375.9,394.8z"></path>
+            <circle class="st7" cx="379.2" cy="390.6" r="1"></circle>
+            <circle class="st7" cx="383.3" cy="390" r="1"></circle>
+            <circle class="st7" cx="387.4" cy="389.5" r="1"></circle>
+            <line class="st8" x1="394.4" y1="400.9" x2="404" y2="408.2"></line>
+            <line class="st8" x1="402.9" y1="399.7" x2="395.6" y2="409.4"></line>
+            <polygon class="st17" points="361,62.2 346.5,104.9 364.7,107.8 347.6,141.8 382,99.7 363.5,93.5 385,63.8 "></polygon>
+            <polygon class="st17" points="396.5,101.6 374.8,122.8 384.1,130.2 363.6,145.4 396.4,130.6 388,121.2 409.5,109.9 "></polygon>
+            <line class="st14" x1="384.7" y1="281.7" x2="386" y2="290.6"></line>
+        </svg>
+    </div>
+</main>
+<script>
+    Array.prototype.forEach.call(document.getElementsByClassName('if-not-found'), function ($el) {
+        $el.style.display = "{{ code }}" === "404" ? 'block' : 'none';
+    });
+
+    Array.prototype.forEach.call(document.getElementsByClassName('if-maybe-wrong-uri'), function ($el) {
+        $el.style.display = ["401", "403", "404", "418", "505"].includes("{{ code }}") ? 'block' : 'none';
+    });
+
+    Array.prototype.forEach.call(document.getElementsByClassName('go-back'), function ($el) {
+        if (document.referrer !== '' || history.length > 1) {
+            $el.setAttribute('href', '#back-to-the-future');
+
+            $el.addEventListener('click', function (event) {
+                history.back();
+                event.preventDefault();
+
+                return false;
+            }, false);
+
+            $el.style.display = 'inline-block'; // show the element
+        } else {
+            $el.style.display = 'none'; // hide the element
+        }
+    });
+
+    if (navigator.language.substring(0, 2).toLowerCase() !== 'en') {
+        ((s, p) => { // localize the page (details here - https://github.com/tarampampam/error-pages/tree/master/l10n)
+            s.src = 'https://cdn.jsdelivr.net/gh/tarampampam/error-pages@2/l10n/l10n.min.js'; // '../l10n/l10n.js';
+            s.async = s.defer = true;
+            s.addEventListener('load', () => p.removeChild(s));
+            p.appendChild(s);
+        })(document.createElement('script'), document.body);
+    }
+</script>
+</body>
+<!--
+    Error {{ code }}: {{ message }}
+    Description: {{ description }}
+-->
+</html>

templates/cats.html

@@ -0,0 +1,121 @@
+<!DOCTYPE html>
+<!--
+    Error {{ code }}: {{ message }}
+    Description: {{ description }}
+-->
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <meta name="robots" content="noindex, nofollow"/>
+    <title>{{ message }}</title>
+    <style>
+        html, body {
+            margin: 0;
+            height: 100vh;
+            background-color: #000;
+            color: #ddd;
+            font-family: 'Open Sans', sans-serif;
+            font-size: 0;
+        }
+
+        .centered {
+            height: 100vh;
+            align-items: center;
+            display: flex;
+            justify-content: center
+        }
+
+        .centered img {
+            max-width: 750px;
+            width: 100%;
+        }
+
+        /* {{ if show_details }} */
+        .details table {
+            width: 100%;
+        }
+
+        .details td {
+            font-size: 11px;
+        }
+
+        .details td.name {
+            text-align: right;
+            padding-right: .6em;
+            width: 50%;
+        }
+
+        .details td.value {
+            text-align: left;
+            padding-left: .6em;
+            font-family: 'Lucida Console', 'Courier New', monospace;
+        }
+        /* {{ end }} */
+    </style>
+</head>
+<body>
+<div class="centered">
+    <!-- Pictures provider: <https://http.cat/> -->
+    <div>
+        <img src="https://http.cat/{{ code }}.jpg" alt="{{ message }}">
+        {{ if show_details }}
+        <div class="details">
+            <table>
+                {{- if host }}<tr>
+                    <td class="name" data-l10n>Host</td>
+                    <td class="value">{{ host }}</td>
+                </tr>{{ end -}}
+                {{- if original_uri }}<tr>
+                    <td class="name" data-l10n>Original URI</td>
+                    <td class="value">{{ original_uri }}</td>
+                </tr>{{ end -}}
+                {{- if forwarded_for }}<tr>
+                    <td class="name" data-l10n>Forwarded for</td>
+                    <td class="value">{{ forwarded_for }}</td>
+                </tr>{{ end -}}
+                {{- if namespace }}<tr>
+                    <td class="name" data-l10n>Namespace</td>
+                    <td class="value">{{ namespace }}</td>
+                </tr>{{ end -}}
+                {{- if ingress_name }}<tr>
+                    <td class="name" data-l10n>Ingress name</td>
+                    <td class="value">{{ ingress_name }}</td>
+                </tr>{{ end -}}
+                {{- if service_name }}<tr>
+                    <td class="name" data-l10n>Service name</td>
+                    <td class="value">{{ service_name }}</td>
+                </tr>{{ end -}}
+                {{- if service_port }}<tr>
+                    <td class="name" data-l10n>Service port</td>
+                    <td class="value">{{ service_port }}</td>
+                </tr>{{ end -}}
+                {{- if request_id }}<tr>
+                    <td class="name" data-l10n>Request ID</td>
+                    <td class="value">{{ request_id }}</td>
+                </tr>{{ end -}}
+                <tr>
+                    <td class="name" data-l10n>Timestamp</td>
+                    <td class="value">{{ now.Unix }}</td>
+                </tr>
+            </table>
+        </div>
+        {{ end }}
+    </div>
+</div>
+<script>
+    if (navigator.language.substring(0, 2).toLowerCase() !== 'en') {
+        ((s, p) => { // localize the page (details here - https://github.com/tarampampam/error-pages/tree/master/l10n)
+            s.src = 'https://cdn.jsdelivr.net/gh/tarampampam/error-pages@2/l10n/l10n.min.js'; // '../l10n/l10n.js';
+            s.async = s.defer = true;
+            s.addEventListener('load', () => p.removeChild(s));
+            p.appendChild(s);
+        })(document.createElement('script'), document.body);
+    }
+</script>
+</body>
+<!--
+    Error {{ code }}: {{ message }}
+    Description: {{ description }}
+-->
+</html>

templates/connection.html

@@ -0,0 +1,270 @@
+<!DOCTYPE html>
+<!--
+    Error {{ code }}: {{ message }}
+    Description: {{ description }}
+-->
+<html lang="en">
+<head>
+    <meta charset="utf-8"/>
+    <meta name="viewport" content="width=device-width, initial-scale=1"/>
+    <meta name="robots" content="noindex, nofollow"/>
+    <meta http-equiv="X-UA-Compatible" content="IE=edge"/>
+    <title>{{ code }} | {{ message }}</title>
+    <link rel="preconnect" href="https://fonts.gstatic.com"/>
+    <link href="https://fonts.googleapis.com/css2?family=Red+Hat+Display:wght@500&family=Fira+Mono&family=Ubuntu&display=swap" rel="stylesheet"/>
+    <style>
+        /** Idea author: https://github.com/186526/CloudflareCustomErrorPage */
+        :root{--color-bg-primary:#fff;--color-text-primary:#000;--color-text-secondary:#575958;--font-size-primary:56px;--font-size-secondary:20px;--ui-card-color-bg:#f2f2f2;--color-text-ok:#137333;--color-bg-ok:#e6f4ea;--color-text-error:#c5221f;--color-bg-error:#fce8e6;--color-text-warning:#b05a00;--color-bg-warning:#fef7e0;--icon-size:48px}
+        @media (prefers-color-scheme:dark){
+            :root{--color-bg-primary:#111;--color-text-primary:rgba(255, 255, 255, 0.86);--color-text-secondary:rgba(255, 255, 255, 0.4);--ui-card-color-bg:rgba(40, 40, 40, 0.73);--color-bg-ok:#07220f;--color-bg-error:#270501;--color-bg-warning:#392605}
+        }
+        body{margin:2rem 2rem;font-family:'Red Hat Display',Ubuntu,Roboto,'Noto Sans SC',sans-serif;color:var(--color-text-primary);background-color:var(--color-bg-primary)}
+        header{margin-left:1rem}
+        header .error-code{font-size:var(--font-size-primary);line-height:var(--font-size-primary);font-family:'Fira Mono',Ubuntu,monospace;font-weight:400;margin:0 0 0 10px}
+        header .error-description{font-family:Ubuntu,Roboto,'Noto Sans SC',sans-serif;font-size:var(--font-size-secondary);color:var(--color-text-secondary);margin:0 0 0 10px}
+        code{font-family:'Fira Mono',monospace}
+        .status{margin-top:2.5rem;display:flex;flex-direction:row;flex-wrap:wrap;justify-content:center;align-items:center}
+        .card{background-color:var(--ui-card-color-bg);padding:2rem;margin:1rem 1rem;min-height:3rem;border-radius:9px;flex-grow:1}
+        .arrows svg{fill:var(--color-text-secondary)}
+        .icon svg{width:var(--icon-size);height:auto;fill:var(--color-text-primary)}
+        .card.ok{background-color:var(--color-bg-ok)}.card.ok .status-text{color:var(--color-text-ok)}.card.ok svg{fill:var(--color-text-ok)}
+        .card.error{background-color:var(--color-bg-error)}.card.error .status-text{color:var(--color-text-error)}.card.error svg{fill:var(--color-text-error)}
+        .card.warning{background-color:var(--color-bg-warning)}.card.warning .status-text{color:var(--color-text-warning)}.card.warning svg{fill:var(--color-text-warning)}
+        .card main{font-size:calc(var(--font-size-secondary) + .1rem)}
+        .card .status-text,.reason p{margin:0;font-family:Ubuntu,Roboto,Noto Sans SC,sans-serif}
+        .reason p{line-height:125%}
+        a{text-decoration:none;color:#1967d2}
+        .reason{display:flex;flex-direction:row;flex-wrap:wrap;justify-content:space-between;align-items:baseline}
+        .reason>*{display:block;margin:1rem;flex-grow:1;max-width:40%}
+        .reason h2{font-size:calc(var(--font-size-secondary) + .2rem);margin:0 0 .6em 0;font-weight:550}
+        footer{margin:1rem;color:var(--color-text-secondary);font-size:0}
+        /* {{ if show_details }} */
+        footer .details{margin-top:20px}
+        footer .details ul{padding:0}
+        footer .details code,footer .details span{font-size:calc(var(--font-size-secondary) - .6rem)}
+        footer .details code{padding-left:7px}
+        /* {{ end }} */
+        @media screen and (max-width:820px){
+            .arrows{display:none}
+        }
+        @media screen and (max-width:480px){
+            .reason>*{max-width:100%}
+            /* {{ if show_details }} */
+            footer .details code,footer .details span{font-size:calc(var(--font-size-secondary) - .3rem)}
+            /* {{ end }} */
+        }
+        @media screen and (min-width:768px){
+            body{margin:8% 10%}
+            header>*{display:inline-block;margin-left:1%}
+        }
+    </style>
+</head>
+<body>
+<header>
+    <h1 class="error-code">{{ code }}</h1>
+    <p class="error-description">{{ message }}</p>
+</header>
+<div class="status">
+    <div class="card warning" id="client-status-card">
+        <i class="icon">
+            <svg xmlns="http://www.w3.org/2000/svg" height="24px" viewBox="0 0 24 24" width="24px" fill="#000000">
+                <path d="M0 0h24v24H0V0z" fill="none"/>
+                <path d="M19 4H5c-1.11 0-2 .9-2 2v12c0 1.1.89 2 2 2h14c1.1 0 2-.9 2-2V6c0-1.1-.89-2-2-2zm0 14H5V8h14v10z"/>
+            </svg>
+        </i>
+        <main data-l10n>Your Client</main>
+        <p class="status-text" data-l10n>Unknown</p>
+    </div>
+
+    <div class="arrows">
+        <svg xmlns="http://www.w3.org/2000/svg" height="24px" width="24px" fill="#000000">
+            <defs>
+                <symbol id="arrows-horizontal" viewBox="0 0 24 24">
+                    <rect fill="none" height="24" width="24" x="0"/>
+                    <polygon points="7.41,13.41 6,12 2,16 6,20 7.41,18.59 5.83,17 21,17 21,15 5.83,15"/>
+                    <polygon points="16.59,10.59 18,12 22,8 18,4 16.59,5.41 18.17,7 3,7 3,9 18.17,9"/>
+                </symbol>
+            </defs>
+            <use href="#arrows-horizontal"/>
+        </svg>
+    </div>
+
+    <div class="card ok" id="network-status-card">
+        <i class="icon">
+            <svg xmlns="http://www.w3.org/2000/svg" height="24px" viewBox="0 0 24 24" width="24px" fill="#000000">
+                <path d="M0 0h24v24H0V0z" fill="none"/>
+                <path d="M12 6c2.62 0 4.88 1.86 5.39 4.43l.3 1.5 1.53.11c1.56.1 2.78 1.41 2.78 2.96 0 1.65-1.35 3-3 3H6c-2.21 0-4-1.79-4-4 0-2.05 1.53-3.76 3.56-3.97l1.07-.11.5-.95C8.08 7.14 9.94 6 12 6m0-2C9.11 4 6.6 5.64 5.35 8.04 2.34 8.36 0 10.91 0 14c0 3.31 2.69 6 6 6h13c2.76 0 5-2.24 5-5 0-2.64-2.05-4.78-4.65-4.96C18.67 6.59 15.64 4 12 4z"/>
+            </svg>
+        </i>
+        <main data-l10n>Network</main>
+        <p class="status-text" data-l10n>Working</p>
+    </div>
+
+    <div class="arrows">
+        <svg xmlns="http://www.w3.org/2000/svg" height="24px" width="24px" fill="#000000">
+            <use href="#arrows-horizontal" />
+        </svg>
+    </div>
+
+    <div class="card warning" id="server-status-card">
+        <i class="icon">
+            <svg xmlns="http://www.w3.org/2000/svg" height="24px" viewBox="0 0 24 24" width="24px" fill="#000000">
+                <path d="M0 0h24v24H0V0z" fill="none"/>
+                <path d="M19 15v4H5v-4h14m1-2H4c-.55 0-1 .45-1 1v6c0 .55.45 1 1 1h16c.55 0 1-.45 1-1v-6c0-.55-.45-1-1-1zM7 18.5c-.82 0-1.5-.67-1.5-1.5s.68-1.5 1.5-1.5 1.5.67 1.5 1.5-.67 1.5-1.5 1.5zM19 5v4H5V5h14m1-2H4c-.55 0-1 .45-1 1v6c0 .55.45 1 1 1h16c.55 0 1-.45 1-1V4c0-.55-.45-1-1-1zM7 8.5c-.82 0-1.5-.67-1.5-1.5S6.18 5.5 7 5.5s1.5.68 1.5 1.5S7.83 8.5 7 8.5z"/>
+            </svg>
+        </i>
+        <main data-l10n>Web Server</main>
+        <p class="status-text" data-l10n>Unknown</p>
+    </div>
+</div>
+<div class="reason">
+    <div class="what-happened">
+        <h2 data-l10n>What happened?</h2>
+        <p class="description" data-l10n>{{ description }}</p>
+    </div>
+    <div class="what-can-i-do">
+        <h2 data-l10n>What can I do?</h2>
+        <p class="description" data-l10n>Please try again in a few minutes</p>
+    </div>
+</div>
+</body>
+<footer>
+    {{ if show_details }}
+    <div class="details">
+        <ul>
+            {{- if host }}<li><span><span data-l10n>Host</span>:</span> <code>{{ host }}</code></li>{{ end -}}
+            {{- if original_uri }}<li><span><span data-l10n>Original URI</span>:</span> <code>{{ original_uri }}</code></li>{{ end -}}
+            {{- if forwarded_for }}<li><span><span data-l10n>Forwarded for</span>:</span> <code>{{ forwarded_for }}</code></li>{{ end -}}
+            {{- if namespace }}<li><span><span data-l10n>Namespace</span>:</span> <code>{{ namespace }}</code></li>{{ end -}}
+            {{- if ingress_name }}<li><span><span data-l10n>Ingress name</span>:</span> <code>{{ ingress_name }}</code></li>{{ end -}}
+            {{- if service_name }}<li><span><span data-l10n>Service name</span>:</span> <code>{{ service_name }}</code></li>{{ end -}}
+            {{- if service_port }}<li><span><span data-l10n>Service port</span>:</span> <code>{{ service_port }}</code></li>{{ end -}}
+            {{- if request_id }}<li><span><span data-l10n>Request ID</span>:</span> <code>{{ request_id }}</code></li>{{ end -}}
+            <li><span><span data-l10n>Timestamp</span>:</span> <code>{{ now.Unix }}</code></li>
+        </ul>
+    </div>
+    {{ end }}
+</footer>
+<script>
+    const errorCode = parseInt(`{{ code }}`, 10);
+
+    if (typeof errorCode !== 'undefined' && !isNaN(errorCode)) {
+        /**
+         * @param {HTMLElement} $card
+         * @param { {isOk?: boolean, isWarning?: boolean, isError?: boolean} } state
+         * @param {string} statusText
+         */
+        const setCardState = function ($card, state, statusText) {
+            const okClass = 'ok', warnClass = 'warning', errClass = 'error',
+                $statusText = $card.querySelectorAll('.status-text');
+
+            switch (true) {
+                case state.isOk === true:
+                    $card.classList.remove(errClass, warnClass);
+                    $card.classList.add(okClass);
+                    $statusText.forEach(($statusText) => $statusText.innerText = statusText);
+                    break;
+
+                case state.isWarning === true:
+                    $card.classList.remove(okClass, errClass);
+                    $card.classList.add(warnClass);
+                    $statusText.forEach(($statusText) => $statusText.innerText = statusText);
+                    break;
+
+                case state.isError === true:
+                    $card.classList.remove(okClass, warnClass);
+                    $card.classList.add(errClass);
+                    $statusText.forEach(($statusText) => $statusText.innerText = statusText);
+                    break;
+            }
+        };
+
+        /**
+         * @param { {whatHappened?: string, whatToDo?: string} } reasons
+         */
+        const setReasons = function (reasons) {
+            const descSelector = '.description';
+
+            Array.prototype.forEach.call(document.getElementsByClassName('what-happened'), ($el) => {
+                if (typeof reasons.whatHappened === 'string' && reasons.whatHappened.length > 0) {
+                    Array.prototype.forEach.call($el.querySelectorAll(descSelector), ($desc)  => $desc.innerText = reasons.whatHappened);
+                } else {
+                    $el.remove();
+                }
+            });
+
+            Array.prototype.forEach.call(document.getElementsByClassName('what-can-i-do'), ($el) => {
+                if (typeof reasons.whatToDo === 'string' && reasons.whatToDo.length > 0) {
+                    Array.prototype.forEach.call($el.querySelectorAll(descSelector), ($desc)  => $desc.innerText = reasons.whatToDo);
+                } else {
+                    $el.remove();
+                }
+            });
+        };
+
+        /**
+         * @param {string} text
+         */
+        const setErrorDescription = function (text) {
+            Array.prototype.forEach.call(document.getElementsByClassName('error-description'), function ($el) {
+                $el.innerHTML = text;
+            });
+        };
+
+        const message = `{{ message }}`.trim(), cards = {
+            $client: document.getElementById('client-status-card'),
+            $network: document.getElementById('network-status-card'),
+            $server: document.getElementById('server-status-card'),
+        };
+
+        let whatToDo = 'Please try again in a few minutes';
+
+        switch (true) {
+            case errorCode >= 400 && errorCode <= 499:
+                switch (errorCode) {
+                    case 400: case 405: case 411: case 413: whatToDo = 'Please try to change the request method, headers, payload, or URL'; break;
+                    case 401: case 403: case 407: whatToDo = 'Please check your authorization data'; break;
+                    case 404: whatToDo = 'Please double-check the URL and try again'; break;
+                    case 409: case 410: case 418: whatToDo = '¯\\_(ツ)_/¯'; break;
+                }
+
+                setErrorDescription(`<span data-l10n>${message}</span> (<span data-l10n>client-side error</span>)`);
+                setCardState(cards.$client, {isError: true}, message)
+                setCardState(cards.$network, {isOk: true}, 'Working')
+                setCardState(cards.$server, {isOk: true}, 'Working')
+                break;
+
+            case errorCode >= 500 && errorCode <= 599:
+                setErrorDescription(`<span data-l10n>${message}</span> (<span data-l10n>server-side error</span>)`);
+                setCardState(cards.$client, {isOk: true}, 'Working')
+                setCardState(cards.$network, {isOk: true}, 'Working')
+                setCardState(cards.$server, {isError: true}, message)
+                break;
+
+            default:
+                setErrorDescription(message);
+                setCardState(cards.$client, {isWarning: true}, 'Unknown')
+                setCardState(cards.$network, {isOk: true}, 'Working')
+                setCardState(cards.$server, {isWarning: true}, 'Unknown')
+                break;
+        }
+
+        setReasons({whatHappened: `{{ description }}`.trim(), whatToDo: whatToDo.trim()});
+    } else {
+        console.warn('Cannot parse the error code:', errorCode);
+    }
+
+    if (navigator.language.substring(0, 2).toLowerCase() !== 'en') {
+        ((s, p) => { // localize the page (details here - https://github.com/tarampampam/error-pages/tree/master/l10n)
+            s.src = 'https://cdn.jsdelivr.net/gh/tarampampam/error-pages@2/l10n/l10n.min.js'; // '../l10n/l10n.js';
+            s.async = s.defer = true;
+            s.addEventListener('load', () => p.removeChild(s));
+            p.appendChild(s);
+        })(document.createElement('script'), document.body);
+    }
+</script>
+<!--
+    Error {{ code }}: {{ message }}
+    Description: {{ description }}
+-->
+</html>

templates/ghost.html

@@ -9,22 +9,32 @@
     <meta name="robots" content="noindex, nofollow" />
     <title>{{ code }}: {{ message }}</title>
     <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1" />
-    <link href="https://fonts.googleapis.com/css?family=Open+Sans" rel="stylesheet" />
+    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
+    <link href="https://fonts.googleapis.com/css2?family=Open+Sans:wght@400;700&display=swap" rel="stylesheet">
     <style>
-        html,body {background-color:#1a1a1a;color:#fff;font-family:'Open Sans',sans-serif}
-        .wrap {top:50%;left:50%;width:310px;height:260px;margin-left:-155px;margin-top:-110px;position:absolute;text-align:center}
+        html,body {background-color:#1a1a1a;color:#fff;font-family:'Open Sans',sans-serif;height:100vh;margin:0;font-size:0}
+        .container {height:100vh;align-items:center;display:flex;justify-content:center;position:relative}
+        .wrap {text-align:center}
         .ghost {animation:float 3s ease-out infinite}
         @keyframes float { 50% {transform:translate(0,20px)}}
         .shadowFrame {width:130px;margin: 10px auto 0 auto}
         .shadow {animation:shrink 3s ease-out infinite;transform-origin:center center}
         @keyframes shrink {0%{width:90%;margin:0 5%} 50% {width:60%;margin:0 18%} 100% {width:90%;margin:0 5%}}
-        h3 {font-size:1.05em;text-transform: uppercase;margin:0.3em auto}
-        .description {font-size:0.8em;color:#aaa}
+        h3 {font-size:17px;text-transform: uppercase;margin:0.3em auto}
+        .description {font-size:13px;color:#aaa}
+        /* {{ if show_details }} */
+        .details {color:#999;width:100%}
+        .details table {width:100%}
+        .details td {white-space:nowrap;font-size:11px}
+        .details .name {text-align:right;padding-right:.6em;width:50%}
+        .details .value {text-align:left;padding-left:.6em;font-family:'Lucida Console','Courier New',monospace}
+        /* {{ end }} */
     </style>
 </head>
 <body>
+<div class="container">
     <div class="wrap">
-    <svg class="ghost" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="127.433px" height="132.743px" viewBox="0 0 127.433 132.743" enable-background="new 0 0 127.433 132.743" xml:space="preserve">
+        <svg class="ghost" xmlns="http://www.w3.org/2000/svg" x="0px" y="0px" width="127.433px" height="132.743px" viewBox="0 0 127.433 132.743" xml:space="preserve">
           <path fill="#FFF6F4" d="M116.223,125.064c1.032-1.183,1.323-2.73,1.391-3.747V54.76c0,0-4.625-34.875-36.125-44.375 s-66,6.625-72.125,44l-0.781,63.219c0.062,4.197,1.105,6.177,1.808,7.006c1.94,1.811,5.408,3.465,10.099-0.6 c7.5-6.5,8.375-10,12.75-6.875s5.875,9.75,13.625,9.25s12.75-9,13.75-9.625s4.375-1.875,7,1.25s5.375,8.25,12.875,7.875 s12.625-8.375,12.625-8.375s2.25-3.875,7.25,0.375s7.625,9.75,14.375,8.125C114.739,126.01,115.412,125.902,116.223,125.064z"></path>
             <circle fill="#1a1a1a" cx="86.238" cy="57.885" r="6.667"></circle>
             <circle fill="#1a1a1a" cx="40.072" cy="57.885" r="6.667"></circle>
@@ -37,13 +47,66 @@
             <path fill="#FCEFED" stroke="#FEEBE6" stroke-miterlimit="10" d="M116.279,55.814c-0.021-0.286-2.323-28.744-30.221-41.012 c-7.806-3.433-15.777-5.173-23.691-5.173c-16.889,0-30.283,7.783-37.187,15.067c-9.229,9.736-13.84,26.712-14.191,30.259 l-0.748,62.332c0.149,2.133,1.389,6.167,5.019,6.167c1.891,0,4.074-1.083,6.672-3.311c4.96-4.251,7.424-6.295,9.226-6.295 c1.339,0,2.712,1.213,5.102,3.762c4.121,4.396,7.461,6.355,10.833,6.355c2.713,0,5.311-1.296,7.942-3.962 c3.104-3.145,5.701-5.239,8.285-5.239c2.116,0,4.441,1.421,7.317,4.473c2.638,2.8,5.674,4.219,9.022,4.219 c4.835,0,8.991-2.959,11.27-5.728l0.086-0.104c1.809-2.2,3.237-3.938,5.312-3.938c2.208,0,5.271,1.942,9.359,5.936 c0.54,0.743,3.552,4.674,6.86,4.674c1.37,0,2.559-0.65,3.531-1.932l0.203-0.268L116.279,55.814z M114.281,121.405 c-0.526,0.599-1.096,0.891-1.734,0.891c-2.053,0-4.51-2.82-5.283-3.907l-0.116-0.136c-4.638-4.541-7.975-6.566-10.82-6.566 c-3.021,0-4.884,2.267-6.857,4.667l-0.086,0.104c-1.896,2.307-5.582,4.999-9.725,4.999c-2.775,0-5.322-1.208-7.567-3.59 c-3.325-3.528-6.03-5.102-8.772-5.102c-3.278,0-6.251,2.332-9.708,5.835c-2.236,2.265-4.368,3.366-6.518,3.366 c-2.772,0-5.664-1.765-9.374-5.723c-2.488-2.654-4.29-4.395-6.561-4.395c-2.515,0-5.045,2.077-10.527,6.777 c-2.727,2.337-4.426,2.828-5.37,2.828c-2.662,0-3.017-4.225-3.021-4.225l0.745-62.163c0.332-3.321,4.767-19.625,13.647-28.995 c3.893-4.106,10.387-8.632,18.602-11.504c-0.458,0.503-0.744,1.165-0.744,1.898c0,1.565,1.269,2.833,2.833,2.833 c1.564,0,2.833-1.269,2.833-2.833c0-1.355-0.954-2.485-2.226-2.764c4.419-1.285,9.269-2.074,14.437-2.074 c7.636,0,15.336,1.684,22.887,5.004c26.766,11.771,29.011,39.047,29.027,39.251V121.405z"></path>
         </svg>
         <p class="shadowFrame">
-        <svg version="1.1" class="shadow" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="61px" y="20px" width="122.436px" height="39.744px" viewBox="0 0 122.436 39.744" enable-background="new 0 0 122.436 39.744" xml:space="preserve">
+            <svg class="shadow" xmlns="http://www.w3.org/2000/svg" x="61px" y="20px" width="122.436px" height="39.744px" viewBox="0 0 122.436 39.744" xml:space="preserve">
             <ellipse fill="#262626" cx="61.128" cy="19.872" rx="49.25" ry="8.916"></ellipse>
           </svg>
         </p>
-    <h3>Error {{ code }}</h3>
-    <p class="description">{{ description }}</p>
+        <h3><span data-l10n>Error</span> {{ code }}</h3>
+        <p class="description" data-l10n>{{ description }}</p>
+        {{ if show_details }}
+        <div class="details">
+            <table>
+                {{- if host }}<tr>
+                    <td class="name" data-l10n>Host</td>
+                    <td class="value">{{ host }}</td>
+                </tr>{{ end -}}
+                {{- if original_uri }}<tr>
+                    <td class="name" data-l10n>Original URI</td>
+                    <td class="value">{{ original_uri }}</td>
+                </tr>{{ end -}}
+                {{- if forwarded_for }}<tr>
+                    <td class="name" data-l10n>Forwarded for</td>
+                    <td class="value">{{ forwarded_for }}</td>
+                </tr>{{ end -}}
+                {{- if namespace }}<tr>
+                    <td class="name" data-l10n>Namespace</td>
+                    <td class="value">{{ namespace }}</td>
+                </tr>{{ end -}}
+                {{- if ingress_name }}<tr>
+                    <td class="name" data-l10n>Ingress name</td>
+                    <td class="value">{{ ingress_name }}</td>
+                </tr>{{ end -}}
+                {{- if service_name }}<tr>
+                    <td class="name" data-l10n>Service name</td>
+                    <td class="value">{{ service_name }}</td>
+                </tr>{{ end -}}
+                {{- if service_port }}<tr>
+                    <td class="name" data-l10n>Service port</td>
+                    <td class="value">{{ service_port }}</td>
+                </tr>{{ end -}}
+                {{- if request_id }}<tr>
+                    <td class="name" data-l10n>Request ID</td>
+                    <td class="value">{{ request_id }}</td>
+                </tr>{{ end -}}
+                <tr>
+                    <td class="name" data-l10n>Timestamp</td>
+                    <td class="value">{{ now.Unix }}</td>
+                </tr>
+            </table>
         </div>
+        {{ end }}
+    </div>
+</div>
+<script>
+    if (navigator.language.substring(0, 2).toLowerCase() !== 'en') {
+        ((s, p) => { // localize the page (details here - https://github.com/tarampampam/error-pages/tree/master/l10n)
+            s.src = 'https://cdn.jsdelivr.net/gh/tarampampam/error-pages@2/l10n/l10n.min.js'; // '../l10n/l10n.js';
+            s.async = s.defer = true;
+            s.addEventListener('load', () => p.removeChild(s));
+            p.appendChild(s);
+        })(document.createElement('script'), document.body);
+    }
+</script>
 </body>
 <!--
     Error {{ code }}: {{ message }}

templates/hacker-terminal.html

@@ -9,8 +9,8 @@
     <meta name="viewport" content="width=device-width, initial-scale=1">
     <meta name="robots" content="noindex, nofollow" />
     <title>{{ message }}</title>
-    <link rel="dns-prefetch" href="//fonts.gstatic.com">
-    <link href="https://fonts.googleapis.com/css?family=Inconsolata" rel="stylesheet">
+    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
+    <link href="https://fonts.googleapis.com/css2?family=Inconsolata:wght@400;700&display=swap" rel="stylesheet">
     <style>
         /** Idea author: https://codepen.io/robinselmer */
         html, body {
@@ -18,6 +18,7 @@
             overflow: hidden;
             margin: 0;
             padding: 0;
+            font-size: 0;
         }
 
         body {
@@ -27,10 +28,9 @@
             background-repeat: no-repeat;
             background-size: cover;
             font-family: 'Inconsolata', Helvetica, sans-serif;
-            font-size: 1.5rem;
             color: rgba(128, 255, 128, 0.8);
             text-shadow:
-                0 0 1ex rgba(51, 255, 51, 1),
+                0 0 11px rgba(51, 255, 51, 1),
                 0 0 2px rgba(255, 255, 255, 0.8);
         }
 
@@ -82,10 +82,18 @@
             height: 100%;
             width: 1000px;
             max-width: 100%;
-            padding: 4rem;
+            padding: 64px;
             text-transform: uppercase;
         }
 
+        h1 {
+            font-size: 48px;
+        }
+
+        p {
+            font-size: 24px;
+        }
+
         .output {
             color: rgba(128, 255, 128, 0.8);
             text-shadow:
@@ -113,15 +121,57 @@
         .error_code {
             color: white;
         }
+
+        /* {{ if show_details }} */
+        .details p {
+            margin-top: .5em;
+            margin-bottom: .5em;
+        }
+
+        .details * {
+            font-size: 15px;
+        }
+
+        .details p::before {
+            content: "$ ";
+        }
+
+        .details code {
+            font-size: 0.9em;
+        }
+        /* {{ end }} */
     </style>
 </head>
 <body>
 <div class="overlay"></div>
 <div class="terminal">
-    <h1>Error <span class="error_code">{{ code }}</span></h1>
-    <p class="output">{{ description }}.</p>
-    <p class="output">Good luck.</p>
+    <h1><span data-l10n>Error</span> <span class="error_code">{{ code }}</span></h1>
+    <p class="output" data-l10n>{{ description }}.</p>
+    <p class="output"><span data-l10n>Good luck</span>.</p>
+    {{ if show_details }}
+    <div class="details">
+        {{- if host }}<p class="output small"><span data-l10n>Host</span>: <code>{{ host }}</code></p>{{ end -}}
+        {{- if original_uri }}<p class="output small"><span data-l10n>Original URI</span>: <code>{{ original_uri }}</code></p>{{ end -}}
+        {{- if forwarded_for }}<p class="output small"><span data-l10n>Forwarded for</span>: <code>{{ forwarded_for }}</code></p>{{ end -}}
+        {{- if namespace }}<p class="output small"><span data-l10n>Namespace</span>: <code>{{ namespace }}</code></p>{{ end -}}
+        {{- if ingress_name }}<p class="output small"><span data-l10n>Ingress name</span>: <code>{{ ingress_name }}</code></p>{{ end -}}
+        {{- if service_name }}<p class="output small"><span data-l10n>Service name</span>: <code>{{ service_name }}</code></p>{{ end -}}
+        {{- if service_port }}<p class="output small"><span data-l10n>Service port</span>: <code>{{ service_port }}</code></p>{{ end -}}
+        {{- if request_id }}<p class="output small"><span data-l10n>Request ID</span>: <code>{{ request_id }}</code></p>{{ end -}}
+        <p class="output small"><span data-l10n>Timestamp</span>: <code>{{ now.Unix }}</code></p>
     </div>
+    {{ end }}
+</div>
+<script>
+    if (navigator.language.substring(0, 2).toLowerCase() !== 'en') {
+        ((s, p) => { // localize the page (details here - https://github.com/tarampampam/error-pages/tree/master/l10n)
+            s.src = 'https://cdn.jsdelivr.net/gh/tarampampam/error-pages@2/l10n/l10n.min.js'; // '../l10n/l10n.js';
+            s.async = s.defer = true;
+            s.addEventListener('load', () => p.removeChild(s));
+            p.appendChild(s);
+        })(document.createElement('script'), document.body);
+    }
+</script>
 </body>
 <!--
     Error {{ code }}: {{ message }}

templates/l7-dark.html

@@ -12,23 +12,85 @@
     <link rel="dns-prefetch" href="//fonts.gstatic.com">
     <link href="https://fonts.googleapis.com/css?family=Nunito" rel="stylesheet">
     <style>
-        html,body {background-color: #222526;color:#fff;font-family:'Nunito',sans-serif;font-weight:100;height:100vh;margin:0}
+        html,body {background-color:#222526;color:#fff;font-family:'Nunito',sans-serif;font-weight:100;height:100vh;margin:0;font-size:0}
         .full-height {height:100vh}
         .flex-center {align-items:center;display:flex;justify-content:center}
         .position-ref {position:relative}
         .code {border-right:2px solid;font-size:26px;padding:0 10px 0 15px;text-align:center}
         .message {font-size:18px;text-align:center;padding:10px}
+        /* {{ if show_details }} */
+        .details table {width:100%;border-collapse:collapse;box-sizing:border-box;margin-top:20px}
+        .details td {font-size:11px;color:#999}
+        .details td.name {text-align:right;padding-right:.6em;width:50%;border-right:2px solid;border-color:#777}
+        .details td.value {text-align:left;padding-left:.6em;font-family:'Lucida Console','Courier New',monospace}
+        /* {{ end }} */
     </style>
 </head>
 <body>
 <div class="flex-center position-ref full-height">
+    <div>
+        <div class="flex-center">
             <div class="code">
                 {{ code }}
             </div>
-    <div class="message">
+            <div class="message" data-l10n>
                 {{ message }}
             </div>
         </div>
+        {{ if show_details }}
+        <div class="details">
+            <table>
+                {{- if host }}<tr>
+                    <td class="name" data-l10n>Host</td>
+                    <td class="value">{{ host }}</td>
+                </tr>{{ end -}}
+                {{- if original_uri }}<tr>
+                    <td class="name" data-l10n>Original URI</td>
+                    <td class="value">{{ original_uri }}</td>
+                </tr>{{ end -}}
+                {{- if forwarded_for }}<tr>
+                    <td class="name" data-l10n>Forwarded for</td>
+                    <td class="value">{{ forwarded_for }}</td>
+                </tr>{{ end -}}
+                {{- if namespace }}<tr>
+                    <td class="name" data-l10n>Namespace</td>
+                    <td class="value">{{ namespace }}</td>
+                </tr>{{ end -}}
+                {{- if ingress_name }}<tr>
+                    <td class="name" data-l10n>Ingress name</td>
+                    <td class="value">{{ ingress_name }}</td>
+                </tr>{{ end -}}
+                {{- if service_name }}<tr>
+                    <td class="name" data-l10n>Service name</td>
+                    <td class="value">{{ service_name }}</td>
+                </tr>{{ end -}}
+                {{- if service_port }}<tr>
+                    <td class="name" data-l10n>Service port</td>
+                    <td class="value">{{ service_port }}</td>
+                </tr>{{ end -}}
+                {{- if request_id }}<tr>
+                    <td class="name" data-l10n>Request ID</td>
+                    <td class="value">{{ request_id }}</td>
+                </tr>{{ end -}}
+                <tr>
+                    <td class="name" data-l10n>Timestamp</td>
+                    <td class="value">{{ now.Unix }}</td>
+                </tr>
+            </table>
+        </div>
+        {{ end }}
+    </div>
+</div>
+<script>
+    if (navigator.language.substring(0, 2).toLowerCase() !== 'en') {
+        ((s, p) => { // localize the page (details here - https://github.com/tarampampam/error-pages/tree/master/l10n)
+            s.src = 'https://cdn.jsdelivr.net/gh/tarampampam/error-pages@2/l10n/l10n.min.js'; // '../l10n/l10n.js';
+            s.async = s.defer = true;
+            s.addEventListener('load', () => p.removeChild(s));
+            p.appendChild(s);
+        })(document.createElement('script'), document.body);
+    }
+</script>
 </body>
 <!--
     Error {{ code }}: {{ message }}

templates/l7-light.html

@@ -12,23 +12,87 @@
     <link rel="dns-prefetch" href="//fonts.gstatic.com">
     <link href="https://fonts.googleapis.com/css?family=Nunito" rel="stylesheet">
     <style>
-        html,body {background-color:#fff;color:#636b6f;font-family:'Nunito',sans-serif;font-weight:100;height:100vh;margin:0}
+        :root {--color-bg-primary:#fff;--color-text-primary:#636b6f;--color-text-secondary:#777}
+        @media (prefers-color-scheme: dark) {:root {--color-bg-primary:#222526;--color-text-primary:#fff;--color-text-secondary:#999}}
+        html,body {background-color:var(--color-bg-primary);color:var(--color-text-primary);font-family:'Nunito',sans-serif;font-weight:100;height:100vh;margin:0;font-size:0}
         .full-height {height:100vh}
         .flex-center {align-items:center;display:flex;justify-content:center}
         .position-ref {position:relative}
         .code {border-right:2px solid;font-size:26px;padding:0 10px 0 15px;text-align:center}
         .message {font-size:18px;text-align:center;padding:10px}
+        /* {{ if show_details }} */
+        .details table {width:100%;border-collapse:collapse;box-sizing:border-box;margin-top:20px}
+        .details td {font-size:11px;color:var(--color-text-secondary)}
+        .details td.name {text-align:right;padding-right:.6em;width:50%;border-right:2px solid;border-color:#aaa}
+        .details td.value {text-align:left;padding-left:.6em;font-family:'Lucida Console','Courier New',monospace}
+        /* {{ end }} */
     </style>
 </head>
 <body>
 <div class="flex-center position-ref full-height">
+    <div>
+        <div class="flex-center">
             <div class="code">
                 {{ code }}
             </div>
-    <div class="message">
+            <div class="message" data-l10n>
                 {{ message }}
             </div>
         </div>
+        {{ if show_details }}
+        <div class="details">
+            <table>
+                {{- if host }}<tr>
+                    <td class="name" data-l10n>Host</td>
+                    <td class="value">{{ host }}</td>
+                </tr>{{ end -}}
+                {{- if original_uri }}<tr>
+                    <td class="name" data-l10n>Original URI</td>
+                    <td class="value">{{ original_uri }}</td>
+                </tr>{{ end -}}
+                {{- if forwarded_for }}<tr>
+                    <td class="name" data-l10n>Forwarded for</td>
+                    <td class="value">{{ forwarded_for }}</td>
+                </tr>{{ end -}}
+                {{- if namespace }}<tr>
+                    <td class="name" data-l10n>Namespace</td>
+                    <td class="value">{{ namespace }}</td>
+                </tr>{{ end -}}
+                {{- if ingress_name }}<tr>
+                    <td class="name" data-l10n>Ingress name</td>
+                    <td class="value">{{ ingress_name }}</td>
+                </tr>{{ end -}}
+                {{- if service_name }}<tr>
+                    <td class="name" data-l10n>Service name</td>
+                    <td class="value">{{ service_name }}</td>
+                </tr>{{ end -}}
+                {{- if service_port }}<tr>
+                    <td class="name" data-l10n>Service port</td>
+                    <td class="value">{{ service_port }}</td>
+                </tr>{{ end -}}
+                {{- if request_id }}<tr>
+                    <td class="name" data-l10n>Request ID</td>
+                    <td class="value">{{ request_id }}</td>
+                </tr>{{ end -}}
+                <tr>
+                    <td class="name" data-l10n>Timestamp</td>
+                    <td class="value">{{ now.Unix }}</td>
+                </tr>
+            </table>
+        </div>
+        {{ end }}
+    </div>
+</div>
+<script>
+    if (navigator.language.substring(0, 2).toLowerCase() !== 'en') {
+        ((s, p) => { // localize the page (details here - https://github.com/tarampampam/error-pages/tree/master/l10n)
+            s.src = 'https://cdn.jsdelivr.net/gh/tarampampam/error-pages@2/l10n/l10n.min.js'; // '../l10n/l10n.js';
+            s.async = s.defer = true;
+            s.addEventListener('load', () => p.removeChild(s));
+            p.appendChild(s);
+        })(document.createElement('script'), document.body);
+    }
+</script>
 </body>
 <!--
     Error {{ code }}: {{ message }}

templates/lost-in-space.html

@@ -0,0 +1,396 @@
+<!DOCTYPE html>
+<!--
+    Error {{ code }}: {{ message }}
+    Description: {{ description }}
+-->
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <meta name="robots" content="noindex, nofollow"/>
+    <title>{{ message }}</title>
+    <meta http-equiv="X-UA-Compatible" content="IE=edge">
+    <link rel="dns-prefetch" href="//fonts.gstatic.com">
+    <link href="https://fonts.googleapis.com/css?family=Nunito+Sans" rel="stylesheet">
+    <style>
+        /** Codepen: https://codepen.io/kdbkapsere/pen/oNXLbqQ */
+
+        :root {
+            --color-bg-primary: #fff;
+            --color-text-primary: #0e0620;
+
+            --color-ui-bg-primary: #0e0620;
+            --color-ui-bg-inverted: #fff;
+        }
+
+        @media (prefers-color-scheme: dark) {
+            :root {
+                --color-bg-primary: #212121;
+                --color-text-primary: #fafafa;
+
+                --color-ui-bg-primary: #fafafa;
+                --color-ui-bg-inverted: #212121;
+            }
+        }
+
+        html,
+        body {
+            height: 100%;
+            background-color: var(--color-bg-primary);
+            color: var(--color-text-primary);
+            font-family: 'Nunito Sans', sans-serif;
+            margin: 0;
+            padding: 0;
+            font-size: 0;
+        }
+
+        body {
+            align-items: center;
+            display: flex;
+            justify-content: center;
+            height: 100vh;
+        }
+
+        main {
+            width: 100%;
+            max-width: 1140px;
+            display: flex;
+            justify-content: space-between;
+        }
+
+        .picture, .content {
+            box-sizing: border-box;
+            width: 50%;
+        }
+
+        .content {
+            padding: 0 40px;
+        }
+
+        svg .dark {
+            stroke: var(--color-ui-bg-primary);
+        }
+
+        svg .fill-dark {
+            fill: var(--color-ui-bg-primary);
+        }
+
+        svg .fill-light {
+            fill: var(--color-ui-bg-inverted);
+        }
+
+        h1 {
+            font-size: 150px;
+            margin: 15px 0;
+            font-weight: bold;
+        }
+
+        h2 {
+            font-size: 32px;
+            font-weight: bold;
+        }
+
+        p {
+            font-size: 16px;
+        }
+
+        /* {{ if show_details }} */
+        .details {
+            list-style: none;
+            padding-left: 0;
+            opacity: .7;
+        }
+
+        .details li span {
+            font-size: 14px;
+            font-weight: bold;
+        }
+
+        .details li code {
+            font-size: 14px;
+            font-weight: normal;
+            padding-left: 7px;
+        }
+        /* {{ end }} */
+
+        @media screen and (max-width: 768px) {
+            main {
+                display: block;
+            }
+
+            .picture, .content {
+                width: 100%;
+                text-align: center;
+            }
+
+            .content {
+                padding: 0 20px;
+            }
+
+            .picture svg {
+                max-width: 60%;
+            }
+        }
+    </style>
+</head>
+<body>
+
+<main>
+    <div class="picture">
+        <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 800 600">
+            <g>
+                <defs>
+                    <clipPath id="GlassClip">
+                        <path
+                            d="M380.857,346.164c-1.247,4.651-4.668,8.421-9.196,10.06c-9.332,3.377-26.2,7.817-42.301,3.5 s-28.485-16.599-34.877-24.192c-3.101-3.684-4.177-8.66-2.93-13.311l7.453-27.798c0.756-2.82,3.181-4.868,6.088-5.13 c6.755-0.61,20.546-0.608,41.785,5.087s33.181,12.591,38.725,16.498c2.387,1.682,3.461,4.668,2.705,7.488L380.857,346.164z"/>
+                    </clipPath>
+                    <clipPath id="cordClip">
+                        <rect width="800" height="600"/>
+                    </clipPath>
+                </defs>
+                <g id="planet">
+                    <circle fill="none" stroke-width="3" stroke-miterlimit="10" cx="572.859" cy="108.803"
+                            r="90.788" class="dark" />
+                    <circle id="craterBig" fill="none" stroke-width="3" stroke-miterlimit="10" cx="548.891"
+                            cy="62.319" r="13.074" class="dark"/>
+                    <circle id="craterSmall" fill="none" stroke-width="3" stroke-miterlimit="10" cx="591.743"
+                            cy="158.918" r="7.989" class="dark"/>
+                    <path id="ring" fill="none" stroke-width="3" stroke-linecap="round" stroke-miterlimit="10"
+                          class="dark"
+                          d="M476.562,101.461c-30.404,2.164-49.691,4.221-49.691,8.007c0,6.853,63.166,12.408,141.085,12.408s141.085-5.555,141.085-12.408c0-3.378-15.347-4.988-40.243-7.225"/>
+                    <path id="ringShadow" opacity="0.5" fill="none" class="dark" stroke-width="3"
+                          stroke-linecap="round" stroke-miterlimit="10"
+                          d="M483.985,127.43c23.462,1.531,52.515,2.436,83.972,2.436c36.069,0,68.978-1.19,93.922-3.149"/>
+                </g>
+                <g id="stars">
+                    <g id="starsBig">
+                        <g>
+                            <line fill="none" class="dark" stroke-width="3" stroke-linecap="round"
+                                  stroke-miterlimit="10" x1="518.07" y1="245.375" x2="518.07" y2="266.581"/>
+                            <line fill="none" class="dark" stroke-width="3" stroke-linecap="round"
+                                  stroke-miterlimit="10" x1="508.129" y1="255.978" x2="528.01" y2="255.978"/>
+                        </g>
+                        <g>
+                            <line fill="none" class="dark" stroke-width="3" stroke-linecap="round"
+                                  stroke-miterlimit="10" x1="154.55" y1="231.391" x2="154.55" y2="252.598"/>
+                            <line fill="none" class="dark" stroke-width="3" stroke-linecap="round"
+                                  stroke-miterlimit="10" x1="144.609" y1="241.995" x2="164.49" y2="241.995"/>
+                        </g>
+                        <g>
+                            <line fill="none" class="dark" stroke-width="3" stroke-linecap="round"
+                                  stroke-miterlimit="10" x1="320.135" y1="132.746" x2="320.135" y2="153.952"/>
+                            <line fill="none" class="dark" stroke-width="3" stroke-linecap="round"
+                                  stroke-miterlimit="10" x1="310.194" y1="143.349" x2="330.075" y2="143.349"/>
+                        </g>
+                        <g>
+                            <line fill="none" class="dark" stroke-width="3" stroke-linecap="round"
+                                  stroke-miterlimit="10" x1="200.67" y1="483.11" x2="200.67" y2="504.316"/>
+                            <line fill="none" class="dark" stroke-width="3" stroke-linecap="round"
+                                  stroke-miterlimit="10" x1="210.611" y1="493.713" x2="190.73" y2="493.713"/>
+                        </g>
+                    </g>
+                    <g id="starsSmall">
+                        <g>
+                            <line fill="none" class="dark" stroke-width="3" stroke-linecap="round"
+                                  stroke-miterlimit="10" x1="432.173" y1="380.52" x2="432.173" y2="391.83"/>
+                            <line fill="none" class="dark" stroke-width="3" stroke-linecap="round"
+                                  stroke-miterlimit="10" x1="426.871" y1="386.175" x2="437.474" y2="386.175"/>
+                        </g>
+                        <g>
+                            <line fill="none" class="dark" stroke-width="3" stroke-linecap="round"
+                                  stroke-miterlimit="10" x1="489.555" y1="299.765" x2="489.555" y2="308.124"/>
+                            <line fill="none" class="dark" stroke-width="3" stroke-linecap="round"
+                                  stroke-miterlimit="10" x1="485.636" y1="303.945" x2="493.473" y2="303.945"/>
+                        </g>
+                        <g>
+                            <line fill="none" class="dark" stroke-width="3" stroke-linecap="round"
+                                  stroke-miterlimit="10" x1="231.468" y1="291.009" x2="231.468" y2="299.369"/>
+                            <line fill="none" class="dark" stroke-width="3" stroke-linecap="round"
+                                  stroke-miterlimit="10" x1="227.55" y1="295.189" x2="235.387" y2="295.189"/>
+                        </g>
+                        <g>
+                            <line fill="none" class="dark" stroke-width="3" stroke-linecap="round"
+                                  stroke-miterlimit="10" x1="244.032" y1="547.539" x2="244.032" y2="555.898"/>
+                            <line fill="none" class="dark" stroke-width="3" stroke-linecap="round"
+                                  stroke-miterlimit="10" x1="247.95" y1="551.719" x2="240.113" y2="551.719"/>
+                        </g>
+                        <g>
+                            <line fill="none" class="dark" stroke-width="3" stroke-linecap="round"
+                                  stroke-miterlimit="10" x1="186.359" y1="406.967" x2="186.359" y2="415.326"/>
+                            <line fill="none" class="dark" stroke-width="3" stroke-linecap="round"
+                                  stroke-miterlimit="10" x1="190.277" y1="411.146" x2="182.44" y2="411.146"/>
+                        </g>
+                        <g>
+                            <line fill="none" class="dark" stroke-width="3" stroke-linecap="round"
+                                  stroke-miterlimit="10" x1="480.296" y1="406.967" x2="480.296" y2="415.326"/>
+                            <line fill="none" class="dark" stroke-width="3" stroke-linecap="round"
+                                  stroke-miterlimit="10" x1="484.215" y1="411.146" x2="476.378" y2="411.146"/>
+                        </g>
+                    </g>
+                    <g id="circlesBig">
+                        <circle fill="none" class="dark" stroke-width="3" stroke-linecap="round"
+                                stroke-miterlimit="10" cx="588.977" cy="255.978" r="7.952"/>
+                        <circle fill="none" class="dark" stroke-width="3" stroke-linecap="round"
+                                stroke-miterlimit="10" cx="450.066" cy="320.259" r="7.952"/>
+                        <circle fill="none" class="dark" stroke-width="3" stroke-linecap="round"
+                                stroke-miterlimit="10" cx="168.303" cy="353.753" r="7.952"/>
+                        <circle fill="none" class="dark" stroke-width="3" stroke-linecap="round"
+                                stroke-miterlimit="10" cx="429.522" cy="201.185" r="7.952"/>
+                        <circle fill="none" class="dark" stroke-width="3" stroke-linecap="round"
+                                stroke-miterlimit="10" cx="200.67" cy="176.313" r="7.952"/>
+                        <circle fill="none" class="dark" stroke-width="3" stroke-linecap="round"
+                                stroke-miterlimit="10" cx="133.343" cy="477.014" r="7.952"/>
+                        <circle fill="none" class="dark" stroke-width="3" stroke-linecap="round"
+                                stroke-miterlimit="10" cx="283.521" cy="568.033" r="7.952"/>
+                        <circle fill="none" class="dark" stroke-width="3" stroke-linecap="round"
+                                stroke-miterlimit="10" cx="413.618" cy="482.387" r="7.952"/>
+                    </g>
+                    <g id="circlesSmall">
+                        <circle class="fill-dark" cx="549.879" cy="296.402" r="2.651"/>
+                        <circle class="fill-dark" cx="253.29" cy="229.24" r="2.651"/>
+                        <circle class="fill-dark" cx="434.824" cy="263.931" r="2.651"/>
+                        <circle class="fill-dark" cx="183.708" cy="544.176" r="2.651"/>
+                        <circle class="fill-dark" cx="382.515" cy="530.923" r="2.651"/>
+                        <circle class="fill-dark" cx="130.693" cy="305.608" r="2.651"/>
+                        <circle class="fill-dark" cx="480.296" cy="477.014" r="2.651"/>
+                    </g>
+                </g>
+                <g id="spaceman" clip-path="url(cordClip)">
+                    <path id="cord" fill="none" class="dark" stroke-width="3" stroke-linecap="round"
+                          stroke-linejoin="round" stroke-miterlimit="10"
+                          d="M273.813,410.969c0,0-54.527,39.501-115.34,38.218c-2.28-0.048-4.926-0.241-7.841-0.548c-68.038-7.178-134.288-43.963-167.33-103.87c-0.908-1.646-1.793-3.3-2.654-4.964c-18.395-35.511-37.259-83.385-32.075-118.817"/>
+                    <path id="backpack" class="dark fill-light" stroke-width="3" stroke-linecap="round"
+                          stroke-linejoin="round" stroke-miterlimit="10"
+                          d="M338.164,454.689l-64.726-17.353c-11.086-2.972-17.664-14.369-14.692-25.455l15.694-58.537c3.889-14.504,18.799-23.11,33.303-19.221l52.349,14.035c14.504,3.889,23.11,18.799,19.221,33.303l-15.694,58.537C360.647,451.083,349.251,457.661,338.164,454.689z"/>
+                    <g id="antenna">
+                        <line class="dark fill-light" stroke-width="3" stroke-linecap="round"
+                              stroke-linejoin="round" stroke-miterlimit="10" x1="323.396" y1="236.625"
+                              x2="295.285" y2="353.753"/>
+                        <circle class="dark fill-light" stroke-width="3" stroke-linecap="round"
+                                stroke-linejoin="round" stroke-miterlimit="10" cx="323.666" cy="235.617"
+                                r="6.375"/>
+                    </g>
+                    <g id="armR">
+                        <path class="dark fill-light" stroke-width="3" stroke-linecap="round"
+                              stroke-linejoin="round" stroke-miterlimit="10"
+                              d="M360.633,363.039c1.352,1.061,4.91,5.056,5.824,6.634l27.874,47.634c3.855,6.649,1.59,15.164-5.059,19.02l0,0c-6.649,3.855-15.164,1.59-19.02-5.059l-5.603-9.663"/>
+                        <path class="dark fill-light" stroke-width="3" stroke-linecap="round"
+                              stroke-linejoin="round" stroke-miterlimit="10"
+                              d="M388.762,434.677c5.234-3.039,7.731-8.966,6.678-14.594c2.344,1.343,4.383,3.289,5.837,5.793c4.411,7.596,1.829,17.33-5.767,21.741c-7.596,4.411-17.33,1.829-21.741-5.767c-1.754-3.021-2.817-5.818-2.484-9.046C375.625,437.355,383.087,437.973,388.762,434.677z"/>
+                    </g>
+                    <g id="armL">
+                        <path class="dark fill-light" stroke-width="3" stroke-linecap="round"
+                              stroke-linejoin="round" stroke-miterlimit="10"
+                              d="M301.301,347.66c-1.702,0.242-5.91,1.627-7.492,2.536l-47.965,27.301c-6.664,3.829-8.963,12.335-5.134,18.999h0c3.829,6.664,12.335,8.963,18.999,5.134l9.685-5.564"/>
+                        <path class="dark fill-light" stroke-width="3" stroke-linecap="round"
+                              stroke-linejoin="round" stroke-miterlimit="10"
+                              d="M241.978,395.324c-3.012-5.25-2.209-11.631,1.518-15.977c-2.701-0.009-5.44,0.656-7.952,2.096c-7.619,4.371-10.253,14.09-5.883,21.71c4.371,7.619,14.09,10.253,21.709,5.883c3.03-1.738,5.35-3.628,6.676-6.59C252.013,404.214,245.243,401.017,241.978,395.324z"/>
+                    </g>
+                    <g id="body">
+                        <path class="dark fill-light" stroke-width="3" stroke-linecap="round"
+                              stroke-linejoin="round" stroke-miterlimit="10"
+                              d="M353.351,365.387c-7.948,1.263-16.249,0.929-24.48-1.278c-8.232-2.207-15.586-6.07-21.836-11.14c-17.004,4.207-31.269,17.289-36.128,35.411l-1.374,5.123c-7.112,26.525,8.617,53.791,35.13,60.899l0,0c26.513,7.108,53.771-8.632,60.883-35.158l1.374-5.123C371.778,395.999,365.971,377.536,353.351,365.387z"/>
+                        <path fill="none" class="dark" stroke-width="3" stroke-linecap="round"
+                              stroke-linejoin="round" stroke-miterlimit="10"
+                              d="M269.678,394.912L269.678,394.912c26.3,20.643,59.654,29.585,93.106,25.724l2.419-0.114"/>
+                    </g>
+                    <g id="legs">
+                        <g id="legR">
+                            <path class="dark fill-light" stroke-width="3" stroke-linecap="round"
+                                  stroke-linejoin="round" stroke-miterlimit="10"
+                                  d="M312.957,456.734l-14.315,53.395c-1.896,7.07,2.299,14.338,9.37,16.234l0,0c7.07,1.896,14.338-2.299,16.234-9.37l17.838-66.534C333.451,455.886,323.526,457.387,312.957,456.734z"/>
+                            <line fill="none" class="dark" stroke-width="3" stroke-linecap="round"
+                                  stroke-linejoin="round" stroke-miterlimit="10" x1="304.883" y1="486.849"
+                                  x2="330.487" y2="493.713"/>
+                        </g>
+                        <g id="legL">
+                            <path class="dark fill-light" stroke-width="3" stroke-linecap="round"
+                                  stroke-linejoin="round" stroke-miterlimit="10"
+                                  d="M296.315,452.273L282,505.667c-1.896,7.07-9.164,11.265-16.234,9.37l0,0c-7.07-1.896-11.265-9.164-9.37-16.234l17.838-66.534C278.993,441.286,286.836,447.55,296.315,452.273z"/>
+                            <line fill="none" class="dark" stroke-width="3" stroke-linecap="round"
+                                  stroke-linejoin="round" stroke-miterlimit="10" x1="262.638" y1="475.522"
+                                  x2="288.241" y2="482.387"/>
+                        </g>
+                    </g>
+                    <g id="head">
+                        <ellipse transform="matrix(0.259 -0.9659 0.9659 0.259 -51.5445 563.2371)"
+                                 class="dark fill-light" stroke-width="3" stroke-linecap="round"
+                                 stroke-linejoin="round" stroke-miterlimit="10" cx="341.295" cy="315.211"
+                                 rx="61.961" ry="60.305"/>
+                        <path id="headStripe" fill="none" class="dark" stroke-width="3"
+                              stroke-linecap="round" stroke-linejoin="round" stroke-miterlimit="10"
+                              d="M330.868,261.338c-7.929,1.72-15.381,5.246-21.799,10.246"/>
+                        <path class="dark fill-light" stroke-width="3" stroke-linecap="round"
+                              stroke-linejoin="round" stroke-miterlimit="10"
+                              d="M380.857,346.164c-1.247,4.651-4.668,8.421-9.196,10.06c-9.332,3.377-26.2,7.817-42.301,3.5s-28.485-16.599-34.877-24.192c-3.101-3.684-4.177-8.66-2.93-13.311l7.453-27.798c0.756-2.82,3.181-4.868,6.088-5.13c6.755-0.61,20.546-0.608,41.785,5.087s33.181,12.591,38.725,16.498c2.387,1.682,3.461,4.668,2.705,7.488L380.857,346.164z"/>
+                        <g clip-path="url(#GlassClip)">
+                            <polygon id="glassShine" fill="none" class="dark" stroke-width="3"
+                                     stroke-miterlimit="10"
+                                     points="278.436,375.599 383.003,264.076 364.393,251.618 264.807,364.928 "/>
+                        </g>
+                    </g>
+                </g>
+            </g>
+        </svg>
+    </div>
+    <div class="content">
+        <h1>{{ code }}</h1>
+        <h2><span data-l10n>UH OH</span>! <span data-l10n>{{ message }}</span></h2>
+        <p data-l10n>{{ description }}</p>
+
+        {{ if show_details }}
+        <ul class="details">
+            {{- if host }}<li><span><span data-l10n>Host</span>:</span> <code>{{ host }}</code></li>{{ end -}}
+            {{- if original_uri }}<li><span><span data-l10n>Original URI</span>:</span> <code>{{ original_uri }}</code></li>{{ end -}}
+            {{- if forwarded_for }}<li><span><span data-l10n>Forwarded for</span>:</span> <code>{{ forwarded_for }}</code></li>{{ end -}}
+            {{- if namespace }}<li><span><span data-l10n>Namespace</span>:</span> <code>{{ namespace }}</code></li>{{ end -}}
+            {{- if ingress_name }}<li><span><span data-l10n>Ingress name</span>:</span> <code>{{ ingress_name }}</code></li>{{ end -}}
+            {{- if service_name }}<li><span><span data-l10n>Service name</span>:</span> <code>{{ service_name }}</code></li>{{ end -}}
+            {{- if service_port }}<li><span><span data-l10n>Service port</span>:</span> <code>{{ service_port }}</code></li>{{ end -}}
+            {{- if request_id }}<li><span><span data-l10n>Request ID</span>:</span> <code>{{ request_id }}</code></li>{{ end -}}
+            <li><span><span data-l10n>Timestamp</span>:</span> <code>{{ now.Unix }}</code></li>
+        </ul>
+        {{ end }}
+    </div>
+</main>
+
+<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.9.1/gsap.min.js"
+        integrity="sha512-H6cPm97FAsgIKmlBA4s774vqoN24V5gSQL4yBTDOY2su2DeXZVhQPxFK4P6GPdnZqM9fg1G3cMv5wD7e6cFLZQ=="
+        crossorigin="anonymous" referrerpolicy="no-referrer"></script>
+
+<script>
+    /** @var {object} gsap is a library for building high-performance animations */
+
+    if (typeof gsap === 'object') {
+        gsap.set("svg", {visibility: "visible"});
+        gsap.to("#headStripe", {y: 0.5, rotation: 1, yoyo: true, repeat: -1, ease: "sine.inOut", duration: 1});
+        gsap.to("#spaceman", {y: 0.5, rotation: 1, yoyo: true, repeat: -1, ease: "sine.inOut", duration: 1});
+        gsap.to("#craterSmall", {x: -3, yoyo: true, repeat: -1, duration: 1, ease: "sine.inOut"});
+        gsap.to("#craterBig", {x: 3, yoyo: true, repeat: -1, duration: 1, ease: "sine.inOut"});
+        gsap.to("#planet", {rotation: -2, yoyo: true, repeat: -1, duration: 1, ease: "sine.inOut", transformOrigin: "50% 50%"});
+        gsap.to("#starsBig g", {rotation: "random(-30,30)", transformOrigin: "50% 50%", yoyo: true, repeat: -1, ease: "sine.inOut"});
+        gsap.fromTo("#starsSmall g", {scale: 0, transformOrigin: "50% 50%"}, {scale: 1, transformOrigin: "50% 50%", yoyo: true, repeat: -1, stagger: 0.1});
+        gsap.to("#circlesSmall circle", {y: -4, yoyo: true, duration: 1, ease: "sine.inOut", repeat: -1});
+        gsap.to("#circlesBig circle", {y: -2, yoyo: true, duration: 1, ease: "sine.inOut", repeat: -1});
+        gsap.set("#glassShine", {x: -68});
+        gsap.to("#glassShine", {x: 80, duration: 2, rotation: -30, ease: "expo.inOut", transformOrigin: "50% 50%", repeat: -1, repeatDelay: 8, delay: 2});
+    } else {
+        console.warn('gsap library is not initialized (network error?)')
+    }
+
+    if (navigator.language.substring(0, 2).toLowerCase() !== 'en') {
+        ((s, p) => { // localize the page (details here - https://github.com/tarampampam/error-pages/tree/master/l10n)
+            s.src = 'https://cdn.jsdelivr.net/gh/tarampampam/error-pages@2/l10n/l10n.min.js'; // '../l10n/l10n.js';
+            s.async = s.defer = true;
+            s.addEventListener('load', () => p.removeChild(s));
+            p.appendChild(s);
+        })(document.createElement('script'), document.body);
+    }
+</script>
+
+</body>
+<!--
+    Error {{ code }}: {{ message }}
+    Description: {{ description }}
+-->
+</html>

templates/matrix.html

@@ -0,0 +1,279 @@
+<!DOCTYPE html>
+<!--
+    Error {{ code }}: {{ message }}
+    Description: {{ description }}
+-->
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <meta name="robots" content="noindex, nofollow"/>
+    <meta http-equiv="X-UA-Compatible" content="IE=edge">
+    <title>{{ message }} ({{ code }})</title>
+    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
+    <link href="https://fonts.googleapis.com/css2?family=Inconsolata:wght@400;700&display=swap" rel="stylesheet">
+    <style>
+        :root{--matrix-glyph-size:15px;--matrix-glyph-font-size:15px;--matrix-glyph-front-color:rgba(255, 255, 255, 0.8);--matrix-glyph-tail-color:#0f0;--matrix-overlay-color:rgba(0, 0, 0, 0.12)}
+        body,html{margin:0;padding:0;background-color:#000;height:100vh}
+        #matrix{display:block;position:fixed;width:100vw;height:100vh}
+        .container{align-items:center;display:flex;justify-content:center;position:absolute;top:0;left:0;width:100vw;height:100vh;z-index:1}
+        .container .message{background-color:rgba(0,0,0,.85);border:2px solid var(--matrix-glyph-tail-color);padding:15px 20px;margin:0 20px;font-family:Inconsolata,Helvetica,sans-serif;text-align:center;font-size:0;color:var(--matrix-glyph-tail-color);text-shadow:1px 0 2px var(--matrix-glyph-tail-color),-1px 0 2px var(--matrix-glyph-tail-color);box-shadow:1px 0 5px var(--matrix-glyph-tail-color),-1px 0 2px var(--matrix-glyph-tail-color);max-width:640px}
+        .container .message h1{margin:0;font-size:52px}
+        .container .message p{margin:.3em 0 0 0;font-size:17px;color:var(--matrix-glyph-front-color)}
+        /* {{ if show_details }} */
+        .container .details{margin-top:20px}
+        .container .details ul{padding:0}
+        .container .details code,.container .details span{font-size:11px}
+        .container .details code{padding-left:7px}
+        /* {{ end }} */
+        .hidden {display:none}
+        @media screen and (max-width:820px){
+            :root{--matrix-glyph-size:10px;--matrix-glyph-font-size:10px}
+            .container .message h1{font-size:38px}
+            .container .message p{font-size:13px}
+            /* {{ if show_details }} */
+            .container .details code,.container .details span{font-size:11px}
+            /* {{ end }} */
+        }
+    </style>
+</head>
+<body>
+
+<div class="container">
+    <ul id="matrix-words" class="hidden">
+        <li>{{ code }}</li>
+        <li>{{ message }}</li>
+        <li>{{ description }}</li>
+        <li>{{ code }} {{ message }}</li>
+    </ul>
+
+    <div class="message">
+        <h1>{{ code }}: <span data-l10n>{{ message }}</span></h1>
+        <p data-l10n>{{ description }}</p>
+
+        {{ if show_details }}
+        <div class="details">
+            <ul>
+                {{- if host }}<li><span><span data-l10n>Host</span>:</span> <code>{{ host }}</code></li>{{ end -}}
+                {{- if original_uri }}<li><span><span data-l10n>Original URI</span>:</span> <code>{{ original_uri }}</code></li>{{ end -}}
+                {{- if forwarded_for }}<li><span><span data-l10n>Forwarded for</span>:</span> <code>{{ forwarded_for }}</code></li>{{ end -}}
+                {{- if namespace }}<li><span><span data-l10n>Namespace</span>:</span> <code>{{ namespace }}</code></li>{{ end -}}
+                {{- if ingress_name }}<li><span><span data-l10n>Ingress name</span>:</span> <code>{{ ingress_name }}</code></li>{{ end -}}
+                {{- if service_name }}<li><span><span data-l10n>Service name</span>:</span> <code>{{ service_name }}</code></li>{{ end -}}
+                {{- if service_port }}<li><span><span data-l10n>Service port</span>:</span> <code>{{ service_port }}</code></li>{{ end -}}
+                {{- if request_id }}<li><span><span data-l10n>Request ID</span>:</span> <code>{{ request_id }}</code></li>{{ end -}}
+                <li><span><span data-l10n>Timestamp</span>:</span> <code>{{ now.Unix }}</code></li>
+            </ul>
+        </div>
+        {{ end }}
+    </div>
+</div>
+
+<canvas id="matrix"></canvas>
+
+<script>
+    'use strict';
+
+    /**
+     * @param {HTMLCanvasElement} $canvas
+     * @constructor
+     */
+    const Matrix = function ($canvas) {
+        const symbols = 'ラドクリフマラソンわたしワタシんょンョたばこタバコとうきょうトウキョウ '.split('');
+
+        /**
+         * @return {string}
+         */
+        const getRandomSymbol = function () {
+            return symbols[Math.floor(Math.random() * symbols.length)];
+        }
+
+        const ctx = $canvas.getContext('2d');
+        ctx.globalCompositeOperation = 'lighter'; // https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/globalCompositeOperation
+
+        this.redrawInterval = 90; // fade oud speed
+        this.glyphSize = 0;
+        this.rowsCapacity = 0;
+        this.columnsCapacity = 0;
+
+        /**
+         * @return {void}
+         */
+        this.init = () => {
+            $canvas.width = $canvas.clientWidth;
+            $canvas.height = $canvas.clientHeight;
+
+            this.glyphSize = parseInt(getComputedStyle($canvas).getPropertyValue('--matrix-glyph-size'), 10);
+            this.rowsCapacity = Math.ceil($canvas.clientHeight / this.glyphSize);
+            this.columnsCapacity = Math.ceil($canvas.clientWidth / this.glyphSize);
+        };
+
+        /**
+         * @param {string} symbol
+         * @param {number} row
+         * @param {number} column
+         * @param {string} color
+         */
+        const drawSymbol = (symbol, row, column, color) => {
+            if (row > this.rowsCapacity || column > this.columnsCapacity) {
+                return;
+            }
+
+            ctx.fillStyle = color;
+            ctx.font = getComputedStyle($canvas).getPropertyValue('--matrix-glyph-font-size') + ' monospace';
+
+            if (symbol.length > 1) {
+                symbol = symbol.charAt(0); // only one char is allowed
+            }
+
+            let xOffset = 0, charCode = symbol.charCodeAt(0);
+
+            if (charCode >= 33 && charCode <= 126) { // is ascii
+                xOffset = this.glyphSize / 5;
+            }
+
+            ctx.fillText(symbol, (column * this.glyphSize) + xOffset, row * this.glyphSize);
+        };
+
+        /**
+         * @param {number} column
+         * @param {number} speed Lowest = fastest, largest = slowest
+         * @param {string?} text
+         * @param {number?} offset
+         */
+        const drawLine = (column, speed, text, offset) => {
+            let cursor = 0;
+
+            const tailColor = getComputedStyle($canvas).getPropertyValue('--matrix-glyph-tail-color'),
+                frontColor = getComputedStyle($canvas).getPropertyValue('--matrix-glyph-front-color');
+
+            const handler = window.setInterval(() => {
+                if (column > this.columnsCapacity) {
+                    return window.clearInterval(handler);
+                }
+
+                if (cursor <= this.rowsCapacity) {
+                    let symbol = getRandomSymbol();
+
+                    if (typeof text === 'string' && typeof offset === 'number') {
+                        if (cursor >= offset && text.length >= cursor - offset) {
+                            symbol = text.charAt(cursor - offset);
+                        }
+                    }
+
+                    if (typeof symbol === 'string' && symbol !== ' ') {
+                        const prev = cursor;
+
+                        window.setTimeout(() => { // redraw with a green color
+                            drawSymbol(symbol, prev, column, tailColor);
+                        }, speed / 1.3);
+
+                        drawSymbol(symbol, cursor, column, frontColor); // white color first
+                    }
+
+                    cursor++;
+                } else {
+                    window.clearInterval(handler);
+                }
+            }, speed);
+        };
+
+        /**
+         * @return {void}
+         */
+        this.redraw = () => {
+            ctx.fillStyle = getComputedStyle($canvas).getPropertyValue('--matrix-overlay-color');
+            ctx.fillRect(0, 0, $canvas.clientWidth, $canvas.clientHeight);
+        };
+
+        let redrawIntervalHandler = undefined, dropsIntervalHandler = undefined;
+
+        /**
+         * @param {HTMLUListElement?} $linesList
+         */
+        this.run = ($linesList) => {
+            if (redrawIntervalHandler === undefined) {
+                redrawIntervalHandler = window.setInterval(this.redraw, this.redrawInterval);
+            }
+
+            if (dropsIntervalHandler === undefined) {
+                const fn = () => {
+                    const randomColumn = Math.floor(Math.random() * (this.columnsCapacity + 1)),
+                        minSpeed = 200, maxSpeed = 50,
+                        randomSpeed = Math.floor(Math.random() * (maxSpeed - minSpeed + 1)) + minSpeed;
+
+                    const list = [];
+                    let line = undefined, offset = undefined;
+
+                    if ($linesList !== undefined) {
+                        Array.prototype.forEach.call($linesList.querySelectorAll('li'), $li => {
+                            const text = $li.innerText.trim();
+
+                            if (text.length > 0) {
+                                list.push(text);
+                            }
+                        });
+
+                        if (list.length > 0 && Math.random() > 0.4) {
+                            line = list[Math.floor(Math.random() * list.length)];
+                            offset = Math.floor(Math.random() * line.length);
+
+                            if (offset <= 5) {
+                                offset *= 3;
+                            }
+                        }
+                    }
+
+                    drawLine(randomColumn, randomSpeed, line, offset);
+
+                    if (dropsIntervalHandler !== undefined) {
+                        window.clearInterval(dropsIntervalHandler);
+                        dropsIntervalHandler = undefined;
+                    }
+
+                    dropsIntervalHandler = window.setInterval(fn, ((minSpeed + maxSpeed) / 2 * this.rowsCapacity) / this.columnsCapacity / 0.5);
+                };
+
+                fn();
+            }
+        };
+
+        /**
+         * @return {void}
+         */
+        this.stop = () => {
+            if (redrawIntervalHandler !== undefined) {
+                window.clearInterval(redrawIntervalHandler);
+                redrawIntervalHandler = undefined;
+            }
+
+            if (dropsIntervalHandler !== undefined) {
+                window.clearInterval(dropsIntervalHandler);
+                dropsIntervalHandler = undefined;
+            }
+        };
+
+        if (typeof ResizeObserver === 'function') {
+            (new ResizeObserver(this.init)).observe($canvas);
+        } else {
+            this.init();
+        }
+    };
+
+    (new Matrix(document.getElementById('matrix'))).run(document.getElementById('matrix-words'));
+
+    if (navigator.language.substring(0, 2).toLowerCase() !== 'en') {
+        ((s, p) => { // localize the page (details here - https://github.com/tarampampam/error-pages/tree/master/l10n)
+            s.src = 'https://cdn.jsdelivr.net/gh/tarampampam/error-pages@2/l10n/l10n.min.js'; // '../l10n/l10n.js';
+            s.async = s.defer = true;
+            s.addEventListener('load', () => p.removeChild(s));
+            p.appendChild(s);
+        })(document.createElement('script'), document.body);
+    }
+</script>
+</body>
+<!--
+    Error {{ code }}: {{ message }}
+    Description: {{ description }}
+-->
+</html>

templates/noise.html

@@ -2,6 +2,17 @@
 <!--
     Error {{ code }}: {{ message }}
     Description: {{ description }}
+{{ if show_details }}
+    {{ if host }}Host: {{ host }}{{ end }}
+    {{ if original_uri }}Original URI: {{ original_uri }}{{ end }}
+    {{ if forwarded_for }}Forwarded for: {{ forwarded_for }}{{ end }}
+    {{ if namespace }}Namespace: {{ namespace }}{{ end }}
+    {{ if ingress_name }}Ingress name: {{ ingress_name }}{{ end }}
+    {{ if service_name }}Service name: {{ service_name }}{{ end }}
+    {{ if service_port }}Service port: {{ service_port }}{{ end }}
+    {{ if request_id }}Request ID: {{ request_id }}{{ end }}
+    Timestamp: {{ now.Unix }}
+{{ end }}
 -->
 <html lang="en">
 <head>
@@ -119,7 +130,7 @@
 <div class="container-center">
     <div>
         <h1>{{ code }}</h1>
-        <h2>{{ description }}</h2>
+        <h2 data-l10n>{{ description }}</h2>
     </div>
 </div>
 
@@ -163,6 +174,15 @@
     window.addEventListener('beforeunload', function (/** @param BeforeUnloadEvent event */ event) {
         window.clearInterval(flickerInterval);
     });
+
+    if (navigator.language.substring(0, 2).toLowerCase() !== 'en') {
+        ((s, p) => { // localize the page (details here - https://github.com/tarampampam/error-pages/tree/master/l10n)
+            s.src = 'https://cdn.jsdelivr.net/gh/tarampampam/error-pages@2/l10n/l10n.min.js'; // '../l10n/l10n.js';
+            s.async = s.defer = true;
+            s.addEventListener('load', () => p.removeChild(s));
+            p.appendChild(s);
+        })(document.createElement('script'), document.body);
+    }
 </script>
 </body>
 <!--

templates/readme.md

@@ -0,0 +1,37 @@
+# Templates
+
+Creating templates is a very simple operation, even for those who know nothing at all about [Go Template](https://pkg.go.dev/text/template). All you should know is:
+
+- The template should be one page. Without additional `css` or `js` files (but you can load them from the CDN or another GitHub repositories using [jsdelivr.com](https://www.jsdelivr.com/), for example)
+- Don't forget to include `<meta name="robots" content="noindex, nofollow" />` tag in the header
+- You can use a special "placeholders" (wrapped in `{{` and `}}`) for the rendering error code, message and others (see details below)
+
+## Supported signatures
+
+### Error page & request data
+
+| Signature                           | Description                                                   | Example                                      |
+|-------------------------------------|---------------------------------------------------------------|----------------------------------------------|
+| `{{ code }}`                        | Error page code                                               | `404`                                        |
+| `{{ message }}`                     | Error code message                                            | `Not found`                                  |
+| `{{ description }}`                 | Error code description                                        | `The server can not find the requested page` |
+| `{{ original_uri }}`                | `X-Original-URI` header value                                 | `/foo1/bar2`                                 |
+| `{{ namespace }}`                   | `X-Namespace` header value                                    | `foo`                                        |
+| `{{ ingress_name }}`                | `X-Ingress-Name` header value                                 | `bar`                                        |
+| `{{ service_name }}`                | `X-Service-Name` header value                                 | `baz`                                        |
+| `{{ service_port }}`                | `X-Service-Port` header value                                 | `8080`                                       |
+| `{{ request_id }}`                  | `X-Request-ID` header value                                   | `12AB34CD56EF78`                             |
+| `{{ forwarded_for }}`               | `X-Forwarded-For` header value                                | `203.0.113.195, 70.41.3.18`                  |
+| `{{ host }}`                        | `Host` header value                                           | `example.com`                                |
+| `{{ now.Unix }}`                    | Current timestamp (e.g. in Unix format)                       | `1643621927`                                 |
+| `{{ hostname }}`                    | OS hostname                                                   | `ab12cd34ef56`                               |
+| `{{ version }}`                     | Application version                                           | `2.5.0`                                      |
+| `{{ if show_details }}...{{ end }}` | Logical operator (server started with "show details" option?) |                                              |
+| `{{ if hide_details }}...{{ end }}` | Same as above, but inverted                                   |                                              |
+
+### Modifiers
+
+| Signature                          | Description                    | Example                             |
+|------------------------------------|--------------------------------|-------------------------------------|
+| <code>{{ ... &#124; json }}</code> | Convert value into json-string | <code>{{ code &#124; json }}</code> |
+| <code>{{ ... &#124; int }}</code>  | Convert value into integer     | <code>{{ code &#124; int }}</code>  |

templates/shuffle.html

@@ -15,61 +15,214 @@
             margin: 0;
             background-color: #222;
             color: #aaa;
-            font-family: 'Hack', monospace
+            font-family: 'Hack', monospace;
+            font-size: 0;
         }
 
         .full-height {
-            height: 100vh
+            height: 100vh;
         }
 
         .flex-center {
             align-items: center;
             display: flex;
-            justify-content: center
+            justify-content: center;
         }
 
         #error_text {
-            font-size: 2em
+            font-size: 32px;
         }
+
+        /* {{ if show_details }} */
+        #details table {
+            width: 100%;
+            border-collapse: collapse;
+            box-sizing: border-box;
+            margin-top: 20px;
+        }
+
+        #details.hidden td {
+            opacity: 0;
+            font-size: 0;
+            color: #222;
+        }
+
+        #details td {
+            font-size: 11px;
+            color: #999;
+            padding-top: .5em;
+            transition: opacity 1.4s, font-size .3s, color 1.2s;
+            opacity: 1;
+        }
+
+        #details td.name {
+            text-align: right;
+            padding-right: .3em;
+            width: 50%;
+        }
+
+        #details td.value {
+            text-align: left;
+            padding-left: .3em;
+            font-family: 'Lucida Console', 'Courier New', monospace;
+        }
+        /* {{ end }} */
     </style>
 </head>
 <body>
 <div class="flex-center full-height">
-    <span id="error_text">{{ code }}: {{ message }}</span>
+    <div>
+        <div id="error_text">
+            <span class="source">{{ code }}: <span data-l10n>{{ message }}</span></span>
+            <span class="target"></span>
+        </div>
+        {{ if show_details }}
+        <div class="hidden" id="details">
+            <table>
+                {{- if host }}
+                <tr>
+                    <td class="name"><span data-l10n>Host</span>:</td>
+                    <td class="value">{{ host }}</td>
+                </tr>
+                {{ end -}}
+                {{- if original_uri }}
+                <tr>
+                    <td class="name"><span data-l10n>Original URI</span>:</td>
+                    <td class="value">{{ original_uri }}</td>
+                </tr>
+                {{ end -}}
+                {{- if forwarded_for }}
+                <tr>
+                    <td class="name"><span data-l10n>Forwarded for</span>:</td>
+                    <td class="value">{{ forwarded_for }}</td>
+                </tr>
+                {{ end -}}
+                {{- if namespace }}
+                <tr>
+                    <td class="name"><span data-l10n>Namespace</span>:</td>
+                    <td class="value">{{ namespace }}</td>
+                </tr>
+                {{ end -}}
+                {{- if ingress_name }}
+                <tr>
+                    <td class="name"><span data-l10n>Ingress name</span>:</td>
+                    <td class="value">{{ ingress_name }}</td>
+                </tr>
+                {{ end -}}
+                {{- if service_name }}
+                <tr>
+                    <td class="name"><span data-l10n>Service name</span>:</td>
+                    <td class="value">{{ service_name }}</td>
+                </tr>
+                {{ end -}}
+                {{- if service_port }}
+                <tr>
+                    <td class="name"><span data-l10n>Service port</span>:</td>
+                    <td class="value">{{ service_port }}</td>
+                </tr>
+                {{ end -}}
+                {{- if request_id }}
+                <tr>
+                    <td class="name"><span data-l10n>Request ID</span>:</td>
+                    <td class="value">{{ request_id }}</td>
+                </tr>
+                {{ end -}}
+                <tr>
+                    <td class="name"><span data-l10n>Timestamp</span>:</td>
+                    <td class="value">{{ now.Unix }}</td>
+                </tr>
+            </table>
+        </div>
+        {{ end }}
+    </div>
 </div>
 
 <script>
     'use strict';
 
-    const $errorText = document.getElementById('error_text'),
-        text = $errorText.innerText,
-        characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890-=+<>,./?[{()}]!@#$%^&*~`\|'.split('');
-    let progress = 0;
+    /**
+     * @param {HTMLElement} $el
+     */
+    const Shuffle = function ($el) {
+        const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890-=+<>,./?[{()}]!@#$%^&*~`\|'.split(''),
+            $source = $el.querySelector('.source'), $target = $el.querySelector('.target');
 
-    const scrambleInterval = window.setInterval(function () {
-        let newText = text;
+        let cursor = 0, scrambleInterval = undefined, cursorDelayInterval = undefined, cursorInterval = undefined;
 
-        for (let i = 0; i < text.length; i++) {
-            if (i >= progress) {
-                newText = newText.substr(0, i) +
-                    characters[Math.round(Math.random() * (characters.length - 1))] +
-                    newText.substr(i + 1);
-            }
+        /**
+         * @param {Number} len
+         * @return {string}
+         */
+        const getRandomizedString = function (len) {
+            let s = '';
+
+            for (let i = 0; i < len; i++) {
+                s += chars[Math.floor(Math.random() * chars.length)];
             }
 
-        $errorText.innerText = newText;
-    }, 800 / 60);
+            return s;
+        };
 
-    window.setTimeout(function () {
-        let revealInterval = window.setInterval(function () {
-            if (progress < text.length) {
-                progress++;
-            } else {
-                window.clearInterval(revealInterval);
-                window.clearInterval(scrambleInterval);
+        this.start = function () {
+            $source.style.display = 'none';
+            $target.style.display = 'block';
+
+            scrambleInterval = window.setInterval(() => {
+                if (cursor <= $source.innerText.length) {
+                    $target.innerText = $source.innerText.substring(0, cursor) + getRandomizedString($source.innerText.length - cursor);
                 }
+            }, 450 / 30);
+
+            cursorDelayInterval = window.setTimeout(() => {
+                cursorInterval = window.setInterval(() => {
+                    if (cursor > $source.innerText.length - 1) {
+                        this.stop();
+                    }
+
+                    cursor++;
                 }, 70);
             }, 350);
+        };
+
+        this.stop = function () {
+            $source.style.display = 'block';
+            $target.style.display = 'none';
+            $target.innerText = '';
+            cursor = 0;
+
+            if (scrambleInterval !== undefined) {
+                window.clearInterval(scrambleInterval);
+                scrambleInterval = undefined;
+            }
+
+            if (cursorInterval !== undefined) {
+                window.clearInterval(cursorInterval);
+                cursorInterval = undefined;
+            }
+
+            if (cursorDelayInterval !== undefined) {
+                window.clearInterval(cursorDelayInterval);
+                cursorDelayInterval = undefined;
+            }
+        };
+    };
+
+    (new Shuffle(document.getElementById('error_text'))).start();
+
+    // {{ if show_details }}
+    window.setTimeout(function () {
+        document.getElementById('details').classList.remove('hidden');
+    }, 550);
+    // {{ end }}
+
+    if (navigator.language.substring(0, 2).toLowerCase() !== 'en') {
+        ((s, p) => { // localize the page (details here - https://github.com/tarampampam/error-pages/tree/master/l10n)
+            s.src = 'https://cdn.jsdelivr.net/gh/tarampampam/error-pages@2/l10n/l10n.min.js'; // '../l10n/l10n.js';
+            s.async = s.defer = true;
+            s.addEventListener('load', () => p.removeChild(s));
+            p.appendChild(s);
+        })(document.createElement('script'), document.body);
+    }
 </script>
 </body>
 <!--

test/hurl/404.hurl

@@ -0,0 +1,7 @@
+GET http://{{ host }}:{{ port }}/not-found
+
+HTTP/* 404
+
+[Asserts]
+header "Content-Type" contains "text/plain"
+body contains "Wrong request URL"

test/hurl/code_502_default.hurl

@@ -0,0 +1,10 @@
+GET http://{{ host }}:{{ port }}/502.html
+
+HTTP/* 200
+
+[Asserts]
+header "Content-Type" contains "text/html"
+header "X-Robots-Tag" == "noindex"
+body contains "502"
+body contains "Bad Gateway"
+body contains "The server received an invalid response from the upstream server"

test/hurl/code_502_json.hurl

@@ -0,0 +1,43 @@
+# The common request
+GET http://{{ host }}:{{ port }}/502.html
+Content-Type: application/json;charset=UTF-8
+X-Original-URI: foo
+X-Namespace: bar
+X-Ingress-Name: baz
+X-Service-Name: aaa
+X-Service-Port: bbb
+X-Request-ID: ccc
+X-Forwarded-For: ddd
+Host: eee
+
+HTTP/* 200
+
+[Asserts]
+header "Content-Type" contains "application/json"
+header "X-Robots-Tag" == "noindex"
+jsonpath "$.error" == true
+jsonpath "$.code" == "502"
+jsonpath "$.message" == "Bad Gateway"
+jsonpath "$.description" == "The server received an invalid response from the upstream server"
+jsonpath "$.details.original_uri" == "foo"
+jsonpath "$.details.namespace" == "bar"
+jsonpath "$.details.ingress_name" == "baz"
+jsonpath "$.details.service_name" == "aaa"
+jsonpath "$.details.service_port" == "bbb"
+jsonpath "$.details.request_id" == "ccc"
+jsonpath "$.details.forwarded_for" == "ddd"
+jsonpath "$.details.host" == "eee"
+jsonpath "$.details.timestamp" isInteger
+
+# X-Format in the action
+GET http://{{ host }}:{{ port }}/502.html
+X-Format: text/json
+
+HTTP/* 200
+
+[Asserts]
+header "Content-Type" contains "application/json"
+header "X-Robots-Tag" == "noindex"
+jsonpath "$.error" == true
+jsonpath "$.code" == "502"
+jsonpath "$.message" == "Bad Gateway"

test/hurl/code_502_xml.hurl

@@ -0,0 +1,42 @@
+# The common request
+GET http://{{ host }}:{{ port }}/502.html
+Content-Type: application/xml;charset=UTF-8
+X-Original-URI: foo
+X-Namespace: bar
+X-Ingress-Name: baz
+X-Service-Name: aaa
+X-Service-Port: bbb
+X-Request-ID: ccc
+X-Forwarded-For: ddd
+Host: eee
+
+HTTP/* 200
+
+[Asserts]
+header "Content-Type" contains "application/xml"
+header "X-Robots-Tag" == "noindex"
+xpath "string(//error/code)" == "502"
+xpath "string(//error/message)" == "Bad Gateway"
+xpath "string(//error/description)" == "The server received an invalid response from the upstream server"
+xpath "string(//error/details/originalURI)" == "foo"
+xpath "string(//error/details/namespace)" == "bar"
+xpath "string(//error/details/ingressName)" == "baz"
+xpath "string(//error/details/serviceName)" == "aaa"
+xpath "string(//error/details/servicePort)" == "bbb"
+xpath "string(//error/details/requestID)" == "ccc"
+xpath "string(//error/details/forwardedFor)" == "ddd"
+xpath "string(//error/details/host)" == "eee"
+xpath "string(//error/details/timestamp)" exists
+
+# X-Format in the action
+GET http://{{ host }}:{{ port }}/502.html
+X-Format: text/xml
+
+HTTP/* 200
+
+[Asserts]
+header "Content-Type" contains "application/xml"
+header "X-Robots-Tag" == "noindex"
+xpath "string(//error/code)" == "502"
+xpath "string(//error/message)" == "Bad Gateway"
+xpath "string(//error/description)" == "The server received an invalid response from the upstream server"

test/hurl/healthz.hurl

@@ -0,0 +1,12 @@
+GET http://{{ host }}:{{ port }}/healthz
+
+HTTP/* 200
+
+```OK```
+
+# Next endpoint marked as deprecated
+GET http://{{ host }}:{{ port }}/health/live
+
+HTTP/* 200
+
+```OK```

test/hurl/index.hurl

@@ -0,0 +1,34 @@
+# HTML content
+GET http://{{ host }}:{{ port }}/
+
+HTTP/* 404
+
+[Asserts]
+header "Content-Type" contains "text/html"
+body contains "404"
+body contains "Not Found"
+
+# JSON content
+GET http://{{ host }}:{{ port }}/
+Content-Type: text/json
+
+HTTP/* 404
+
+[Asserts]
+header "Content-Type" contains "application/json"
+header "X-Robots-Tag" == "noindex"
+jsonpath "$.error" == true
+jsonpath "$.code" == "404"
+jsonpath "$.message" == "Not Found"
+
+# XML content
+GET http://{{ host }}:{{ port }}/
+Content-Type: application/xml
+
+HTTP/* 404
+
+[Asserts]
+header "Content-Type" contains "application/xml"
+header "X-Robots-Tag" == "noindex"
+xpath "string(//error/code)" == "404"
+xpath "string(//error/message)" == "Not Found"

test/hurl/metrics.hurl

@@ -0,0 +1,8 @@
+GET http://{{ host }}:{{ port }}/metrics
+
+HTTP/* 200
+
+[Asserts]
+header "Content-Type" contains "text/plain"
+body contains "http_requests_duration_millisecond"
+body contains "http_requests_total_count"

test/hurl/proxy_headers.hurl

@@ -0,0 +1,13 @@
+GET http://{{ host }}:{{ port }}/502.html
+X-Foo: foo
+bar: BAR
+Baz_blah: baz Baz
+NonEx: skip
+
+HTTP/* 200
+
+[Asserts]
+header "X-Foo" == "foo"
+header "Bar" == "BAR"
+header "Baz_blah" == "baz Baz"
+header "NonEx" not exists

test/hurl/readme.md

@@ -0,0 +1,27 @@
+# Hurl
+
+Hurl is a command line tool that runs **HTTP requests** defined in a simple **plain text format**.
+
+## How to use
+
+It can perform requests, capture values and evaluate queries on headers and body response. Hurl is very versatile: it can be used for both fetching data and testing HTTP sessions.
+
+```hurl
+# Get home:
+GET https://example.net
+
+HTTP/1.1 200
+[Captures]
+csrf_token: xpath "string(//meta[@name='_csrf_token']/@content)"
+
+# Do login!
+POST https://example.net/login?user=toto&password=1234
+X-CSRF-TOKEN: {{csrf_token}}
+
+HTTP/1.1 302
+```
+
+### Links:
+
+- [Official website](https://hurl.dev/)
+- [GitHub](https://github.com/Orange-OpenSource/hurl)

test/hurl/version.hurl

@@ -0,0 +1,8 @@
+GET http://{{ host }}:{{ port }}/version
+
+HTTP/* 200
+
+[Asserts]
+header "Content-Type" == "application/json"
+jsonpath "$.version" exists
+jsonpath "$.version" isString

test/hurl/x_code.hurl

@@ -0,0 +1,37 @@
+# Common request to the index page
+GET http://{{ host }}:{{ port }}/
+X-Code: 410
+
+HTTP/* 410
+
+[Asserts]
+header "Content-Type" contains "text/html"
+header "X-Robots-Tag" == "noindex"
+body contains "410"
+body contains "Gone"
+
+# X-Code with X-Format
+GET http://{{ host }}:{{ port }}/
+X-Code: 410
+X-Format: text/html;q=0.9,application/xhtml+xml;q=0.9,application/json,image/avif,image/webp,*/*;q=0.8
+
+HTTP/* 410
+
+[Asserts]
+header "Content-Type" contains "application/json"
+header "X-Robots-Tag" == "noindex"
+jsonpath "$.error" == true
+jsonpath "$.code" == "410"
+jsonpath "$.message" == "Gone"
+
+# Error pages should ignore X-Code
+GET http://{{ host }}:{{ port }}/502.html
+X-Code: 410
+
+HTTP/* 200
+
+[Asserts]
+header "Content-Type" contains "text/html"
+header "X-Robots-Tag" == "noindex"
+body contains "502"
+body contains "Bad Gateway"

test/wrk/request.lua

@@ -0,0 +1,9 @@
+local formats = { 'application/json', 'application/xml', 'text/html', 'text/plain' }
+
+request = function()
+    wrk.headers["X-Namespace"] = "NAMESPACE_" .. tostring(math.random(0, 99999999))
+    wrk.headers["X-Request-ID"] = "REQ_ID_" .. tostring(math.random(0, 99999999))
+    wrk.headers["Content-Type"] = formats[ math.random( 0, #formats - 1 ) ]
+
+    return wrk.format("GET", "/500.html?rnd=" .. tostring(math.random(0, 99999999)), nil, nil)
+end