chore: 🔧 Changes that do not modify src or test files

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

.dockerignore

@@ -1,14 +1,9 @@
-.dockerignore
-Dockerfile
-.github
-.git
-.gitignore
-.editorconfig
-.idea
-.vscode
-test
-temp
-tmp
-LICENSE
-Makefile
-error-pages
+## Ignore everything
+*
+
+## Except the following files and directories
+!/cmd
+!/internal
+!/templates
+!/error-pages.yml
+!/go.*

.editorconfig

@@ -7,11 +7,8 @@ charset = utf-8
 end_of_line = lf
 insert_final_newline = true
 indent_style = space
-indent_size = 4
-trim_trailing_whitespace = true
-
-[*.{yml, yaml, sh, conf}]
 indent_size = 2
+trim_trailing_whitespace = true
 
 [{Makefile, go.mod, *.go}]
 indent_style = tab

.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/ISSUE_TEMPLATE/bug-report.yml

@@ -12,6 +12,8 @@ body:
       options:
         - label: I have searched the existing issues
           required: true
+        - label: And it has nothing to do with Traefik
+          required: true
 
   - type: textarea
     attributes:

.github/ISSUE_TEMPLATE/config.yml

@@ -6,3 +6,7 @@ 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/renovate.json

@@ -0,0 +1,7 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "github>tarampampam/.github//renovate/default",
+    ":rebaseStalePrs"
+  ]
+}

.github/workflows/documentation.yml

@@ -8,11 +8,11 @@ on:
 jobs:
   docker-hub-description:
     name: Docker Hub Description
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
-      - uses: peter-evans/dockerhub-description@v2 # Action page: <https://github.com/peter-evans/dockerhub-description>
+      - uses: peter-evans/dockerhub-description@v3 # Action page: <https://github.com/peter-evans/dockerhub-description>
         with:
           username: ${{ secrets.DOCKER_LOGIN }}
           password: ${{ secrets.DOCKER_USER_PASSWORD }}

.github/workflows/release.yml

@@ -5,22 +5,33 @@ on:
     types: [published]
 
 jobs:
+  purge-cdn-cache:
+    name: Purge jsDelivr CDN cache
+    runs-on: ubuntu-latest
+    steps:
+      - uses: gacts/purge-jsdelivr-cache@v1 # Action page: <https://github.com/gacts/purge-jsdelivr-cache>
+        with:
+          url: |
+            https://cdn.jsdelivr.net/gh/tarampampam/error-pages@2/l10n/l10n.js
+            https://cdn.jsdelivr.net/gh/tarampampam/error-pages@2/l10n/l10n.min.js
+            https://cdn.jsdelivr.net/gh/tarampampam/error-pages@latest/l10n/l10n.js
+            https://cdn.jsdelivr.net/gh/tarampampam/error-pages@latest/l10n/l10n.min.js
+
   build:
     name: Build for ${{ matrix.os }} (${{ matrix.arch }})
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
         os: [linux, darwin] # linux, freebsd, darwin, windows
         arch: [amd64]  # amd64, 386
     steps:
-      - uses: actions/setup-go@v2
-        with: {go-version: 1.17.5}
+      - uses: actions/checkout@v3
 
-      - uses: actions/checkout@v2
+      - uses: gacts/setup-go-with-cache@v1
+        with: {go-version-file: go.mod}
 
-      - uses: gacts/github-slug@v1
-        id: slug
+      - {uses: gacts/github-slug@v1, id: slug}
 
       - name: Generate builder values
         id: values
@@ -31,7 +42,7 @@ jobs:
           GOOS: ${{ matrix.os }}
           GOARCH: ${{ matrix.arch }}
           CGO_ENABLED: 0
-          LDFLAGS: -s -w -X github.com/tarampampam/error-pages/internal/version.version=${{ steps.slug.outputs.version }}
+          LDFLAGS: -s -w -X gh.tarampamp.am/error-pages/internal/version.version=${{ steps.slug.outputs.version }}
         run: go build -trimpath -ldflags "$LDFLAGS" -o "./${{ steps.values.outputs.binary-name }}" ./cmd/error-pages/
 
       - name: Upload binary file to release
@@ -44,29 +55,28 @@ jobs:
 
   docker-image:
     name: Build docker image
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
-      - uses: gacts/github-slug@v1
-        id: slug
+      - {uses: gacts/github-slug@v1, id: slug}
 
-      - uses: docker/setup-qemu-action@v1 # Action page: <https://github.com/docker/setup-qemu-action>
+      - uses: docker/setup-qemu-action@v2 # Action page: <https://github.com/docker/setup-qemu-action>
 
-      - uses: docker/setup-buildx-action@v1 # Action page: <https://github.com/docker/setup-buildx-action>
+      - uses: docker/setup-buildx-action@v2 # Action page: <https://github.com/docker/setup-buildx-action>
 
-      - uses: docker/login-action@v1 # Action page: <https://github.com/docker/login-action>
+      - uses: docker/login-action@v2 # Action page: <https://github.com/docker/login-action>
         with:
           username: ${{ secrets.DOCKER_LOGIN }}
           password: ${{ secrets.DOCKER_PASSWORD }}
 
-      - uses: docker/login-action@v1 # Action page: <https://github.com/docker/login-action>
+      - uses: docker/login-action@v2 # Action page: <https://github.com/docker/login-action>
         with:
           registry: ghcr.io
           username: ${{ github.actor }}
-          password: ${{ secrets.GHCR_PASSWORD }}
+          password: ${{ secrets.GITHUB_TOKEN }}
 
-      - uses: docker/build-push-action@v2 # Action page: <https://github.com/docker/build-push-action>
+      - uses: docker/build-push-action@v4 # Action page: <https://github.com/docker/build-push-action>
         with:
           context: .
           file: Dockerfile
@@ -75,17 +85,20 @@ jobs:
           build-args: "APP_VERSION=${{ steps.slug.outputs.version }}"
           tags: |
             tarampampam/error-pages:${{ steps.slug.outputs.version }}
+            tarampampam/error-pages:${{ steps.slug.outputs.version-major }}.${{ steps.slug.outputs.version-minor }}
+            tarampampam/error-pages:${{ steps.slug.outputs.version-major }}
             tarampampam/error-pages:latest
             ghcr.io/${{ github.actor }}/${{ github.event.repository.name }}:${{ steps.slug.outputs.version }}
+            ghcr.io/${{ github.actor }}/${{ github.event.repository.name }}:${{ steps.slug.outputs.version-major }}.${{ steps.slug.outputs.version-minor }}
+            ghcr.io/${{ github.actor }}/${{ github.event.repository.name }}:${{ steps.slug.outputs.version-major }}
             ghcr.io/${{ github.actor }}/${{ github.event.repository.name }}:latest
 
   demo:
     name: Update the demonstration
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     needs: [docker-image]
     steps:
-      - uses: gacts/github-slug@v1
-        id: slug
+      - {uses: gacts/github-slug@v1, id: slug}
 
       - name: Take rendered templates from the built docker image
         run: |

.github/workflows/tests.yml

@@ -8,36 +8,41 @@ on:
   pull_request:
     paths-ignore: ['**.md']
 
+concurrency:
+  group: ${{ github.ref }}
+  cancel-in-progress: true
+
 jobs: # Docs: <https://git.io/JvxXE>
   gitleaks:
     name: Gitleaks
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     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>
+      - name: Check for GitLeaks
+        uses: gacts/gitleaks@v1 # Action page: <https://github.com/gacts/gitleaks>
 
   golangci-lint:
     name: Golang-CI (lint)
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
-      - name: Run linter
-        uses: golangci/golangci-lint-action@v2 # Action page: <https://github.com/golangci/golangci-lint-action>
-        with:
-          version: v1.44 # without patch version
-          only-new-issues: false # show only new issues if it's a pull request
+      - uses: gacts/setup-go-with-cache@v1
+        with: {go-version: 1.19}
+
+      - uses: golangci/golangci-lint-action@v3
+        with: {skip-pkg-cache: true, skip-build-cache: true}
 
   validate-config-file:
     name: Validate config file
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
-      - uses: actions/setup-node@v2
-        with: {node-version: '16'}
+      - uses: gacts/setup-node-with-cache@v1
+        with: {node-version: 16}
 
       - name: Install linter
         run: npm install -g ajv-cli # Package page: <https://www.npmjs.com/package/ajv-cli>
@@ -45,31 +50,36 @@ jobs: # Docs: <https://git.io/JvxXE>
       - 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-latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - uses: gacts/setup-node-with-cache@v1
+        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
+    runs-on: ubuntu-latest
     steps:
-      - uses: actions/setup-go@v2
-        with: {go-version: 1.17}
-
-      - 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>
-        uses: actions/cache@v2
-        id: go-cache
-        with:
-          path: ~/go/pkg/mod
-          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-          restore-keys: ${{ runner.os }}-go-
-
-      - if: steps.go-cache.outputs.cache-hit != 'true'
-        run: go mod download
+      - uses: gacts/setup-go-with-cache@v1
+        with: {go-version-file: go.mod}
 
       - name: Run Unit tests
         run: go test -race -covermode=atomic -coverprofile /tmp/coverage.txt ./...
 
-      - uses: codecov/codecov-action@v2 # https://github.com/codecov/codecov-action
+      - uses: codecov/codecov-action@v3 # https://github.com/codecov/codecov-action
         continue-on-error: true
         with:
           file: /tmp/coverage.txt
@@ -77,7 +87,7 @@ jobs: # Docs: <https://git.io/JvxXE>
 
   build:
     name: Build for ${{ matrix.os }} (${{ matrix.arch }})
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
@@ -85,36 +95,26 @@ jobs: # Docs: <https://git.io/JvxXE>
         arch: [amd64]  # amd64, 386
     needs: [golangci-lint, go-test, validate-config-file]
     steps:
-      - uses: actions/setup-go@v2
-        with: {go-version: 1.17}
+      - uses: actions/checkout@v3
 
-      - uses: actions/checkout@v2
+      - uses: gacts/setup-go-with-cache@v1
+        with: {go-version-file: go.mod}
 
-      - uses: gacts/github-slug@v1
-        id: slug
-
-      - name: Go modules Cache # Docs: <https://git.io/JfAKn#go---modules>
-        uses: actions/cache@v2
-        with:
-          path: ~/go/pkg/mod
-          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-          restore-keys: ${{ runner.os }}-go-
-
-      - run: go mod download
+      - {uses: gacts/github-slug@v1, id: slug}
 
       - name: Build application
         env:
           GOOS: ${{ matrix.os }}
           GOARCH: ${{ matrix.arch }}
           CGO_ENABLED: 0
-          LDFLAGS: -s -w -X github.com/tarampampam/error-pages/internal/version.version=${{ steps.slug.outputs.branch-name-slug }}@${{ steps.slug.outputs.commit-hash-short }}
+          LDFLAGS: -s -w -X gh.tarampamp.am/error-pages/internal/version.version=${{ steps.slug.outputs.branch-name-slug }}@${{ steps.slug.outputs.commit-hash-short }}
         run: go build -trimpath -ldflags "$LDFLAGS" -o ./error-pages ./cmd/error-pages/
 
       - name: Try to execute
         if: matrix.os == 'linux'
-        run: ./error-pages version && ./error-pages -h
+        run: ./error-pages --version && ./error-pages -h
 
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v3
         with:
           name: error-pages-${{ matrix.os }}-${{ matrix.arch }}
           path: error-pages
@@ -123,12 +123,12 @@ jobs: # Docs: <https://git.io/JvxXE>
 
   generate:
     name: Run templates generator
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     needs: [build]
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
-      - uses: actions/download-artifact@v2
+      - uses: actions/download-artifact@v3
         with:
           name: error-pages-linux-amd64
           path: .artifact
@@ -138,7 +138,7 @@ jobs: # Docs: <https://git.io/JvxXE>
         run: mv ./error-pages ./../error-pages && chmod +x ./../error-pages
 
       - name: Run generator
-        run: ./error-pages build ./out --verbose --index
+        run: ./error-pages --verbose build --index ./out
 
       - name: Test files creation
         run: |
@@ -150,18 +150,21 @@ jobs: # Docs: <https://git.io/JvxXE>
           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
+    runs-on: ubuntu-latest
     needs: [golangci-lint, go-test, validate-config-file]
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
-      - uses: gacts/github-slug@v1
-        id: slug
+      - {uses: gacts/github-slug@v1, id: slug}
 
-      - uses: docker/build-push-action@v2 # Action page: <https://github.com/docker/build-push-action>
+      - uses: docker/build-push-action@v4 # Action page: <https://github.com/docker/build-push-action>
         with:
           context: .
           file: Dockerfile
@@ -171,7 +174,7 @@ jobs: # Docs: <https://git.io/JvxXE>
 
       - run: docker save app:ci > ./docker-image.tar
 
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v3
         with:
           name: docker-image
           path: ./docker-image.tar
@@ -179,34 +182,38 @@ jobs: # Docs: <https://git.io/JvxXE>
 
   scan-docker-image:
     name: Scan the docker image
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     needs: [docker-image]
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3 # is needed for `upload-sarif` action
 
-      - uses: actions/download-artifact@v2
+      - uses: actions/download-artifact@v3
         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@0.8.0 # 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@v2
+        if: always()
+        continue-on-error: true
+        with: {sarif_file: trivy-results.sarif}
 
   poke-docker-image:
     name: Run the docker image
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     needs: [docker-image]
     timeout-minutes: 2
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
-      - uses: actions/download-artifact@v2
+      - uses: actions/download-artifact@v3
         with:
           name: docker-image
           path: .artifact
@@ -214,21 +221,15 @@ 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
+      - uses: gacts/install-hurl@v1
 
       - name: Run container with the app
-        run: docker run --rm -d -p "8080:8080/tcp" -e "SHOW_DETAILS=true" --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: hurl --color --test --fail-at-end --variable host=127.0.0.1 --variable port=8080 --summary ./test/hurl/*.hurl
+      - run: hurl --color --test --fail-at-end --variable host=127.0.0.1 --variable port=8080 ./test/hurl/*.hurl
 
       - name: Stop the container
         if: always()

.golangci.yml

@@ -42,8 +42,7 @@ 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
-    - bodyclose # Checks whether HTTP response body is closed successfully
-    - deadcode # Finds unused code
+    - bidichk # Checks for dangerous unicode character sequences
     - 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())
     - dupl # Tool for code clone detection
@@ -71,19 +70,13 @@ linters: # All available linters list: <https://golangci-lint.run/usage/linters/
     - nakedret # Finds naked returns in functions greater than a specified function length
     - nestif # Reports deeply nested if statements
     - nlreturn # checks for a new line before return and branch statements to increase code clarity
-    - noctx # finds sending http request without context.Context
     - nolintlint # Reports ill-formed or insufficient nolint directives
     - prealloc # Finds slice declarations that could potentially be preallocated
-    - rowserrcheck # Checks whether Err of rows is checked successfully
     - staticcheck # Staticcheck is a go vet on steroids, applying a ton of static analysis checks
-    - structcheck # Finds unused struct fields
     - stylecheck # Stylecheck is a replacement for golint
-    - tparallel # detects inappropriate usage of t.Parallel() method in your Go test codes
     - typecheck # Like the front-end of a Go compiler, parses and type-checks Go code
     - unconvert # Remove unnecessary type conversions
-    - unparam # Reports unused function parameters
     - unused # Checks Go code for unused constants, variables, functions and types
-    - varcheck # Finds unused global variables and constants
     - whitespace # Tool for detection of leading and trailing whitespace
     - wsl # Whitespace Linter - Forces you to use empty lines!
 
@@ -95,4 +88,3 @@ issues:
         - funlen
         - scopelint
         - gocognit
-        - noctx

.grype.yaml

@@ -1,3 +0,0 @@
-ignore:
-  # temporary ignore this CVE as false positive on the Go package
-  - vulnerability: CVE-2015-5237

CHANGELOG.md

@@ -4,12 +4,221 @@ 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].
 
+## v2.21.0
+
+### Changed
+
+- Go updated from `1.19` up to `1.20`
+- Go dependencies updated
+- Module name changed from `github.com/tarampampam/error-pages` to `gh.tarampamp.am/error-pages`
+
+## v2.20.0
+
+### Changed
+
+- `version` subcommand replaced by `--version` flag [#163]
+- `--config-file` flag is not global anymore (use `error-pages (serve|build) --config-file ...` instead of `error-pages --config-file ... (serve|build) ...`) [#163]
+- Flags `--verbose`, `--debug` and `--log-json` are deprecated, use `--log-level` and `--log-format` instead [#163]
+
+### Added
+
+- Possibility to use custom env variables in templates [#164], [#165]
+
+[#164]:https://github.com/tarampampam/error-pages/issues/164
+[#165]:https://github.com/tarampampam/error-pages/pull/165
+[#163]:https://github.com/tarampampam/error-pages/pull/163
+
+## v2.19.0
+
+### Changed
+
+- Go updated from `1.18` up to `1.19`
+
+### Added
+
+- Error pages now translated into Chinese 🇨🇳 [#147]
+
+[#147]:https://github.com/tarampampam/error-pages/pull/147
+
+## v2.18.0
+
+### Changed
+
+- Replaced `fonts.googleapis.com` by `fonts.bunny.net` regarding GDPR compliance [#131]
+
+[#131]:https://github.com/tarampampam/error-pages/pull/131
+
+## v2.17.0
+
+### Added
+
+- Error pages now translated into Spanish 🇪🇸 [#124]
+
+[#124]:https://github.com/tarampampam/error-pages/pull/124
+
+## v2.16.0
+
+### Added
+
+- Error pages are now translated into German 🇩🇪 [#115]
+
+[#115]:https://github.com/tarampampam/error-pages/pull/115
+
+## v2.15.0
+
+### Added
+
+- Error pages now translated into Dutch 🇳🇱 [#104]
+
+[#104]:https://github.com/tarampampam/error-pages/pull/104
+
+## v2.14.0
+
+### Added
+
+- Error pages now translated into Portuguese 🇵🇹 [#103]
+
+### Changed
+
+- Go updated from `1.18.0` up to `1.18.1`
+
+[#103]:https://github.com/tarampampam/error-pages/pull/103
+
+## v2.13.0
+
+### Added
+
+- Possibility to disable error pages auto-localization (using `--disable-l10n` flag for the `serve` & `build` commands or environment variable `DISABLE_L10N`) [#91]
+
+### Fixed
+
+- User UID/GID changed to the numeric values in the dockerfile [#92]
+
+[#92]:https://github.com/tarampampam/error-pages/issues/92
+[#91]:https://github.com/tarampampam/error-pages/issues/91
+
+## v2.12.1
+
+### Fixed
+
+- Fix translation 🇫🇷 [#86]
+
+[#85]:https://github.com/tarampampam/error-pages/pull/86
+
+## v2.12.0
+
+### Changed
+
+- Error pages now translated into 🇫🇷 [#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 into 🇺🇦 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 ad deprecated) [#49]
+- Health-check route become `/healthz` (instead `/health/live`, previous route marked as deprecated) [#49]
 
 ### Added
 

Dockerfile

@@ -1,7 +1,7 @@
 # syntax=docker/dockerfile:1.2
 
 # Image page: <https://hub.docker.com/_/golang>
-FROM golang:1.17.5-alpine as builder
+FROM golang:1.20-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"
@@ -11,12 +11,12 @@ WORKDIR /src
 COPY . .
 
 # arguments to pass on each go tool link invocation
-ENV LDFLAGS="-s -w -X github.com/tarampampam/error-pages/internal/version.version=$APP_VERSION"
+ENV LDFLAGS="-s -w -X gh.tarampamp.am/error-pages/internal/version.version=$APP_VERSION"
 
 RUN set -x \
     && go version \
     && CGO_ENABLED=0 go build -trimpath -ldflags "$LDFLAGS" -o ./error-pages ./cmd/error-pages/ \
-    && ./error-pages version \
+    && ./error-pages --version \
     && ./error-pages -h
 
 WORKDIR /tmp/rootfs
@@ -38,7 +38,7 @@ WORKDIR /tmp/rootfs/opt
 
 # generate static error pages (for usage inside another docker images, for example)
 RUN set -x \
-    && ./../bin/error-pages --config-file ./error-pages.yml build ./html --verbose --index \
+    && ./../bin/error-pages --verbose build --config-file ./error-pages.yml --index ./html \
     && ls -l ./html
 
 # use empty filesystem
@@ -60,7 +60,7 @@ LABEL \
 COPY --from=builder /tmp/rootfs /
 
 # Use an unprivileged user
-USER appuser:appuser
+USER 10001:10001
 
 WORKDIR /opt
 
@@ -68,11 +68,12 @@ ENV LISTEN_PORT="8080" \
     TEMPLATE_NAME="ghost" \
     DEFAULT_ERROR_PAGE="404" \
     DEFAULT_HTTP_CODE="404" \
-    SHOW_DETAILS="false"
+    SHOW_DETAILS="false" \
+    DISABLE_L10N="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", "--log-json", "healthcheck"]
 
 ENTRYPOINT ["/bin/error-pages"]
 
-CMD ["serve", "--log-json"]
+CMD ["--log-json", "serve"]

Makefile

@@ -3,7 +3,7 @@
 # Makefile readme (en): <https://www.gnu.org/software/make/manual/html_node/index.html#SEC_Contents>
 
 SHELL = /bin/sh
-LDFLAGS = "-s -w -X github.com/tarampampam/error-pages/internal/version.version=$(shell git rev-parse HEAD)"
+LDFLAGS = "-s -w -X gh.tarampamp.am/error-pages/internal/version.version=$(shell git rev-parse HEAD)"
 
 DC_RUN_ARGS = --rm --user "$(shell id -u):$(shell id -g)"
 APP_NAME = $(notdir $(CURDIR))
@@ -43,7 +43,7 @@ gotest: ## Run app tests
 	docker-compose run $(DC_RUN_ARGS) --no-deps app go test -v -race -timeout 10s ./...
 
 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
+	docker-compose run --rm hurl --color --test --fail-at-end --variable host=web --variable port=8080 ./test/hurl/*.hurl
 
 test: lint gotest int-test ## Run app tests and linters
 

README.md

@@ -1,43 +1,45 @@
 <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/actions/workflow/status/tarampampam/error-pages/tests.yml?branch=master&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/actions/workflow/status/tarampampam/error-pages/release.yml?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]][releases]
-![Project language][badge-lang]
-[![Build Status][badge-ci-build]][actions-page]
-[![Release Status][badge-ci-release]][actions-page]
-[![Coverage][badge-coverage]][coverage]
-[![Image size][badge-image-size]][docker-hub]
-[![License][badge-license]][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
+- 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])
 
 ## 🔥 Features list
 
-- HTTP server written on 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 is `json` and `xml`)
+- 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 _(~3.7Mb compressed size)_, distroless and uses the unleveled user by default
+- 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!)
 
 ## 🧩 Install
 
 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)][docker-hub-tags]
-
 | Registry                          | Image                             |
 |-----------------------------------|-----------------------------------|
 | [Docker Hub][docker-hub]          | `tarampampam/error-pages`         |
@@ -45,6 +47,11 @@ Download the latest binary file for your os/arch from the [releases page][releas
 
 > 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
 
+💣 **Or** you can download **already rendered** error pages pack as a [zip][pages-pack-zip] or [tar.gz][pages-pack-tar-gz] archive.
+
+[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:
@@ -53,7 +60,7 @@ Please, take a look at [our Wiki][wiki] for the common usage stories:
 - [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 Traekik and local Docker Compose][wiki-traefik-docker-compose] (it's a good starting point for the tests)
+- [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]
 
@@ -80,25 +87,26 @@ $ ulimit -aH | grep file
 -n: file descriptors                1048576
 -x: file locks                      unlimited
 
-$ wrk --version | head -n 1
-wrk 4.2.0 [epoll] Copyright (C) 2012 Will Glozer
+$ docker run --rm -p "8080:8080/tcp" -e "SHOW_DETAILS=true" error-pages:local # in separate terminal
 
-$ wrk -t12 -c400 -d30s http://127.0.0.1:8080/500.html
-Running 30s test @ http://127.0.0.1:8080/500.html
+$ 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    50.06ms   61.15ms 655.79ms   85.54%
-    Req/Sec     1.07k   363.14     2.40k    69.24%
-  383014 requests in 30.08s, 2.14GB read
-Requests/sec:  12731.07
-Transfer/sec:     72.79MB
+    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
 ```
 
-FS & memory usage stats during the test:
+<details>
+  <summary>FS & memory usage stats during the test</summary>
 
-<p align="center">
-  <img src="https://hsto.org/webt/dy/2e/_8/dy2e_8xkefxre7z5w7xcorjldmm.png" alt="" />
-</p>
+  <p align="center">
+    <img src="https://hsto.org/webt/ts/w-/lz/tsw-lznvru0ngjneiimkwq7ysyc.png" alt="" />
+  </p>
+</details>
 
 ## 🪂 Templates
 
@@ -111,12 +119,16 @@ FS & memory usage stats during the test:
 |      `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
 
 [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/xc/iq/vt/xciqvty-aoj-rchfarsjhutpjny.png
+[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
@@ -128,6 +140,14 @@ FS & memory usage stats during the test:
 [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
 
 ## 🦾 Contributors
 
@@ -155,20 +175,12 @@ If you find any bugs in the project, please [create an issue][new-issue] in the
 
 This is open-sourced software licensed under the [MIT License][license].
 
-[badge-ci-build]:https://img.shields.io/github/workflow/status/tarampampam/error-pages/tests?maxAge=30&label=tests&logo=github
-[badge-ci-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]:https://img.shields.io/github/release/tarampampam/error-pages.svg?maxAge=30
-[badge-image-size]:https://img.shields.io/docker/image-size/tarampampam/error-pages/latest?maxAge=30
-[badge-lang]: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]: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
 
-[coverage]:https://codecov.io/gh/tarampampam/error-pages
-[actions-page]:https://github.com/tarampampam/error-pages/actions
 [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

cmd/error-pages/main.go

@@ -5,9 +5,14 @@ import (
 	"path/filepath"
 
 	"github.com/fatih/color"
-	"github.com/tarampampam/error-pages/internal/cli"
+	"go.uber.org/automaxprocs/maxprocs"
+
+	"gh.tarampamp.am/error-pages/internal/cli"
 )
 
+// set GOMAXPROCS to match Linux container CPU quota.
+var _, _ = maxprocs.Set(maxprocs.Min(1), maxprocs.Logger(func(_ string, _ ...any) {}))
+
 // exitFn is a function for application exiting.
 var exitFn = os.Exit //nolint:gochecknoglobals
 
@@ -17,9 +22,7 @@ func main() { exitFn(run()) }
 // run this CLI application.
 // Exit codes documentation: <https://tldp.org/LDP/abs/html/exitcodes.html>
 func run() int {
-	cmd := cli.NewCommand(filepath.Base(os.Args[0]))
-
-	if err := cmd.Execute(); err != nil {
+	if err := (cli.NewApp(filepath.Base(os.Args[0]))).Run(os.Args); err != nil {
 		_, _ = color.New(color.FgHiRed, color.Bold).Fprintln(os.Stderr, err.Error())
 
 		return 1

cmd/error-pages/main_test.go

@@ -6,36 +6,16 @@ import (
 
 	"github.com/kami-zh/go-capturer"
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
-func Test_Main(t *testing.T) {
+func Test_MainHelp(t *testing.T) {
 	os.Args = []string{"", "--help"}
-	exitFn = func(code int) { assert.Equal(t, 0, code) }
+	exitFn = func(code int) { require.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")
+	assert.Contains(t, output, "USAGE:")
+	assert.Contains(t, output, "COMMANDS:")
+	assert.Contains(t, output, "GLOBAL OPTIONS:")
 }

docker-compose.yml

@@ -4,11 +4,12 @@ version: '3.8'
 
 volumes:
   tmp-data: {}
+  golint-go: {}
   golint-cache: {}
 
 services:
   app: &app-service
-    image: golang:1.17.5-buster # Image page: <https://hub.docker.com/_/golang>
+    image: golang:1.20-buster # Image page: <https://hub.docker.com/_/golang>
     working_dir: /src
     environment:
       HOME: /tmp
@@ -18,39 +19,35 @@ services:
       - /etc/group:/etc/group:ro
       - .:/src:rw
       - tmp-data:/tmp:rw
+    security_opt: [no-new-privileges:true]
 
   web:
     <<: *app-service
     ports:
       - "8080:8080/tcp" # Open <http://127.0.0.1:8080>
-    command:
-      - go
-      - run
-      - ./cmd/error-pages
-      - serve
-      - --verbose
-      - --port=8080
-      - --show-details
+    command: sh -c "go build -buildvcs=false -o /tmp/app ./cmd/error-pages && /tmp/app serve --show-details --proxy-headers=X-Foo,Bar,Baz_blah"
     healthcheck:
-      test: ['CMD', 'wget', '--spider', '-q', 'http://127.0.0.1:8080/healthz']
-      interval: 5s
-      timeout: 2s
+      test: ['CMD', '/tmp/app', '--log-json', 'healthcheck']
+      interval: 4s
+      start_period: 5s
+      retries: 5
 
   golint:
-    image: golangci/golangci-lint:v1.44-alpine # Image page: <https://hub.docker.com/r/golangci/golangci-lint>
+    image: golangci/golangci-lint:v1.51-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:
-      - .:/src:ro
+      - golint-go:/go:rw # go dependencies will be downloaded on each run without this
       - golint-cache:/tmp/golint:rw
+      - .:/src:ro
     working_dir: /src
-    command: /bin/true
+    security_opt: [no-new-privileges:true]
 
   hurl:
-    image: orangeopensource/hurl:1.5.0
+    image: orangeopensource/hurl:1.8.0
     volumes:
       - .:/src:ro
     working_dir: /src
     depends_on:
-      web:
-        condition: service_healthy
+      web: {condition: service_healthy}
+    security_opt: [no-new-privileges:true]

error-pages.yml

@@ -11,6 +11,10 @@ templates:
   - 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:
@@ -21,7 +25,9 @@ formats:
         "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 }},
@@ -39,7 +45,9 @@ formats:
         <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>

go.mod

@@ -1,41 +1,48 @@
-module github.com/tarampampam/error-pages
+module gh.tarampamp.am/error-pages
 
-go 1.17
+go 1.20
 
 require (
-	github.com/a8m/envsubst v1.3.0
-	github.com/fasthttp/router v1.4.4
-	github.com/fatih/color v1.13.0
+	github.com/a8m/envsubst v1.4.2
+	github.com/fasthttp/router v1.4.16
+	github.com/fatih/color v1.14.1
 	github.com/kami-zh/go-capturer v0.0.0-20171211120116-e492ea43421d
 	github.com/pkg/errors v0.9.1
-	github.com/prometheus/client_golang v1.12.0
-	github.com/prometheus/client_model v0.2.0
-	github.com/spf13/cobra v1.3.0
-	github.com/spf13/pflag v1.0.5
-	github.com/stretchr/testify v1.7.0
-	github.com/valyala/fasthttp v1.31.0
-	go.uber.org/zap v1.19.1
-	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b
+	github.com/prometheus/client_golang v1.14.0
+	github.com/prometheus/client_model v0.3.0
+	github.com/stretchr/testify v1.8.1
+	github.com/urfave/cli/v2 v2.24.4
+	github.com/valyala/fasthttp v1.44.0
+	go.uber.org/automaxprocs v1.5.1
+	go.uber.org/goleak v1.2.0
+	go.uber.org/zap v1.24.0
+	gopkg.in/yaml.v3 v3.0.1
 )
 
 require (
-	github.com/andybalholm/brotli v1.0.3 // indirect
+	github.com/andybalholm/brotli v1.0.5 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
-	github.com/cespare/xxhash/v2 v2.1.2 // indirect
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/cpuguy83/go-md2man/v2 v2.0.2 // 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 v0.1.12 // indirect
-	github.com/mattn/go-isatty v0.0.14 // indirect
-	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/compress v1.15.15 // indirect
+	github.com/kr/text v0.2.0 // indirect
+	github.com/mattn/go-colorable v0.1.13 // indirect
+	github.com/mattn/go-isatty v0.0.17 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
+	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
+	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/prometheus/common v0.32.1 // indirect
-	github.com/prometheus/procfs v0.7.3 // indirect
-	github.com/savsgio/gotils v0.0.0-20210921075833-21a6215cb0e4 // indirect
+	github.com/prometheus/common v0.40.0 // indirect
+	github.com/prometheus/procfs v0.9.0 // indirect
+	github.com/russross/blackfriday/v2 v2.1.0 // indirect
+	github.com/savsgio/gotils v0.0.0-20230208104028-c358bd845dee // 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 v0.0.0-20220114195835-da31bd327af9 // indirect
-	google.golang.org/protobuf v1.27.1 // indirect
+	github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673 // indirect
+	go.uber.org/atomic v1.10.0 // indirect
+	go.uber.org/multierr v1.9.0 // indirect
+	golang.org/x/sys v0.5.0 // indirect
+	google.golang.org/protobuf v1.28.1 // indirect
 )

go.sum

@@ -1,840 +1,124 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
-cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
-cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
-cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
-cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
-cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
-cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
-cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
-cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
-cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
-cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
-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 v0.83.0/go.mod h1:Z7MJUsANfY0pYPdw0lbnivPx4/vhy/e2FEkSkF7vAVY=
-cloud.google.com/go v0.84.0/go.mod h1:RazrYuxIK6Kb7YrzzhPoLmCVzl7Sup4NrbKPg8KHSUM=
-cloud.google.com/go v0.87.0/go.mod h1:TpDYlFy7vuLzZMMZ+B6iRiELaY7z/gJPaqbMx6mlWcY=
-cloud.google.com/go v0.90.0/go.mod h1:kRX0mNRHe0e2rC6oNakvwQqzyDmg57xJ+SZU1eT2aDQ=
-cloud.google.com/go v0.93.3/go.mod h1:8utlLll2EF5XMAV15woO4lSbWQlk8rer9aLOfLh7+YI=
-cloud.google.com/go v0.94.1/go.mod h1:qAlAugsXlC+JWO+Bke5vCtc9ONxjQT3drlTTnAplMW4=
-cloud.google.com/go v0.97.0/go.mod h1:GF7l59pYBVlXQIBLx3a761cZ41F9bBH3JUlihCt2Udc=
-cloud.google.com/go v0.98.0/go.mod h1:ua6Ush4NALrHk5QXDWnjvZHN93OuF0HfuEPq9I1X0cM=
-cloud.google.com/go v0.99.0/go.mod h1:w0Xx2nLzqWJPuozYQX+hFfCSI8WioryfRDzkoI/Y2ZA=
-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=
-cloud.google.com/go/bigquery v1.5.0/go.mod h1:snEHRnqQbz117VIFhE8bmtwIDY80NLUZUMb4Nv6dBIg=
-cloud.google.com/go/bigquery v1.7.0/go.mod h1://okPTzCYNXSlb24MZs83e2Do+h+VXtc4gLoIoXIAPc=
-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 v1.6.1/go.mod h1:asNXNOzBdyVQmEU+ggO8UPodTkEVFW5Qx+rwHnAz+EY=
-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=
-cloud.google.com/go/pubsub v1.3.1/go.mod h1:i+ucay31+CNRpDW4Lu78I4xXG+O1r/MAHgjpRVR+TSU=
-cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
-cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos=
-cloud.google.com/go/storage v1.6.0/go.mod h1:N7U0C8pVQ/+NIKOBQyamJIeKQKkZ+mxpohlUTyfDhBk=
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-dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
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-google.golang.org/genproto v0.0.0-20210821163610-241b8fcbd6c8/go.mod h1:eFjDcFEctNawg4eG61bRv87N7iHBWyVhJu7u1kqDUXY=
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-google.golang.org/genproto v0.0.0-20210831024726-fe130286e0e2/go.mod h1:eFjDcFEctNawg4eG61bRv87N7iHBWyVhJu7u1kqDUXY=
-google.golang.org/genproto v0.0.0-20210903162649-d08c68adba83/go.mod h1:eFjDcFEctNawg4eG61bRv87N7iHBWyVhJu7u1kqDUXY=
-google.golang.org/genproto v0.0.0-20210909211513-a8c4777a87af/go.mod h1:eFjDcFEctNawg4eG61bRv87N7iHBWyVhJu7u1kqDUXY=
-google.golang.org/genproto v0.0.0-20210924002016-3dee208752a0/go.mod h1:5CzLGKJ67TSI2B9POpiiyGha0AjJvZIUgRMt1dSmuhc=
-google.golang.org/genproto v0.0.0-20211008145708-270636b82663/go.mod h1:5CzLGKJ67TSI2B9POpiiyGha0AjJvZIUgRMt1dSmuhc=
-google.golang.org/genproto v0.0.0-20211028162531-8db9c33dc351/go.mod h1:5CzLGKJ67TSI2B9POpiiyGha0AjJvZIUgRMt1dSmuhc=
-google.golang.org/genproto v0.0.0-20211118181313-81c1377c94b1/go.mod h1:5CzLGKJ67TSI2B9POpiiyGha0AjJvZIUgRMt1dSmuhc=
-google.golang.org/genproto v0.0.0-20211129164237-f09f9a12af12/go.mod h1:5CzLGKJ67TSI2B9POpiiyGha0AjJvZIUgRMt1dSmuhc=
-google.golang.org/genproto v0.0.0-20211203200212-54befc351ae9/go.mod h1:5CzLGKJ67TSI2B9POpiiyGha0AjJvZIUgRMt1dSmuhc=
-google.golang.org/genproto v0.0.0-20211206160659-862468c7d6e0/go.mod h1:5CzLGKJ67TSI2B9POpiiyGha0AjJvZIUgRMt1dSmuhc=
-google.golang.org/genproto v0.0.0-20211208223120-3a66f561d7aa/go.mod h1:5CzLGKJ67TSI2B9POpiiyGha0AjJvZIUgRMt1dSmuhc=
-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=
-google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
-google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQciAY=
-google.golang.org/grpc v1.26.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
-google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
-google.golang.org/grpc v1.27.1/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
-google.golang.org/grpc v1.28.0/go.mod h1:rpkK4SK4GF4Ach/+MFLZUBavHOvF2JJB5uozKKal+60=
-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 v1.37.0/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
-google.golang.org/grpc v1.37.1/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
-google.golang.org/grpc v1.38.0/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
-google.golang.org/grpc v1.39.0/go.mod h1:PImNr+rS9TWYb2O4/emRugxiyHZ5JyHW5F+RPnDzfrE=
-google.golang.org/grpc v1.39.1/go.mod h1:PImNr+rS9TWYb2O4/emRugxiyHZ5JyHW5F+RPnDzfrE=
-google.golang.org/grpc v1.40.0/go.mod h1:ogyxbiOoUXAkP+4+xa6PZSE9DZgIHtSpzjDTB9KAK34=
-google.golang.org/grpc v1.40.1/go.mod h1:ogyxbiOoUXAkP+4+xa6PZSE9DZgIHtSpzjDTB9KAK34=
-google.golang.org/grpc v1.42.0/go.mod h1:k+4IHHFw41K8+bbowsex27ge2rCb65oeWqe4jJ590SU=
-google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.1.0/go.mod h1:6Kw0yEErY5E/yWrBtf03jp27GLLJujG4z/JK95pnjjw=
-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=
-google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
-google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
-google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
-google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
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-google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4=
-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=
+google.golang.org/protobuf v1.28.1 h1:d0NfwRgPtno5B1Wa6L2DAG+KivqkdutMf1UhdNx175w=
+google.golang.org/protobuf v1.28.1/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-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 v1.66.2/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
-gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
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-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=
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-gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
+gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c h1:Hei/4ADfdWqJk1ZMxUNpqntNwaWcugrBjAiHlqqRiVk=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
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-honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
-honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
-honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
-rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
-rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
-rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

internal/breaker/os_signal_test.go

@@ -8,7 +8,8 @@ import (
 	"time"
 
 	"github.com/stretchr/testify/assert"
-	"github.com/tarampampam/error-pages/internal/breaker"
+
+	"gh.tarampamp.am/error-pages/internal/breaker"
 )
 
 func TestNewOSSignals(t *testing.T) {

internal/checkers/health_test.go

@@ -3,12 +3,13 @@ package checkers_test
 import (
 	"bytes"
 	"context"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
-	"github.com/tarampampam/error-pages/internal/checkers"
+
+	"gh.tarampamp.am/error-pages/internal/checkers"
 )
 
 type httpClientFunc func(*http.Request) (*http.Response, error)
@@ -22,7 +23,7 @@ func TestHealthChecker_CheckSuccess(t *testing.T) {
 		assert.Equal(t, "HealthChecker/internal", req.Header.Get("User-Agent"))
 
 		return &http.Response{
-			Body:       ioutil.NopCloser(bytes.NewReader([]byte{})),
+			Body:       io.NopCloser(bytes.NewReader([]byte{})),
 			StatusCode: http.StatusOK,
 		}, nil
 	}
@@ -35,7 +36,7 @@ func TestHealthChecker_CheckSuccess(t *testing.T) {
 func TestHealthChecker_CheckFail(t *testing.T) {
 	var httpMock httpClientFunc = func(req *http.Request) (*http.Response, error) {
 		return &http.Response{
-			Body:       ioutil.NopCloser(bytes.NewReader([]byte{})),
+			Body:       io.NopCloser(bytes.NewReader([]byte{})),
 			StatusCode: http.StatusBadGateway,
 		}, nil
 	}

internal/checkers/live_test.go

@@ -4,7 +4,8 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
-	"github.com/tarampampam/error-pages/internal/checkers"
+
+	"gh.tarampamp.am/error-pages/internal/checkers"
 )
 
 func TestLiveChecker_Check(t *testing.T) {

internal/cli/app.go

@@ -0,0 +1,103 @@
+package cli
+
+import (
+	"context"
+	"fmt"
+	"runtime"
+	"strings"
+
+	"github.com/urfave/cli/v2"
+
+	"gh.tarampamp.am/error-pages/internal/checkers"
+	"gh.tarampamp.am/error-pages/internal/cli/build"
+	"gh.tarampamp.am/error-pages/internal/cli/healthcheck"
+	"gh.tarampamp.am/error-pages/internal/cli/serve"
+	"gh.tarampamp.am/error-pages/internal/env"
+	"gh.tarampamp.am/error-pages/internal/logger"
+	"gh.tarampamp.am/error-pages/internal/version"
+)
+
+// NewApp creates new console application.
+func NewApp(appName string) *cli.App { //nolint:funlen
+	const (
+		logLevelFlagName  = "log-level"
+		logFormatFlagName = "log-format"
+		verboseFlagName   = "verbose"
+		debugFlagName     = "debug"
+		logJSONFlagName   = "log-json"
+
+		defaultLogLevel  = logger.InfoLevel
+		defaultLogFormat = logger.ConsoleFormat
+	)
+
+	// create "default" logger (will be overwritten later with customized)
+	var log, _ = logger.New(defaultLogLevel, defaultLogFormat) // error will never occurs
+
+	return &cli.App{
+		Usage: appName,
+		Before: func(c *cli.Context) (err error) {
+			_ = log.Sync() // sync previous logger instance
+
+			var logLevel, logFormat = defaultLogLevel, defaultLogFormat //nolint:ineffassign
+
+			if c.Bool(verboseFlagName) || c.Bool(debugFlagName) {
+				logLevel = logger.DebugLevel
+			} else {
+				// parse logging level
+				if logLevel, err = logger.ParseLevel(c.String(logLevelFlagName)); err != nil {
+					return err
+				}
+			}
+
+			if c.Bool(logJSONFlagName) {
+				logFormat = logger.JSONFormat
+			} else {
+				// parse logging format
+				if logFormat, err = logger.ParseFormat(c.String(logFormatFlagName)); err != nil {
+					return err
+				}
+			}
+
+			configured, err := logger.New(logLevel, logFormat) // create new logger instance
+			if err != nil {
+				return err
+			}
+
+			*log = *configured // replace "default" logger with customized
+
+			return nil
+		},
+		Commands: []*cli.Command{
+			healthcheck.NewCommand(checkers.NewHealthChecker(context.TODO())),
+			build.NewCommand(log),
+			serve.NewCommand(log),
+		},
+		Version: fmt.Sprintf("%s (%s)", version.Version(), runtime.Version()),
+		Flags: []cli.Flag{ // global flags
+			&cli.BoolFlag{ // kept for backward compatibility
+				Name:  verboseFlagName,
+				Usage: "verbose output (DEPRECATED FLAG)",
+			},
+			&cli.BoolFlag{ // kept for backward compatibility
+				Name:  debugFlagName,
+				Usage: "debug output (DEPRECATED FLAG)",
+			},
+			&cli.BoolFlag{ // kept for backward compatibility
+				Name:  logJSONFlagName,
+				Usage: "logs in JSON format (DEPRECATED FLAG)",
+			},
+			&cli.StringFlag{
+				Name:    logLevelFlagName,
+				Value:   defaultLogLevel.String(),
+				Usage:   "logging level (`" + strings.Join(logger.LevelStrings(), "/") + "`)",
+				EnvVars: []string{env.LogLevel.String()},
+			},
+			&cli.StringFlag{
+				Name:    logFormatFlagName,
+				Value:   defaultLogFormat.String(),
+				Usage:   "logging format (`" + strings.Join(logger.FormatStrings(), "/") + "`)",
+				EnvVars: []string{env.LogFormat.String()},
+			},
+		},
+	}
+}

internal/cli/app_test.go

@@ -0,0 +1,19 @@
+package cli_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"gh.tarampamp.am/error-pages/internal/cli"
+)
+
+func TestNewCommand(t *testing.T) {
+	t.Parallel()
+
+	app := cli.NewApp("app")
+
+	assert.NotEmpty(t, app.Flags)
+
+	assert.NoError(t, app.Run([]string{"", "--log-level", "debug", "--log-format", "json"}))
+}

internal/cli/build/command.go

@@ -5,52 +5,59 @@ import (
 	"path"
 
 	"github.com/pkg/errors"
-	"github.com/spf13/cobra"
-	"github.com/tarampampam/error-pages/internal/config"
-	"github.com/tarampampam/error-pages/internal/tpl"
+	"github.com/urfave/cli/v2"
 	"go.uber.org/zap"
+
+	"gh.tarampamp.am/error-pages/internal/cli/shared"
+	"gh.tarampamp.am/error-pages/internal/config"
+	"gh.tarampamp.am/error-pages/internal/tpl"
 )
 
+type command struct {
+	c *cli.Command
+}
+
 // NewCommand creates `build` command.
-func NewCommand(log *zap.Logger, configFile *string) *cobra.Command {
-	var (
-		generateIndex bool
-		cfg           *config.Config
+func NewCommand(log *zap.Logger) *cli.Command {
+	var cmd = command{}
+
+	const (
+		generateIndexFlagName = "index"
+		disableL10nFlagName   = "disable-l10n"
 	)
 
-	cmd := &cobra.Command{
-		Use:     "build <output-directory>",
-		Aliases: []string{"b"},
-		Short:   "Build the error pages",
-		Args:    cobra.ExactArgs(1),
-		PreRunE: func(*cobra.Command, []string) (err error) {
-			if configFile == nil {
-				return errors.New("path to the config file is required for this command")
+	cmd.c = &cli.Command{
+		Name:        "build",
+		Aliases:     []string{"b"},
+		Usage:       "build <output-directory>",
+		Description: "Build the error pages",
+		Action: func(c *cli.Context) error {
+			cfg, cfgErr := config.FromYamlFile(c.String(shared.ConfigFileFlag.Name))
+			if cfgErr != nil {
+				return cfgErr
 			}
 
-			if cfg, err = config.FromYamlFile(*configFile); err != nil {
-				return err
-			}
-
-			return
-		},
-		RunE: func(_ *cobra.Command, args []string) error {
-			if len(args) != 1 {
+			if c.Args().Len() != 1 {
 				return errors.New("wrong arguments count")
 			}
 
-			return run(log, cfg, args[0], generateIndex)
+			return cmd.Run(log, cfg, c.Args().First(), c.Bool(generateIndexFlagName), c.Bool(disableL10nFlagName))
+		},
+		Flags: []cli.Flag{ // global flags
+			&cli.BoolFlag{
+				Name:    generateIndexFlagName,
+				Aliases: []string{"i"},
+				Usage:   "generate index page",
+			},
+			&cli.BoolFlag{
+				Name:  disableL10nFlagName,
+				Usage: "disable error pages localization",
+			},
+			shared.ConfigFileFlag,
 		},
 	}
 
-	cmd.Flags().BoolVarP(
-		&generateIndex,
-		"index", "i",
-		false,
-		"generate index page",
-	)
-
-	return cmd
+	return cmd.c
 }
 
 const (
@@ -60,24 +67,25 @@ const (
 	outDirPerm       = os.FileMode(0775)
 )
 
-func run(log *zap.Logger, cfg *config.Config, outDirectoryPath string, generateIndex bool) error { //nolint:funlen
+func (cmd *command) Run(log *zap.Logger, cfg *config.Config, outDirectoryPath string, generateIndex, disableL10n bool) error { //nolint:funlen,lll
 	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 {
+	if err := cmd.createDirectory(outDirectoryPath, outDirPerm); err != nil {
 		return errors.Wrap(err, "cannot prepare output directory")
 	}
 
-	history := newBuildingHistory()
+	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 {
+			if err := cmd.createDirectory(path.Join(outDirectoryPath, template.Name()), outDirPerm); err != nil {
 				return err
 			}
 
@@ -86,11 +94,12 @@ func run(log *zap.Logger, cfg *config.Config, outDirectoryPath string, generateI
 				filePath = path.Join(outDirectoryPath, template.Name(), fileName)
 			)
 
-			content, renderingErr := tpl.Render(template.Content(), tpl.Properties{
+			content, renderingErr := renderer.Render(template.Content(), tpl.Properties{
 				Code:               page.Code(),
 				Message:            page.Message(),
 				Description:        page.Description(),
 				ShowRequestDetails: false,
+				L10nDisabled:       disableL10n,
 			})
 			if renderingErr != nil {
 				return renderingErr
@@ -128,7 +137,7 @@ func run(log *zap.Logger, cfg *config.Config, outDirectoryPath string, generateI
 	return nil
 }
 
-func createDirectory(path string, perm os.FileMode) error {
+func (cmd *command) createDirectory(path string, perm os.FileMode) error {
 	stat, err := os.Stat(path)
 	if err != nil {
 		if os.IsNotExist(err) {

internal/cli/build/command_test.go

@@ -1,7 +1,26 @@
 package build_test
 
-import "testing"
+import (
+	"flag"
+	"testing"
 
-func TestNothing(t *testing.T) {
-	t.Skip("tests for this package have not been implemented yet")
+	"github.com/stretchr/testify/assert"
+	"github.com/urfave/cli/v2"
+	"go.uber.org/goleak"
+	"go.uber.org/zap"
+
+	"gh.tarampamp.am/error-pages/internal/cli/build"
+)
+
+func TestNewCommand(t *testing.T) {
+	defer goleak.VerifyNone(t)
+
+	cmd := build.NewCommand(zap.NewNop())
+
+	assert.NotEmpty(t, cmd.Flags)
+
+	assert.Error(t, cmd.Run(
+		cli.NewContext(cli.NewApp(), &flag.FlagSet{}, nil),
+		"",
+	), "should fail because of missing external services")
 }

internal/cli/build/index.tpl.html

@@ -1,3 +1,4 @@
+<!DOCTYPE html>
 <html lang="en">
 <head>
     <meta charset="utf-8" />
@@ -6,6 +7,11 @@
     <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">
@@ -28,7 +34,7 @@
 <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>.
+        <a href="https://gh.tarampamp.am/error-pages">project repository</a>.
     </div>
 </footer>
 </body>

internal/cli/healthcheck/command.go

@@ -2,56 +2,35 @@
 package healthcheck
 
 import (
-	"fmt"
-	"strconv"
+	"errors"
+	"math"
 
-	"github.com/spf13/cobra"
-	"github.com/spf13/pflag"
-	"github.com/tarampampam/error-pages/internal/env"
+	"github.com/urfave/cli/v2"
+
+	"gh.tarampamp.am/error-pages/internal/cli/shared"
 )
 
 type checker interface {
 	Check(port uint16) error
 }
 
-const portFlagName = "port"
-
 // NewCommand creates `healthcheck` command.
-func NewCommand(checker checker) *cobra.Command {
-	var port uint16
-
-	cmd := &cobra.Command{
-		Use:     "healthcheck",
+func NewCommand(checker checker) *cli.Command {
+	return &cli.Command{
+		Name:    "healthcheck",
 		Aliases: []string{"chk", "health", "check"},
-		Short:   "Health checker for the HTTP server. Use case - docker healthcheck",
-		PreRunE: func(c *cobra.Command, _ []string) (lastErr error) {
-			c.Flags().VisitAll(func(flag *pflag.Flag) {
-				// flag was NOT defined using CLI (flags should have maximal priority)
-				if !flag.Changed && flag.Name == portFlagName {
-					if envPort, exists := env.ListenPort.Lookup(); exists && envPort != "" {
-						if p, err := strconv.ParseUint(envPort, 10, 16); err == nil { //nolint:gomnd
-							port = uint16(p)
-						} else {
-							lastErr = fmt.Errorf("wrong TCP port environment variable [%s] value", envPort)
-						}
-					}
-				}
-			})
+		Usage:   "Health checker for the HTTP server. Use case - docker healthcheck",
+		Action: func(c *cli.Context) error {
+			var port = c.Uint(shared.ListenPortFlag.Name)
 
-			return lastErr
+			if port <= 0 || port > math.MaxUint16 {
+				return errors.New("port value out of range")
+			}
+
+			return checker.Check(uint16(port))
 		},
-		RunE: func(*cobra.Command, []string) error {
-			return checker.Check(port)
+		Flags: []cli.Flag{
+			shared.ListenPortFlag,
 		},
 	}
-
-	cmd.Flags().Uint16VarP(
-		&port,
-		portFlagName,
-		"p",
-		8080, //nolint:gomnd // must be same as default serve `--port` flag value
-		fmt.Sprintf("TCP port number [$%s]", env.ListenPort),
-	)
-
-	return cmd
 }

internal/cli/healthcheck/command_test.go

@@ -2,13 +2,13 @@ package healthcheck_test
 
 import (
 	"errors"
-	"os"
+	"flag"
 	"testing"
 
-	"github.com/kami-zh/go-capturer"
-	"github.com/spf13/cobra"
 	"github.com/stretchr/testify/assert"
-	"github.com/tarampampam/error-pages/internal/cli/healthcheck"
+	"github.com/urfave/cli/v2"
+
+	"gh.tarampamp.am/error-pages/internal/cli/healthcheck"
 )
 
 type fakeChecker struct{ err error }
@@ -18,77 +18,30 @@ func (c *fakeChecker) Check(port uint16) error { return c.err }
 func TestProperties(t *testing.T) {
 	cmd := healthcheck.NewCommand(&fakeChecker{err: nil})
 
-	assert.Equal(t, "healthcheck", cmd.Use)
+	assert.Equal(t, "healthcheck", cmd.Name)
 	assert.ElementsMatch(t, []string{"chk", "health", "check"}, cmd.Aliases)
-	assert.NotNil(t, cmd.RunE)
+	assert.NotNil(t, cmd.Action)
 }
 
 func TestCommandRun(t *testing.T) {
 	cmd := healthcheck.NewCommand(&fakeChecker{err: nil})
-	cmd.SetArgs([]string{})
 
-	output := capturer.CaptureOutput(func() {
-		assert.NoError(t, cmd.Execute())
-	})
-
-	assert.Empty(t, output)
+	assert.NoError(t, cmd.Run(cli.NewContext(cli.NewApp(), &flag.FlagSet{}, nil)))
 }
 
 func TestCommandRunFailed(t *testing.T) {
 	cmd := healthcheck.NewCommand(&fakeChecker{err: errors.New("foo err")})
-	cmd.SetArgs([]string{})
 
-	output := capturer.CaptureStderr(func() {
-		assert.Error(t, cmd.Execute())
-	})
-
-	assert.Contains(t, output, "foo err")
+	assert.ErrorContains(t, cmd.Run(cli.NewContext(cli.NewApp(), &flag.FlagSet{}, nil)), "foo err")
 }
 
 func TestPortFlagWrongArgument(t *testing.T) {
 	cmd := healthcheck.NewCommand(&fakeChecker{err: nil})
-	cmd.SetArgs([]string{"-p", "65536"}) // 65535 is max
 
-	var executed bool
+	err := cmd.Run(
+		cli.NewContext(cli.NewApp(), &flag.FlagSet{}, nil),
+		"", "-p", "65536",
+	)
 
-	cmd.RunE = func(*cobra.Command, []string) error {
-		executed = true
-
-		return nil
-	}
-
-	output := capturer.CaptureStderr(func() {
-		assert.Error(t, cmd.Execute())
-	})
-
-	assert.Contains(t, output, "invalid argument")
-	assert.Contains(t, output, "65536")
-	assert.Contains(t, output, "value out of range")
-	assert.False(t, executed)
-}
-
-func TestPortFlagWrongEnvValue(t *testing.T) {
-	cmd := healthcheck.NewCommand(&fakeChecker{err: nil})
-	cmd.SetArgs([]string{})
-
-	assert.NoError(t, os.Setenv("LISTEN_PORT", "65536")) // 65535 is max
-
-	defer func() { assert.NoError(t, os.Unsetenv("LISTEN_PORT")) }()
-
-	var executed bool
-
-	cmd.RunE = func(*cobra.Command, []string) error {
-		executed = true
-
-		return nil
-	}
-
-	output := capturer.CaptureStderr(func() {
-		assert.Error(t, cmd.Execute())
-	})
-
-	assert.Contains(t, output, "wrong TCP port")
-	assert.Contains(t, output, "environment variable")
-	assert.Contains(t, output, "65536")
-	assert.False(t, executed)
+	assert.ErrorContains(t, err, "port value out of range")
 }

internal/cli/root.go

@@ -1,93 +0,0 @@
-// Package cli contains CLI command handlers.
-package cli
-
-import (
-	"context"
-	"fmt"
-
-	"github.com/spf13/cobra"
-	"github.com/spf13/pflag"
-	"github.com/tarampampam/error-pages/internal/checkers"
-	buildCmd "github.com/tarampampam/error-pages/internal/cli/build"
-	healthcheckCmd "github.com/tarampampam/error-pages/internal/cli/healthcheck"
-	serveCmd "github.com/tarampampam/error-pages/internal/cli/serve"
-	versionCmd "github.com/tarampampam/error-pages/internal/cli/version"
-	"github.com/tarampampam/error-pages/internal/env"
-	"github.com/tarampampam/error-pages/internal/logger"
-	"github.com/tarampampam/error-pages/internal/version"
-)
-
-const configFileFlagName = "config-file"
-
-// NewCommand creates root command.
-func NewCommand(appName string) *cobra.Command { //nolint:funlen
-	var (
-		configFile string
-		verbose    bool
-		debug      bool
-		logJSON    bool
-	)
-
-	ctx := context.Background() // main CLI context
-
-	// create "default" logger (will be overwritten later with customized)
-	log, err := logger.New(false, false, false)
-	if err != nil {
-		panic(err)
-	}
-
-	cmd := &cobra.Command{
-		Use: appName,
-		PersistentPreRunE: func(c *cobra.Command, _ []string) error {
-			_ = log.Sync() // sync previous logger instance
-
-			customizedLog, e := logger.New(verbose, debug, logJSON)
-			if e != nil {
-				return e
-			}
-
-			*log = *customizedLog // override "default" logger with customized
-
-			c.Flags().VisitAll(func(flag *pflag.Flag) {
-				// flag was NOT defined using CLI (flags should have maximal priority)
-				if !flag.Changed && flag.Name == configFileFlagName {
-					if envConfigFile, exists := env.ConfigFilePath.Lookup(); exists && envConfigFile != "" {
-						configFile = envConfigFile
-					}
-				}
-			})
-
-			return nil
-		},
-		PersistentPostRun: func(*cobra.Command, []string) {
-			// error ignoring reasons:
-			// - <https://github.com/uber-go/zap/issues/772>
-			// - <https://github.com/uber-go/zap/issues/328>
-			_ = log.Sync()
-		},
-		SilenceErrors: true,
-		SilenceUsage:  true,
-		CompletionOptions: cobra.CompletionOptions{
-			DisableDefaultCmd: true,
-		},
-	}
-
-	cmd.PersistentFlags().BoolVarP(&verbose, "verbose", "v", false, "verbose output")
-	cmd.PersistentFlags().BoolVarP(&debug, "debug", "", false, "debug output")
-	cmd.PersistentFlags().BoolVarP(&logJSON, "log-json", "", false, "logs in JSON format")
-	cmd.PersistentFlags().StringVarP(
-		&configFile,
-		configFileFlagName, "c",
-		"./error-pages.yml",
-		fmt.Sprintf("path to the config file [$%s]", env.ConfigFilePath),
-	)
-
-	cmd.AddCommand(
-		versionCmd.NewCommand(version.Version()),
-		healthcheckCmd.NewCommand(checkers.NewHealthChecker(ctx)),
-		buildCmd.NewCommand(log, &configFile),
-		serveCmd.NewCommand(ctx, log, &configFile),
-	)
-
-	return cmd
-}

internal/cli/root_test.go

@@ -1,84 +0,0 @@
-package cli_test
-
-import (
-	"testing"
-
-	"github.com/spf13/cobra"
-	"github.com/stretchr/testify/assert"
-	"github.com/tarampampam/error-pages/internal/cli"
-)
-
-func TestSubcommands(t *testing.T) {
-	cmd := cli.NewCommand("unit test")
-
-	cases := []struct {
-		giveName string
-	}{
-		{giveName: "build"},
-		{giveName: "version"},
-		{giveName: "healthcheck"},
-		{giveName: "serve"},
-	}
-
-	// get all existing subcommands and put into the map
-	subcommands := make(map[string]*cobra.Command)
-	for _, sub := range cmd.Commands() {
-		subcommands[sub.Name()] = sub
-	}
-
-	for _, tt := range cases {
-		tt := tt
-		t.Run(tt.giveName, func(t *testing.T) {
-			if _, exists := subcommands[tt.giveName]; !exists {
-				assert.Failf(t, "command not found", "command [%s] was not found", tt.giveName)
-			}
-		})
-	}
-}
-
-func TestFlags(t *testing.T) {
-	cmd := cli.NewCommand("unit test")
-
-	cases := []struct {
-		giveName      string
-		wantShorthand string
-		wantDefault   string
-	}{
-		{giveName: "verbose", wantShorthand: "v", wantDefault: "false"},
-		{giveName: "debug", wantShorthand: "", wantDefault: "false"},
-		{giveName: "log-json", wantShorthand: "", wantDefault: "false"},
-		{giveName: "config-file", wantShorthand: "c", wantDefault: "./error-pages.yml"},
-	}
-
-	for _, tt := range cases {
-		tt := tt
-		t.Run(tt.giveName, func(t *testing.T) {
-			flag := cmd.Flag(tt.giveName)
-
-			if flag == nil {
-				assert.Failf(t, "flag not found", "flag [%s] was not found", tt.giveName)
-
-				return
-			}
-
-			assert.Equal(t, tt.wantShorthand, flag.Shorthand)
-			assert.Equal(t, tt.wantDefault, flag.DefValue)
-		})
-	}
-}
-
-func TestExecuting(t *testing.T) {
-	cmd := cli.NewCommand("unit test")
-	cmd.SetArgs([]string{})
-
-	var executed bool
-
-	if cmd.Run == nil { // override "Run" property for test (if it was not set)
-		cmd.Run = func(cmd *cobra.Command, args []string) {
-			executed = true
-		}
-	}
-
-	assert.NoError(t, cmd.Execute())
-	assert.True(t, executed)
-}

internal/cli/serve/command.go

@@ -3,53 +3,164 @@ package serve
 import (
 	"context"
 	"errors"
+	"fmt"
+	"net"
 	"os"
+	"strings"
 	"time"
 
-	"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"
+	"github.com/urfave/cli/v2"
 	"go.uber.org/zap"
+
+	"gh.tarampamp.am/error-pages/internal/breaker"
+	"gh.tarampamp.am/error-pages/internal/cli/shared"
+	"gh.tarampamp.am/error-pages/internal/config"
+	"gh.tarampamp.am/error-pages/internal/env"
+	appHttp "gh.tarampamp.am/error-pages/internal/http"
+	"gh.tarampamp.am/error-pages/internal/options"
+	"gh.tarampamp.am/error-pages/internal/pick"
+)
+
+type command struct {
+	c *cli.Command
+}
+
+const (
+	templateNameFlagName     = "template-name"
+	defaultErrorPageFlagName = "default-error-page"
+	defaultHTTPCodeFlagName  = "default-http-code"
+	showDetailsFlagName      = "show-details"
+	proxyHTTPHeadersFlagName = "proxy-headers"
+	disableL10nFlagName      = "disable-l10n"
+)
+
+const (
+	useRandomTemplate              = "random"
+	useRandomTemplateOnEachRequest = "i-said-random"
+	useRandomTemplateDaily         = "random-daily"
+	useRandomTemplateHourly        = "random-hourly"
 )
 
 // NewCommand creates `serve` command.
-func NewCommand(ctx context.Context, log *zap.Logger, configFile *string) *cobra.Command {
-	var (
-		f   flags
-		cfg *config.Config
-	)
+func NewCommand(log *zap.Logger) *cli.Command { //nolint:funlen
+	var cmd = command{}
 
-	cmd := &cobra.Command{
-		Use:     "serve",
+	cmd.c = &cli.Command{
+		Name:    "serve",
 		Aliases: []string{"s", "server"},
-		Short:   "Start HTTP server",
-		PreRunE: func(cmd *cobra.Command, _ []string) (err error) {
-			if configFile == nil {
+		Usage:   "Start HTTP server",
+		Action: func(c *cli.Context) error {
+			var cfg *config.Config
+
+			if configPath := c.String(shared.ConfigFileFlag.Name); configPath == "" { // load config from file
 				return errors.New("path to the config file is required for this command")
-			}
-
-			if err = f.overrideUsingEnv(cmd.Flags()); err != nil {
+			} else if loadedCfg, err := config.FromYamlFile(c.String(shared.ConfigFileFlag.Name)); err != nil {
 				return err
+			} else {
+				cfg = loadedCfg
 			}
 
-			if cfg, err = config.FromYamlFile(*configFile); err != nil {
-				return err
+			var (
+				ip   = c.String(shared.ListenAddrFlag.Name)
+				port = uint16(c.Uint(shared.ListenPortFlag.Name))
+				o    options.ErrorPage
+			)
+
+			if net.ParseIP(ip) == nil {
+				return fmt.Errorf("wrong IP address [%s] for listening", ip)
 			}
 
-			return f.validate()
+			{ // fill options
+				o.Template.Name = c.String(templateNameFlagName)
+				o.L10n.Disabled = c.Bool(disableL10nFlagName)
+				o.Default.PageCode = c.String(defaultErrorPageFlagName)
+				o.Default.HTTPCode = uint16(c.Uint(defaultHTTPCodeFlagName))
+				o.ShowDetails = c.Bool(showDetailsFlagName)
+
+				if headers := c.String(proxyHTTPHeadersFlagName); headers != "" { //nolint:nestif
+					var m = make(map[string]struct{})
+
+					// make unique and ignore empty strings
+					for _, header := range strings.Split(headers, ",") {
+						if h := strings.TrimSpace(header); h != "" {
+							if strings.ContainsRune(h, ' ') {
+								return fmt.Errorf("whitespaces in the HTTP headers for proxying [%s] are not allowed", header)
+							}
+
+							if _, ok := m[h]; !ok {
+								m[h] = struct{}{}
+							}
+						}
+					}
+
+					// convert map into slice
+					o.ProxyHTTPHeaders = make([]string, 0, len(m))
+					for h := range m {
+						o.ProxyHTTPHeaders = append(o.ProxyHTTPHeaders, h)
+					}
+				}
+			}
+
+			if o.Default.HTTPCode > 599 { //nolint:gomnd
+				return fmt.Errorf("wrong default HTTP response code [%d]", o.Default.HTTPCode)
+			}
+
+			return cmd.Run(c.Context, log, cfg, ip, port, o)
+		},
+		Flags: []cli.Flag{
+			shared.ConfigFileFlag,
+			shared.ListenPortFlag,
+			shared.ListenAddrFlag,
+			&cli.StringFlag{
+				Name:    templateNameFlagName,
+				Aliases: []string{"t"},
+				Usage: fmt.Sprintf(
+					"template name (set \"%s\" to use a randomized or \"%s\" to use a randomized template on "+
+						"each request or \"%s/%s\" daily/hourly randomized)",
+					useRandomTemplate,
+					useRandomTemplateOnEachRequest,
+					useRandomTemplateDaily,
+					useRandomTemplateHourly,
+				),
+				EnvVars: []string{env.TemplateName.String()},
+			},
+			&cli.StringFlag{
+				Name:    defaultErrorPageFlagName,
+				Value:   "404",
+				Usage:   "default error page",
+				EnvVars: []string{env.DefaultErrorPage.String()},
+			},
+			&cli.UintFlag{
+				Name:    defaultHTTPCodeFlagName,
+				Value:   404, //nolint:gomnd
+				Usage:   "default HTTP response code",
+				EnvVars: []string{env.DefaultHTTPCode.String()},
+			},
+			&cli.BoolFlag{
+				Name:    showDetailsFlagName,
+				Usage:   "show request details in response",
+				EnvVars: []string{env.ShowDetails.String()},
+			},
+			&cli.StringFlag{
+				Name:    proxyHTTPHeadersFlagName,
+				Usage:   "proxy HTTP request headers list (comma-separated)",
+				EnvVars: []string{env.ProxyHTTPHeaders.String()},
+			},
+			&cli.BoolFlag{
+				Name:    disableL10nFlagName,
+				Usage:   "disable error pages localization",
+				EnvVars: []string{env.DisableL10n.String()},
+			},
 		},
-		RunE: func(*cobra.Command, []string) error { return run(ctx, log, f, cfg) },
 	}
 
-	f.init(cmd.Flags())
-
-	return cmd
+	return cmd.c
 }
 
-// run current command.
-func run(parentCtx context.Context, log *zap.Logger, f flags, cfg *config.Config) error { //nolint:funlen
+// Run current command.
+func (cmd *command) Run( //nolint:funlen
+	parentCtx context.Context, log *zap.Logger, cfg *config.Config, ip string, port uint16, opt options.ErrorPage,
+) error {
 	var (
 		ctx, cancel = context.WithCancel(parentCtx) // serve context creation
 		oss         = breaker.NewOSSignals(ctx)     // OS signals listener
@@ -69,10 +180,10 @@ func run(parentCtx context.Context, log *zap.Logger, f flags, cfg *config.Config
 
 	var (
 		templateNames = cfg.TemplateNames()
-		picker        *pick.StringsSlice
+		picker        interface{ Pick() string }
 	)
 
-	switch f.template.name {
+	switch opt.Template.Name {
 	case useRandomTemplate:
 		log.Info("A random template will be used")
 
@@ -83,17 +194,27 @@ func run(parentCtx context.Context, log *zap.Logger, f flags, cfg *config.Config
 
 		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 {
+		if t, found := cfg.Template(opt.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)
+			return errors.New("requested nonexistent template: " + opt.Template.Name)
 		}
 	}
 
@@ -101,7 +222,7 @@ func run(parentCtx context.Context, log *zap.Logger, f flags, cfg *config.Config
 	server := appHttp.NewServer(log)
 
 	// register server routes, middlewares, etc.
-	if err := server.Register(cfg, picker, f.defaultErrorPage, f.defaultHTTPCode, f.showDetails); err != nil {
+	if err := server.Register(cfg, picker, opt); err != nil {
 		return err
 	}
 
@@ -112,14 +233,16 @@ func run(parentCtx context.Context, log *zap.Logger, f flags, cfg *config.Config
 		defer close(errCh)
 
 		log.Info("Server starting",
-			zap.String("addr", f.listen.ip),
-			zap.Uint16("port", f.listen.port),
-			zap.String("default error page", f.defaultErrorPage),
-			zap.Uint16("default HTTP response code", f.defaultHTTPCode),
-			zap.Bool("show request details", f.showDetails),
+			zap.String("addr", ip),
+			zap.Uint16("port", port),
+			zap.String("default error page", opt.Default.PageCode),
+			zap.Uint16("default HTTP response code", opt.Default.HTTPCode),
+			zap.Strings("proxy headers", opt.ProxyHTTPHeaders),
+			zap.Bool("show request details", opt.ShowDetails),
+			zap.Bool("localization disabled", opt.L10n.Disabled),
 		)
 
-		if err := server.Start(f.listen.ip, f.listen.port); err != nil {
+		if err := server.Start(ip, port); err != nil {
 			errCh <- err
 		}
 	}(startingErrCh)
@@ -132,6 +255,12 @@ func run(parentCtx context.Context, log *zap.Logger, f flags, cfg *config.Config
 	case <-ctx.Done(): // ..or context cancellation
 		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
+			}
+		}
+
 		// stop the server using created context above
 		if err := server.Stop(); err != nil {
 			return err

internal/cli/serve/flags.go

@@ -1,143 +1,220 @@
 package serve
 
-import (
-	"fmt"
-	"net"
-	"strconv"
-	"strings"
-
-	"github.com/spf13/pflag"
-	"github.com/tarampampam/error-pages/internal/env"
-)
-
-type flags struct {
-	listen struct {
-		ip   string
-		port uint16
-	}
-	template struct {
-		name string
-	}
-	defaultErrorPage string
-	defaultHTTPCode  uint16
-	showDetails      bool
-}
-
-const (
-	listenFlagName           = "listen"
-	portFlagName             = "port"
-	templateNameFlagName     = "template-name"
-	defaultErrorPageFlagName = "default-error-page"
-	defaultHTTPCodeFlagName  = "default-http-code"
-	showDetailsFlagName      = "show-details"
-)
-
-const (
-	useRandomTemplate              = "random"
-	useRandomTemplateOnEachRequest = "i-said-random"
-)
-
-func (f *flags) init(flagSet *pflag.FlagSet) {
-	flagSet.StringVarP(
-		&f.listen.ip,
-		listenFlagName, "l",
-		"0.0.0.0",
-		fmt.Sprintf("IP address to listen on [$%s]", env.ListenAddr),
-	)
-	flagSet.Uint16VarP(
-		&f.listen.port,
-		portFlagName, "p",
-		8080, //nolint:gomnd // must be same as default healthcheck `--port` flag value
-		fmt.Sprintf("TCP port number [$%s]", env.ListenPort),
-	)
-	flagSet.StringVarP(
-		&f.template.name,
-		templateNameFlagName, "t",
-		"",
-		fmt.Sprintf(
-			"template name (set \"%s\" to use a randomized or \"%s\" to use a randomized template on each request) [$%s]", //nolint:lll
-			useRandomTemplate, useRandomTemplateOnEachRequest, env.TemplateName,
-		),
-	)
-	flagSet.StringVarP(
-		&f.defaultErrorPage,
-		defaultErrorPageFlagName, "",
-		"404",
-		fmt.Sprintf("default error page [$%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),
-	)
-}
-
-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
-			switch flag.Name {
-			case listenFlagName:
-				if envVar, exists := env.ListenAddr.Lookup(); exists {
-					f.listen.ip = strings.TrimSpace(envVar)
-				}
-
-			case portFlagName:
-				if envVar, exists := env.ListenPort.Lookup(); exists {
-					if p, err := strconv.ParseUint(envVar, 10, 16); err == nil { //nolint:gomnd
-						f.listen.port = uint16(p)
-					} else {
-						lastErr = fmt.Errorf("wrong TCP port environment variable [%s] value", envVar)
-					}
-				}
-
-			case templateNameFlagName:
-				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
-					}
-				}
-			}
-		}
-	})
-
-	return lastErr
-}
-
-func (f *flags) validate() error {
-	if net.ParseIP(f.listen.ip) == nil {
-		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)
-	}
-
-	return nil
-}
+// import (
+// 	"fmt"
+// 	"net"
+// 	"sort"
+// 	"strconv"
+// 	"strings"
+//
+// 	"github.com/spf13/pflag"
+//
+// 	"gh.tarampamp.am/error-pages/internal/env"
+// 	"gh.tarampamp.am/error-pages/internal/options"
+// )
+//
+// type flags struct {
+// 	Listen struct {
+// 		IP   string
+// 		Port uint16
+// 	}
+// 	template struct {
+// 		name string
+// 	}
+// 	l10n struct {
+// 		disabled bool
+// 	}
+// 	defaultErrorPage string
+// 	defaultHTTPCode  uint16
+// 	showDetails      bool
+// 	proxyHTTPHeaders string // comma-separated
+// }
+//
+//
+//
+// func (f *flags) Init(flagSet *pflag.FlagSet) {
+// 	flagSet.StringVarP(
+// 		&f.Listen.IP,
+// 		listenFlagName, "l",
+// 		"0.0.0.0",
+// 		fmt.Sprintf("IP address to Listen on [$%s]", env.ListenAddr),
+// 	)
+// 	flagSet.Uint16VarP(
+// 		&f.Listen.Port,
+// 		portFlagName, "p",
+// 		8080, //nolint:gomnd // must be same as default healthcheck `--port` flag value
+// 		fmt.Sprintf("TCP prt number [$%s]", env.ListenPort),
+// 	)
+// 	flagSet.StringVarP(
+// 		&f.template.name,
+// 		templateNameFlagName, "t",
+// 		"",
+// 		fmt.Sprintf(
+// 			"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) [$%s]", env.ProxyHTTPHeaders),
+// 	)
+// 	flagSet.BoolVarP(
+// 		&f.l10n.disabled,
+// 		disableL10nFlagName, "",
+// 		false,
+// 		fmt.Sprintf("disable error pages localization [$%s]", env.DisableL10n),
+// 	)
+// }
+//
+// 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
+// 			switch flag.Name {
+// 			case listenFlagName:
+// 				if envVar, exists := env.ListenAddr.Lookup(); exists {
+// 					f.Listen.IP = strings.TrimSpace(envVar)
+// 				}
+//
+// 			case portFlagName:
+// 				if envVar, exists := env.ListenPort.Lookup(); exists {
+// 					if p, err := strconv.ParseUint(envVar, 10, 16); err == nil {
+// 						f.Listen.Port = uint16(p)
+// 					} else {
+// 						lastErr = fmt.Errorf("wrong TCP port environment variable [%s] value", envVar)
+// 					}
+// 				}
+//
+// 			case templateNameFlagName:
+// 				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 {
+// 						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)
+// 				}
+//
+// 			case disableL10nFlagName:
+// 				if envVar, exists := env.DisableL10n.Lookup(); exists {
+// 					if b, err := strconv.ParseBool(envVar); err == nil {
+// 						f.l10n.disabled = b
+// 					}
+// 				}
+// 			}
+// 		}
+// 	})
+//
+// 	return lastErr
+// }
+//
+// func (f *flags) Validate() error {
+// 	if net.ParseIP(f.Listen.IP) == nil {
+// 		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
+// }
+//
+// // 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
+// }
+//
+// func (f *flags) ToOptions() (o options.ErrorPage) {
+// 	o.Default.PageCode = f.defaultErrorPage
+// 	o.Default.HTTPCode = f.defaultHTTPCode
+// 	o.L10n.Disabled = f.l10n.disabled
+// 	o.Template.Name = f.template.name
+// 	o.ShowDetails = f.showDetails
+// 	o.ProxyHTTPHeaders = f.headersToProxy()
+//
+// 	return o
+// }

internal/cli/shared/flags.go

@@ -0,0 +1,31 @@
+package shared
+
+import (
+	"github.com/urfave/cli/v2"
+
+	"gh.tarampamp.am/error-pages/internal/env"
+)
+
+var ConfigFileFlag = &cli.StringFlag{ //nolint:gochecknoglobals
+	Name:    "config-file",
+	Aliases: []string{"c"},
+	Usage:   "path to the config file (yaml)",
+	Value:   "./error-pages.yml",
+	EnvVars: []string{env.ConfigFilePath.String()},
+}
+
+var ListenAddrFlag = &cli.StringFlag{ //nolint:gochecknoglobals
+	Name:    "listen",
+	Aliases: []string{"l"},
+	Usage:   "IP address to Listen on",
+	Value:   "0.0.0.0",
+	EnvVars: []string{env.ListenAddr.String()},
+}
+
+var ListenPortFlag = &cli.UintFlag{ //nolint:gochecknoglobals
+	Name:    "port",
+	Aliases: []string{"p"},
+	Usage:   "TCP port number",
+	Value:   8080, //nolint:gomnd
+	EnvVars: []string{env.ListenPort.String()},
+}

internal/cli/version/command.go

@@ -1,24 +0,0 @@
-// Package version contains CLI `version` command implementation.
-package version
-
-import (
-	"fmt"
-	"os"
-	"runtime"
-
-	"github.com/spf13/cobra"
-)
-
-// NewCommand creates `version` command.
-func NewCommand(ver string) *cobra.Command {
-	return &cobra.Command{
-		Use:     "version",
-		Aliases: []string{"v", "ver"},
-		Short:   "Display application version",
-		RunE: func(*cobra.Command, []string) (err error) {
-			_, err = fmt.Fprintf(os.Stdout, "app version:\t%s (%s)\n", ver, runtime.Version())
-
-			return
-		},
-	}
-}

internal/cli/version/command_test.go

@@ -1,30 +0,0 @@
-package version_test
-
-import (
-	"runtime"
-	"testing"
-
-	"github.com/kami-zh/go-capturer"
-	"github.com/stretchr/testify/assert"
-	"github.com/tarampampam/error-pages/internal/cli/version"
-)
-
-func TestProperties(t *testing.T) {
-	cmd := version.NewCommand("")
-
-	assert.Equal(t, "version", cmd.Use)
-	assert.ElementsMatch(t, []string{"v", "ver"}, cmd.Aliases)
-	assert.NotNil(t, cmd.RunE)
-}
-
-func TestCommandRun(t *testing.T) {
-	cmd := version.NewCommand("1.2.3@foobar")
-	cmd.SetArgs([]string{})
-
-	output := capturer.CaptureStdout(func() {
-		assert.NoError(t, cmd.Execute())
-	})
-
-	assert.Contains(t, output, "1.2.3@foobar")
-	assert.Contains(t, output, runtime.Version())
-}

internal/config/config.go

@@ -1,7 +1,6 @@
 package config
 
 import (
-	"io/ioutil"
 	"os"
 	"path"
 	"path/filepath"
@@ -68,7 +67,7 @@ func (t Template) Name() string { return t.name }
 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 {
+	if t.content, err = os.ReadFile(filePath); err != nil {
 		return errors.Wrap(err, "cannot load content for the template "+t.Name()+" from file "+filePath)
 	}
 
@@ -236,7 +235,7 @@ func FromYaml(in []byte) (_ *Config, err error) {
 
 // FromYamlFile creates new Config instance using YAML file.
 func FromYamlFile(filepath string) (*Config, error) {
-	bytes, err := ioutil.ReadFile(filepath)
+	bytes, err := os.ReadFile(filepath)
 	if err != nil {
 		return nil, errors.Wrap(err, "cannot read configuration file")
 	}

internal/config/config_test.go

@@ -5,7 +5,8 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
-	"github.com/tarampampam/error-pages/internal/config"
+
+	"gh.tarampamp.am/error-pages/internal/config"
 )
 
 func TestFromYaml(t *testing.T) {

internal/env/env.go

@@ -6,6 +6,9 @@ import "os"
 type envVariable string
 
 const (
+	LogLevel  envVariable = "LOG_LEVEL"  // logging level
+	LogFormat envVariable = "LOG_FORMAT" // logging format (json|console)
+
 	ListenAddr       envVariable = "LISTEN_ADDR"        // IP address for listening
 	ListenPort       envVariable = "LISTEN_PORT"        // port number for listening
 	TemplateName     envVariable = "TEMPLATE_NAME"      // template name
@@ -13,6 +16,8 @@ const (
 	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)
+	DisableL10n      envVariable = "DISABLE_L10N"       // disable pages localization
 )
 
 // String returns environment variable name in the string representation.

internal/env/env_test.go

@@ -15,6 +15,8 @@ func TestConstants(t *testing.T) {
 	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))
+	assert.Equal(t, "DISABLE_L10N", string(DisableL10n))
 }
 
 func TestEnvVariable_Lookup(t *testing.T) {
@@ -28,6 +30,8 @@ func TestEnvVariable_Lookup(t *testing.T) {
 		{giveEnv: DefaultErrorPage},
 		{giveEnv: DefaultHTTPCode},
 		{giveEnv: ShowDetails},
+		{giveEnv: ProxyHTTPHeaders},
+		{giveEnv: DisableL10n},
 	}
 
 	for _, tt := range cases {

internal/http/common/middlewares.go

@@ -9,17 +9,32 @@ 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),
@@ -30,6 +45,8 @@ func LogRequest(h fasthttp.RequestHandler, log *zap.Logger) fasthttp.RequestHand
 			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),
 		)
 	}
 }

internal/http/core/errorpage.go

@@ -3,9 +3,11 @@ package core
 import (
 	"strconv"
 
-	"github.com/tarampampam/error-pages/internal/config"
-	"github.com/tarampampam/error-pages/internal/tpl"
 	"github.com/valyala/fasthttp"
+
+	"gh.tarampamp.am/error-pages/internal/config"
+	"gh.tarampamp.am/error-pages/internal/options"
+	"gh.tarampamp.am/error-pages/internal/tpl"
 )
 
 type templatePicker interface {
@@ -13,13 +15,18 @@ type templatePicker interface {
 	Pick() string
 }
 
-func RespondWithErrorPage( //nolint:funlen
+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,
+	opt options.ErrorPage,
 ) {
 	ctx.Response.Header.Set("X-Robots-Tag", "noindex") // block Search indexing
 
@@ -27,16 +34,22 @@ func RespondWithErrorPage( //nolint:funlen
 		clientWant    = ClientWantFormat(ctx)
 		json, canJSON = cfg.JSONFormat()
 		xml, canXML   = cfg.XMLFormat()
-		props         = tpl.Properties{Code: pageCode, ShowRequestDetails: showRequestDetails}
+		props         = tpl.Properties{
+			Code:               pageCode,
+			ShowRequestDetails: opt.ShowDetails,
+			L10nDisabled:       opt.L10n.Disabled,
+		}
 	)
 
-	if showRequestDetails {
+	if opt.ShowDetails {
 		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 {
@@ -57,12 +70,19 @@ func RespondWithErrorPage( //nolint:funlen
 		return
 	}
 
+	// proxy required HTTP headers from the request to the response
+	for _, headerToProxy := range opt.ProxyHTTPHeaders {
+		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 := tpl.Render(json.Content(), props); err == nil {
+			if content, err := rdr.Render(json.Content(), props); err == nil {
 				ctx.SetStatusCode(httpCode)
 				_, _ = ctx.Write(content)
 			} else {
@@ -75,7 +95,7 @@ func RespondWithErrorPage( //nolint:funlen
 		{
 			SetClientFormat(ctx, XMLContentType)
 
-			if content, err := tpl.Render(xml.Content(), props); err == nil {
+			if content, err := rdr.Render(xml.Content(), props); err == nil {
 				ctx.SetStatusCode(httpCode)
 				_, _ = ctx.Write(content)
 			} else {
@@ -91,7 +111,7 @@ func RespondWithErrorPage( //nolint:funlen
 			var templateName = p.Pick()
 
 			if template, exists := cfg.Template(templateName); exists {
-				if content, err := tpl.Render(template.Content(), props); err == nil {
+				if content, err := rdr.Render(template.Content(), props); err == nil {
 					ctx.SetStatusCode(httpCode)
 					_, _ = ctx.Write(content)
 				} else {

internal/http/core/formats.go

@@ -39,7 +39,7 @@ func ClientWantFormat(ctx *fasthttp.RequestCtx) ContentType {
 				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
+					if weight, err := strconv.ParseFloat(string(b[idx+3:]), 32); err == nil {
 						f.weight = float32(weight)
 					}
 				}

internal/http/core/formats_test.go

@@ -4,8 +4,9 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
-	"github.com/tarampampam/error-pages/internal/http/core"
 	"github.com/valyala/fasthttp"
+
+	"gh.tarampamp.am/error-pages/internal/http/core"
 )
 
 func TestClientWantFormat(t *testing.T) {

internal/http/core/headers.go

@@ -24,4 +24,10 @@ const (
 
 	// 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

@@ -1,23 +1,32 @@
 package errorpage
 
 import (
-	"github.com/tarampampam/error-pages/internal/config"
-	"github.com/tarampampam/error-pages/internal/http/core"
 	"github.com/valyala/fasthttp"
+
+	"gh.tarampamp.am/error-pages/internal/config"
+	"gh.tarampamp.am/error-pages/internal/http/core"
+	"gh.tarampamp.am/error-pages/internal/options"
+	"gh.tarampamp.am/error-pages/internal/tpl"
 )
 
-type templatePicker interface {
-	// Pick the template name for responding.
-	Pick() string
-}
+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(cfg *config.Config, p templatePicker, showRequestDetails bool) fasthttp.RequestHandler {
+func NewHandler(cfg *config.Config, p templatePicker, rdr renderer, opt options.ErrorPage) fasthttp.RequestHandler {
 	return func(ctx *fasthttp.RequestCtx) {
 		core.SetClientFormat(ctx, core.PlainTextContentType) // default content type
 
 		if code, ok := ctx.UserValue("code").(string); ok {
-			core.RespondWithErrorPage(ctx, cfg, p, code, fasthttp.StatusOK, showRequestDetails)
+			core.RespondWithErrorPage(ctx, cfg, p, rdr, code, fasthttp.StatusOK, opt)
 		} else { // will never occur
 			ctx.SetStatusCode(fasthttp.StatusInternalServerError)
 			_, _ = ctx.WriteString("cannot extract requested code from the request")

internal/http/handlers/index/handler.go

@@ -3,9 +3,12 @@ package index
 import (
 	"strconv"
 
-	"github.com/tarampampam/error-pages/internal/config"
-	"github.com/tarampampam/error-pages/internal/http/core"
 	"github.com/valyala/fasthttp"
+
+	"gh.tarampamp.am/error-pages/internal/config"
+	"gh.tarampamp.am/error-pages/internal/http/core"
+	"gh.tarampamp.am/error-pages/internal/options"
+	"gh.tarampamp.am/error-pages/internal/tpl"
 )
 
 type (
@@ -13,24 +16,22 @@ type (
 		// 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,
-	defaultPageCode string,
-	defaultHTTPCode uint16,
-	showRequestDetails bool,
-) fasthttp.RequestHandler {
+func NewHandler(cfg *config.Config, p templatePicker, rdr renderer, opt options.ErrorPage) fasthttp.RequestHandler {
 	return func(ctx *fasthttp.RequestCtx) {
-		pageCode, httpCode := defaultPageCode, int(defaultHTTPCode)
+		pageCode, httpCode := opt.Default.PageCode, int(opt.Default.HTTPCode)
 
 		if returnCode, ok := extractCodeToReturn(ctx); ok {
 			pageCode, httpCode = strconv.Itoa(returnCode), returnCode
 		}
 
-		core.RespondWithErrorPage(ctx, cfg, p, pageCode, httpCode, showRequestDetails)
+		core.RespondWithErrorPage(ctx, cfg, p, rdr, pageCode, httpCode, opt)
 	}
 }
 

internal/http/server.go

@@ -5,25 +5,29 @@ import (
 	"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/version"
 	"github.com/valyala/fasthttp"
 	"go.uber.org/zap"
+
+	"gh.tarampamp.am/error-pages/internal/checkers"
+	"gh.tarampamp.am/error-pages/internal/config"
+	"gh.tarampamp.am/error-pages/internal/http/common"
+	errorpageHandler "gh.tarampamp.am/error-pages/internal/http/handlers/errorpage"
+	healthzHandler "gh.tarampamp.am/error-pages/internal/http/handlers/healthz"
+	indexHandler "gh.tarampamp.am/error-pages/internal/http/handlers/index"
+	metricsHandler "gh.tarampamp.am/error-pages/internal/http/handlers/metrics"
+	notfoundHandler "gh.tarampamp.am/error-pages/internal/http/handlers/notfound"
+	versionHandler "gh.tarampamp.am/error-pages/internal/http/handlers/version"
+	"gh.tarampamp.am/error-pages/internal/metrics"
+	"gh.tarampamp.am/error-pages/internal/options"
+	"gh.tarampamp.am/error-pages/internal/tpl"
+	"gh.tarampamp.am/error-pages/internal/version"
 )
 
 type Server struct {
 	log    *zap.Logger
 	fast   *fasthttp.Server
 	router *router.Router
+	rdr    *tpl.TemplateRenderer
 }
 
 const (
@@ -33,6 +37,8 @@ const (
 )
 
 func NewServer(log *zap.Logger) Server {
+	rdr := tpl.NewTemplateRenderer()
+
 	return Server{
 		// fasthttp docs: <https://github.com/valyala/fasthttp>
 		fast: &fasthttp.Server{
@@ -46,6 +52,7 @@ func NewServer(log *zap.Logger) Server {
 		},
 		router: router.New(),
 		log:    log,
+		rdr:    rdr,
 	}
 }
 
@@ -61,13 +68,7 @@ type templatePicker interface {
 
 // Register server routes, middlewares, etc.
 // Router docs: <https://github.com/fasthttp/router>
-func (s *Server) Register(
-	cfg *config.Config,
-	templatePicker templatePicker,
-	defaultPageCode string,
-	defaultHTTPCode uint16,
-	showDetails bool,
-) error {
+func (s *Server) Register(cfg *config.Config, templatePicker templatePicker, opt options.ErrorPage) error {
 	reg, m := metrics.NewRegistry(), metrics.NewMetrics()
 
 	if err := m.Register(reg); err != nil {
@@ -76,8 +77,9 @@ func (s *Server) Register(
 
 	s.fast.Handler = common.DurationMetrics(common.LogRequest(s.router.Handler, s.log), &m)
 
-	s.router.GET("/", indexHandler.NewHandler(cfg, templatePicker, defaultPageCode, defaultHTTPCode, showDetails))
-	s.router.GET("/{code}.html", errorpageHandler.NewHandler(cfg, templatePicker, showDetails))
+	s.router.GET("/", indexHandler.NewHandler(cfg, templatePicker, s.rdr, opt))
+	s.router.GET("/{code}.html", errorpageHandler.NewHandler(cfg, templatePicker, s.rdr, opt))
+
 	s.router.GET("/version", versionHandler.NewHandler(version.Version()))
 
 	liveHandler := healthzHandler.NewHandler(checkers.NewLiveChecker())
@@ -92,4 +94,12 @@ func (s *Server) Register(
 }
 
 // Stop server.
-func (s *Server) Stop() error { return s.fast.Shutdown() }
+func (s *Server) Stop() error {
+	if err := s.rdr.Close(); err != nil {
+		defer func() { _ = s.fast.Shutdown() }()
+
+		return err
+	}
+
+	return s.fast.Shutdown()
+}

internal/logger/format.go

@@ -0,0 +1,68 @@
+package logger
+
+import (
+	"fmt"
+	"strings"
+)
+
+// A Format is a logging format.
+type Format uint8
+
+const (
+	ConsoleFormat Format = iota // useful for console output (for humans)
+	JSONFormat                  // useful for logging aggregation systems (for robots)
+)
+
+// String returns a lower-case ASCII representation of the log format.
+func (f Format) String() string {
+	switch f {
+	case ConsoleFormat:
+		return "console"
+	case JSONFormat:
+		return "json"
+	}
+
+	return fmt.Sprintf("format(%d)", f)
+}
+
+// Formats returns a slice of all logging formats.
+func Formats() []Format {
+	return []Format{ConsoleFormat, JSONFormat}
+}
+
+// FormatStrings returns a slice of all logging formats as strings.
+func FormatStrings() []string {
+	var (
+		formats = Formats()
+		result  = make([]string, len(formats))
+	)
+
+	for i := range formats {
+		result[i] = formats[i].String()
+	}
+
+	return result
+}
+
+// ParseFormat parses a format (case is ignored) based on the ASCII representation of the log format.
+// If the provided ASCII representation is invalid an error is returned.
+//
+// This is particularly useful when dealing with text input to configure log formats.
+func ParseFormat[T string | []byte](text T) (Format, error) {
+	var format string
+
+	if s, ok := any(text).(string); ok {
+		format = s
+	} else {
+		format = string(any(text).([]byte))
+	}
+
+	switch strings.ToLower(format) {
+	case "console", "": // make the zero value useful
+		return ConsoleFormat, nil
+	case "json":
+		return JSONFormat, nil
+	}
+
+	return Format(0), fmt.Errorf("unrecognized logging format: %q", text)
+}

internal/logger/format_test.go

@@ -0,0 +1,62 @@
+package logger_test
+
+import (
+	"errors"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"gh.tarampamp.am/error-pages/internal/logger"
+)
+
+func TestFormat_String(t *testing.T) {
+	for name, tt := range map[string]struct {
+		giveFormat logger.Format
+		wantString string
+	}{
+		"json":      {giveFormat: logger.JSONFormat, wantString: "json"},
+		"console":   {giveFormat: logger.ConsoleFormat, wantString: "console"},
+		"<unknown>": {giveFormat: logger.Format(255), wantString: "format(255)"},
+	} {
+		t.Run(name, func(t *testing.T) {
+			require.Equal(t, tt.wantString, tt.giveFormat.String())
+		})
+	}
+}
+
+func TestParseFormat(t *testing.T) {
+	for name, tt := range map[string]struct {
+		giveBytes  []byte
+		giveString string
+		wantFormat logger.Format
+		wantError  error
+	}{
+		"<empty value>":          {giveBytes: []byte(""), wantFormat: logger.ConsoleFormat},
+		"<empty value> (string)": {giveString: "", wantFormat: logger.ConsoleFormat},
+		"console":                {giveBytes: []byte("console"), wantFormat: logger.ConsoleFormat},
+		"console (string)":       {giveString: "console", wantFormat: logger.ConsoleFormat},
+		"json":                   {giveBytes: []byte("json"), wantFormat: logger.JSONFormat},
+		"json (string)":          {giveString: "json", wantFormat: logger.JSONFormat},
+		"foobar":                 {giveBytes: []byte("foobar"), wantError: errors.New("unrecognized logging format: \"foobar\"")}, //nolint:lll
+	} {
+		t.Run(name, func(t *testing.T) {
+			var (
+				f   logger.Format
+				err error
+			)
+
+			if tt.giveString != "" {
+				f, err = logger.ParseFormat(tt.giveString)
+			} else {
+				f, err = logger.ParseFormat(tt.giveBytes)
+			}
+
+			if tt.wantError == nil {
+				require.NoError(t, err)
+				require.Equal(t, tt.wantFormat, f)
+			} else {
+				require.EqualError(t, err, tt.wantError.Error())
+			}
+		})
+	}
+}

internal/logger/level.go

@@ -0,0 +1,83 @@
+package logger
+
+import (
+	"fmt"
+	"strings"
+)
+
+// A Level is a logging level.
+type Level int8
+
+const (
+	DebugLevel Level = iota - 1
+	InfoLevel        // default level (zero-value)
+	WarnLevel
+	ErrorLevel
+	FatalLevel
+)
+
+// String returns a lower-case ASCII representation of the log level.
+func (l Level) String() string {
+	switch l {
+	case DebugLevel:
+		return "debug"
+	case InfoLevel:
+		return "info"
+	case WarnLevel:
+		return "warn"
+	case ErrorLevel:
+		return "error"
+	case FatalLevel:
+		return "fatal"
+	}
+
+	return fmt.Sprintf("level(%d)", l)
+}
+
+// Levels returns a slice of all logging levels.
+func Levels() []Level {
+	return []Level{DebugLevel, InfoLevel, WarnLevel, ErrorLevel, FatalLevel}
+}
+
+// LevelStrings returns a slice of all logging levels as strings.
+func LevelStrings() []string {
+	var (
+		levels = Levels()
+		result = make([]string, len(levels))
+	)
+
+	for i := range levels {
+		result[i] = levels[i].String()
+	}
+
+	return result
+}
+
+// ParseLevel parses a level (case is ignored) based on the ASCII representation of the log level.
+// If the provided ASCII representation is invalid an error is returned.
+//
+// This is particularly useful when dealing with text input to configure log levels.
+func ParseLevel[T string | []byte](text T) (Level, error) {
+	var lvl string
+
+	if s, ok := any(text).(string); ok {
+		lvl = s
+	} else {
+		lvl = string(any(text).([]byte))
+	}
+
+	switch strings.ToLower(lvl) {
+	case "debug", "verbose", "trace":
+		return DebugLevel, nil
+	case "info", "": // make the zero value useful
+		return InfoLevel, nil
+	case "warn":
+		return WarnLevel, nil
+	case "error":
+		return ErrorLevel, nil
+	case "fatal":
+		return FatalLevel, nil
+	}
+
+	return Level(0), fmt.Errorf("unrecognized logging level: %q", text)
+}

internal/logger/level_test.go

@@ -0,0 +1,84 @@
+package logger_test
+
+import (
+	"errors"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"gh.tarampamp.am/error-pages/internal/logger"
+)
+
+func TestLevel_String(t *testing.T) {
+	for name, tt := range map[string]struct {
+		giveLevel  logger.Level
+		wantString string
+	}{
+		"debug":     {giveLevel: logger.DebugLevel, wantString: "debug"},
+		"info":      {giveLevel: logger.InfoLevel, wantString: "info"},
+		"warn":      {giveLevel: logger.WarnLevel, wantString: "warn"},
+		"error":     {giveLevel: logger.ErrorLevel, wantString: "error"},
+		"fatal":     {giveLevel: logger.FatalLevel, wantString: "fatal"},
+		"<unknown>": {giveLevel: logger.Level(127), wantString: "level(127)"},
+	} {
+		t.Run(name, func(t *testing.T) {
+			require.Equal(t, tt.wantString, tt.giveLevel.String())
+		})
+	}
+}
+
+func TestParseLevel(t *testing.T) {
+	for name, tt := range map[string]struct {
+		giveBytes  []byte
+		giveString string
+		wantLevel  logger.Level
+		wantError  error
+	}{
+		"<empty value>":          {giveBytes: []byte(""), wantLevel: logger.InfoLevel},
+		"<empty value> (string)": {giveString: "", wantLevel: logger.InfoLevel},
+		"trace":                  {giveBytes: []byte("debug"), wantLevel: logger.DebugLevel},
+		"verbose":                {giveBytes: []byte("debug"), wantLevel: logger.DebugLevel},
+		"debug":                  {giveBytes: []byte("debug"), wantLevel: logger.DebugLevel},
+		"debug (string)":         {giveString: "debug", wantLevel: logger.DebugLevel},
+		"info":                   {giveBytes: []byte("info"), wantLevel: logger.InfoLevel},
+		"warn":                   {giveBytes: []byte("warn"), wantLevel: logger.WarnLevel},
+		"error":                  {giveBytes: []byte("error"), wantLevel: logger.ErrorLevel},
+		"fatal":                  {giveBytes: []byte("fatal"), wantLevel: logger.FatalLevel},
+		"fatal (string)":         {giveString: "fatal", wantLevel: logger.FatalLevel},
+		"foobar":                 {giveBytes: []byte("foobar"), wantError: errors.New("unrecognized logging level: \"foobar\"")}, //nolint:lll
+	} {
+		t.Run(name, func(t *testing.T) {
+			var (
+				l   logger.Level
+				err error
+			)
+
+			if tt.giveString != "" {
+				l, err = logger.ParseLevel(tt.giveString)
+			} else {
+				l, err = logger.ParseLevel(tt.giveBytes)
+			}
+
+			if tt.wantError == nil {
+				require.NoError(t, err)
+				require.Equal(t, tt.wantLevel, l)
+			} else {
+				require.EqualError(t, err, tt.wantError.Error())
+			}
+		})
+	}
+}
+
+func TestLevels(t *testing.T) {
+	require.Equal(t, []logger.Level{
+		logger.DebugLevel,
+		logger.InfoLevel,
+		logger.WarnLevel,
+		logger.ErrorLevel,
+		logger.FatalLevel,
+	}, logger.Levels())
+}
+
+func TestLevelStrings(t *testing.T) {
+	require.Equal(t, []string{"debug", "info", "warn", "error", "fatal"}, logger.LevelStrings())
+}

internal/logger/logger.go

@@ -2,20 +2,27 @@
 package logger
 
 import (
+	"errors"
+
 	"go.uber.org/zap"
 	"go.uber.org/zap/zapcore"
 )
 
-// New creates new "zap" logger with little customization.
-func New(verbose, debug, logJSON bool) (*zap.Logger, error) {
+// New creates new "zap" logger with a small customization.
+func New(l Level, f Format) (*zap.Logger, error) {
 	var config zap.Config
 
-	if logJSON {
-		config = zap.NewProductionConfig()
-	} else {
+	switch f {
+	case ConsoleFormat:
 		config = zap.NewDevelopmentConfig()
 		config.EncoderConfig.EncodeLevel = zapcore.LowercaseColorLevelEncoder
 		config.EncoderConfig.EncodeTime = zapcore.TimeEncoderOfLayout("15:04:05")
+
+	case JSONFormat:
+		config = zap.NewProductionConfig() // json encoder is used by default
+
+	default:
+		return nil, errors.New("unsupported logging format")
 	}
 
 	// default configuration for all encoders
@@ -24,15 +31,31 @@ func New(verbose, debug, logJSON bool) (*zap.Logger, error) {
 	config.DisableStacktrace = true
 	config.DisableCaller = true
 
-	if debug {
+	// enable additional features for debugging
+	if l <= DebugLevel {
 		config.Development = true
 		config.DisableStacktrace = false
 		config.DisableCaller = false
 	}
 
-	if verbose || debug {
-		config.Level = zap.NewAtomicLevelAt(zap.DebugLevel)
+	var zapLvl zapcore.Level
+
+	switch l { // convert level to zap.Level
+	case DebugLevel:
+		zapLvl = zap.DebugLevel
+	case InfoLevel:
+		zapLvl = zap.InfoLevel
+	case WarnLevel:
+		zapLvl = zap.WarnLevel
+	case ErrorLevel:
+		zapLvl = zap.ErrorLevel
+	case FatalLevel:
+		zapLvl = zap.FatalLevel
+	default:
+		return nil, errors.New("unsupported logging level")
 	}
 
+	config.Level = zap.NewAtomicLevelAt(zapLvl)
+
 	return config.Build()
 }

internal/logger/logger_test.go

@@ -8,64 +8,51 @@ import (
 
 	"github.com/kami-zh/go-capturer"
 	"github.com/stretchr/testify/assert"
-	"github.com/tarampampam/error-pages/internal/logger"
+	"github.com/stretchr/testify/require"
+
+	"gh.tarampamp.am/error-pages/internal/logger"
 )
 
-func TestNewNotVerboseDebugJSON(t *testing.T) {
+func TestNewDebugLevelConsoleFormat(t *testing.T) {
 	output := capturer.CaptureStderr(func() {
-		log, err := logger.New(false, false, false)
-		assert.NoError(t, err)
+		log, err := logger.New(logger.DebugLevel, logger.ConsoleFormat)
+		require.NoError(t, err)
 
-		log.Info("inf msg")
 		log.Debug("dbg msg")
+		log.Info("inf msg")
 		log.Error("err msg")
 	})
 
 	assert.Contains(t, output, time.Now().Format("15:04:05"))
 	assert.Regexp(t, `\t.+info.+\tinf msg`, output)
-	assert.NotContains(t, output, "dbg msg")
-	assert.Contains(t, output, "err msg")
-}
-
-func TestNewVerboseNotDebugJSON(t *testing.T) {
-	output := capturer.CaptureStderr(func() {
-		log, err := logger.New(true, false, false)
-		assert.NoError(t, err)
-
-		log.Info("inf msg")
-		log.Debug("dbg msg")
-		log.Error("err msg")
-	})
-
-	assert.Contains(t, output, time.Now().Format("15:04:05"))
-	assert.Regexp(t, `\t.+info.+\tinf msg`, output)
-	assert.Contains(t, output, "dbg msg")
-	assert.Contains(t, output, "err msg")
-}
-
-func TestNewVerboseDebugNotJSON(t *testing.T) {
-	output := capturer.CaptureStderr(func() {
-		log, err := logger.New(true, true, false)
-		assert.NoError(t, err)
-
-		log.Info("inf msg")
-		log.Debug("dbg msg")
-		log.Error("err msg")
-	})
-
-	assert.Contains(t, output, time.Now().Format("15:04:05"))
 	assert.Regexp(t, `\t.+info.+\t.+logger_test\.go:\d+\tinf msg`, output)
 	assert.Contains(t, output, "dbg msg")
 	assert.Contains(t, output, "err msg")
 }
 
-func TestNewNotVerboseDebugButJSON(t *testing.T) {
+func TestNewErrorLevelConsoleFormat(t *testing.T) {
 	output := capturer.CaptureStderr(func() {
-		log, err := logger.New(false, false, true)
-		assert.NoError(t, err)
+		log, err := logger.New(logger.ErrorLevel, logger.ConsoleFormat)
+		require.NoError(t, err)
 
-		log.Info("inf msg")
 		log.Debug("dbg msg")
+		log.Info("inf msg")
+		log.Error("err msg")
+	})
+
+	assert.NotContains(t, output, "inf msg")
+	assert.NotContains(t, output, "dbg msg")
+	assert.Contains(t, output, "err msg")
+}
+
+func TestNewWarnLevelJSONFormat(t *testing.T) {
+	output := capturer.CaptureStderr(func() {
+		log, err := logger.New(logger.WarnLevel, logger.JSONFormat)
+		require.NoError(t, err)
+
+		log.Debug("dbg msg")
+		log.Info("inf msg")
+		log.Warn("warn msg")
 		log.Error("err msg")
 	})
 
@@ -75,6 +62,14 @@ func TestNewNotVerboseDebugButJSON(t *testing.T) {
 
 	lines := strings.Split(strings.Trim(output, "\n"), "\n")
 
-	assert.JSONEq(t, `{"level":"info","ts":0.1,"msg":"inf msg"}`, lines[0])
+	assert.JSONEq(t, `{"level":"warn","ts":0.1,"msg":"warn msg"}`, lines[0])
 	assert.JSONEq(t, `{"level":"error","ts":0.1,"msg":"err msg"}`, lines[1])
 }
+
+func TestNewErrors(t *testing.T) {
+	_, err := logger.New(logger.Level(127), logger.ConsoleFormat)
+	require.EqualError(t, err, "unsupported logging level")
+
+	_, err = logger.New(logger.WarnLevel, logger.Format(255))
+	require.EqualError(t, err, "unsupported logging format")
+}

internal/metrics/metrics_test.go

@@ -8,7 +8,8 @@ import (
 	"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"
+
+	"gh.tarampamp.am/error-pages/internal/metrics"
 )
 
 func TestMetrics_Register(t *testing.T) {

internal/metrics/registry_test.go

@@ -5,7 +5,8 @@ import (
 
 	"github.com/prometheus/client_golang/prometheus/testutil"
 	"github.com/stretchr/testify/assert"
-	"github.com/tarampampam/error-pages/internal/metrics"
+
+	"gh.tarampamp.am/error-pages/internal/metrics"
 )
 
 func TestNewRegistry(t *testing.T) {

internal/options/errorpage.go

@@ -0,0 +1,16 @@
+package options
+
+type ErrorPage struct {
+	Default struct {
+		PageCode string // default error page code
+		HTTPCode uint16 // default HTTP response code
+	}
+	L10n struct {
+		Disabled bool // disable error pages localization
+	}
+	Template struct {
+		Name string // template name
+	}
+	ShowDetails      bool     // show request details in response
+	ProxyHTTPHeaders []string // proxy HTTP request headers list
+}

internal/pick/picker.go

@@ -51,33 +51,38 @@ func (p *picker) NextIndex() uint32 {
 
 	case RandomOnce:
 		if p.lastIdx == unsetIdx {
-			p.mu.Lock()
-			defer p.mu.Unlock()
-
-			p.lastIdx = uint32(p.rand.Intn(int(p.maxIdx)))
+			return p.randomizeNext()
 		}
 
 		return p.lastIdx
 
 	case RandomEveryTime:
-		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
-		}
-
-		return p.lastIdx
+		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

@@ -4,7 +4,8 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
-	"github.com/tarampampam/error-pages/internal/pick"
+
+	"gh.tarampamp.am/error-pages/internal/pick"
 )
 
 func TestPicker_NextIndex_First(t *testing.T) {

internal/pick/strings_slice.go

@@ -1,5 +1,11 @@
 package pick
 
+import (
+	"errors"
+	"sync"
+	"time"
+)
+
 type StringsSlice struct {
 	s []string
 	p *picker
@@ -7,7 +13,13 @@ type StringsSlice struct {
 
 // NewStringsSlice creates new StringsSlice.
 func NewStringsSlice(items []string, mode pickMode) *StringsSlice {
-	return &StringsSlice{s: items, p: NewPicker(uint32(len(items)-1), mode)}
+	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.
@@ -18,3 +30,106 @@ func (s *StringsSlice) Pick() string {
 
 	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

@@ -2,9 +2,11 @@ package pick_test
 
 import (
 	"testing"
+	"time"
 
 	"github.com/stretchr/testify/assert"
-	"github.com/tarampampam/error-pages/internal/pick"
+
+	"gh.tarampamp.am/error-pages/internal/pick"
 )
 
 func TestStringsSlice_Pick(t *testing.T) {
@@ -47,3 +49,83 @@ func TestStringsSlice_Pick(t *testing.T) {
 		}
 	})
 }
+
+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/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 +1,36 @@
+package tpl_test
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"gh.tarampamp.am/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

@@ -1,6 +1,8 @@
 package tpl
 
-import "reflect"
+import (
+	"reflect"
+)
 
 type Properties struct { // only string properties with a "token" tag, please
 	Code               string `token:"code"`
@@ -12,6 +14,9 @@ type Properties struct { // only string properties with a "token" tag, please
 	ServiceName        string `token:"service_name"`
 	ServicePort        string `token:"service_port"`
 	RequestID          string `token:"request_id"`
+	ForwardedFor       string `token:"forwarded_for"`
+	Host               string `token:"host"`
+	L10nDisabled       bool
 	ShowRequestDetails bool
 }
 
@@ -31,3 +36,5 @@ func (p *Properties) Replaces() map[string]string {
 
 	return replaces
 }
+
+func (p *Properties) Hash() (Hash, error) { return HashStruct(p) }

internal/tpl/properties_test.go

@@ -4,20 +4,23 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
-	"github.com/tarampampam/error-pages/internal/tpl"
+
+	"gh.tarampamp.am/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",
+		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()
@@ -31,6 +34,8 @@ func TestProperties_Replaces(t *testing.T) {
 	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 = "", "", ""
 
@@ -40,3 +45,23 @@ func TestProperties_Replaces(t *testing.T) {
 	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

@@ -5,13 +5,17 @@ import (
 	"encoding/json"
 	"os"
 	"strconv"
+	"sync"
 	"text/template"
 	"time"
 
-	"github.com/tarampampam/error-pages/internal/version"
+	"github.com/pkg/errors"
+
+	"gh.tarampamp.am/error-pages/internal/version"
 )
 
-var tplFnMap = template.FuncMap{ //nolint:gochecknoglobals // these functions can be used in templates
+// 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
@@ -27,16 +31,121 @@ var tplFnMap = template.FuncMap{ //nolint:gochecknoglobals // these functions ca
 
 		return 0
 	},
+	"env": os.Getenv,
 }
 
-func Render(content []byte, props Properties) ([]byte, error) {
+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 },
+		"show_details":  func() bool { return props.ShowRequestDetails },
+		"hide_details":  func() bool { return !props.ShowRequestDetails },
+		"l10n_disabled": func() bool { return props.L10nDisabled },
+		"l10n_enabled":  func() bool { return !props.L10nDisabled },
 	}
 
 	// make a copy of template functions map
@@ -62,5 +171,50 @@ func Render(content []byte, props Properties) ([]byte, error) {
 		return nil, err
 	}
 
-	return buf.Bytes(), nil
+	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++ { //nolint:gosimple
+		result[i] = a[i]
+	}
+
+	for i := 0; i < len(b); i++ {
+		result[i+len(a)] = b[i]
+	}
+
+	return
 }

internal/tpl/render_test.go

@@ -1,13 +1,26 @@
 package tpl_test
 
 import (
+	"math/rand"
+	"os"
+	"strconv"
+	"sync"
 	"testing"
 
 	"github.com/stretchr/testify/assert"
-	"github.com/tarampampam/error-pages/internal/tpl"
+	"github.com/stretchr/testify/require"
+
+	"gh.tarampamp.am/error-pages/internal/tpl"
 )
 
 func Test_Render(t *testing.T) {
+	renderer := tpl.NewTemplateRenderer()
+	defer func() { _ = renderer.Close() }()
+
+	require.NoError(t, os.Setenv("TEST_ENV_VAR", "unit-test"))
+
+	defer func() { require.NoError(t, os.Unsetenv("TEST_ENV_VAR")) }()
+
 	for name, tt := range map[string]struct {
 		giveContent string
 		giveProps   tpl.Properties
@@ -50,9 +63,25 @@ func Test_Render(t *testing.T) {
 			giveProps:   tpl.Properties{Code: "201", Message: "lorem ipsum"},
 			wantContent: `{"code": "201", "message": {"here":[ " Yeah " ]}}`,
 		},
+
+		"fn l10n_enabled": {
+			giveContent: "{{ if l10n_enabled }}Y{{ else }}N{{ end }}",
+			giveProps:   tpl.Properties{L10nDisabled: true},
+			wantContent: "N",
+		},
+		"fn l10n_disabled": {
+			giveContent: "{{ if l10n_disabled }}Y{{ else }}N{{ end }}",
+			giveProps:   tpl.Properties{L10nDisabled: true},
+			wantContent: "Y",
+		},
+
+		"env": {
+			giveContent: `{{ env "TEST_ENV_VAR" }}`,
+			wantContent: "unit-test",
+		},
 	} {
 		t.Run(name, func(t *testing.T) {
-			content, err := tpl.Render([]byte(tt.giveContent), tt.giveProps)
+			content, err := renderer.Render([]byte(tt.giveContent), tt.giveProps)
 
 			if tt.wantError == true {
 				assert.Error(t, err)
@@ -64,11 +93,48 @@ func Test_Render(t *testing.T) {
 	}
 }
 
+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++ {
-		_, _ = tpl.Render(
+		_, _ = renderer.Render(
 			[]byte("{{code}}: {{ message }} {{description}}"),
 			tpl.Properties{Code: "404", Message: "Not found", Description: "Blah"},
 		)

l10n/.eslintrc.json

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

l10n/l10n.js

@@ -0,0 +1,799 @@
+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',
+                pt: 'Erro',
+                nl: 'Fout',
+                de: 'Fehler',
+                es: 'Error',
+                zh: '错误',
+            },
+            'Good luck': {
+                fr: 'Bonne chance',
+                ru: 'Удачи',
+                uk: 'Успіхів',
+                pt: 'Boa sorte',
+                nl: 'Veel succes',
+                de: 'Viel Glück',
+                es: 'Buena Suerte',
+                zh: '祝好运',
+            },
+            'UH OH': {
+                fr: 'Oups',
+                ru: 'Ох',
+                uk: 'Ох',
+                pt: 'Ops',
+                nl: 'Oeps',
+                de: 'Hoppla',
+                es: 'Oups',
+                zh: '哎呀',
+            },
+            'Request details': {
+                fr: 'Détails de la requête',
+                ru: 'Детали запроса',
+                uk: 'Деталі запиту',
+                pt: 'Detalhes da solicitação',
+                nl: 'Details van verzoek',
+                de: 'Details der Anfrage',
+                es: 'Detalles de la petición',
+                zh: '请求详情',
+            },
+            'Double-check the URL': {
+                fr: 'Vérifiez l’URL',
+                ru: 'Дважды проверьте URL',
+                uk: 'Двічі перевіряйте URL-адресу',
+                pt: 'Verifique novamente a URL',
+                nl: 'Controleer de URL',
+                de: 'Überprüfen Sie die URL',
+                es: 'Verifique la url',
+                zh: '请再次检查地址',
+            },
+            'Alternatively, go back': {
+                fr: 'Essayer de revenir en arrière',
+                ru: 'Или можете вернуться назад',
+                uk: 'Або ви можете повернутися',
+                pt: "Como alternativa, tente voltar",
+                nl: 'Of ga terug',
+                de: 'Alternativ gehen Sie zurück',
+                es: 'Como alternativa, vuelva atrás',
+                zh: '或返回上一页',
+            },
+            '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',
+                pt: 'Aqui está o que pode ter acontecido',
+                nl: 'Wat er gebeurd kan zijn',
+                de: 'Folgendes könnte passiert sein',
+                es: 'Esto es lo que ha podido pasar',
+                zh: '可能原因有',
+            },
+            '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',
+                pt: 'Você pode ter digitado incorretamente a URL',
+                nl: 'De URL bevat een typefout',
+                de: 'Möglicherweise haben Sie die URL falsch eingegeben',
+                es: 'Igual ha escrito mal la URL',
+                zh: '您可能输入了错误的地址',
+            },
+            'The site was moved': {
+                fr: 'Le site a été déplacé',
+                ru: 'Сайт был перемещён',
+                uk: 'Сайт був переміщений',
+                pt: 'O site foi movido',
+                nl: 'De site is verplaatst',
+                de: 'Die Seite wurde verschoben',
+                es: 'El sitio se ha movido',
+                zh: '站点已被转移',
+            },
+            'It was never here': {
+                fr: 'Il n’a jamais été ici',
+                ru: 'Он никогда не был здесь',
+                uk: 'Він ніколи не був тут',
+                pt: 'Nunca esteve aqui',
+                nl: 'Het was hier nooit',
+                de: 'Es war nie hier',
+                es: 'Nunca ha estado aquí',
+                zh: '站点从未存在',
+            },
+            'Bad Request': {
+                fr: 'Mauvaise requête',
+                ru: 'Некорректный запрос',
+                uk: 'Неправильний запит',
+                pt: 'Requisição inválida',
+                nl: 'Foutieve anvraag',
+                de: 'Fehlerhafte Anfrage',
+                es: 'Petición inválida',
+                zh: '错误请求',
+            },
+            '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',
+                pt: 'O servidor não entendeu a solicitação',
+                nl: 'De server begreep het verzoek niet',
+                de: 'Der Server hat die Anfrage nicht verstanden',
+                es: 'El servidor no entendió la petición',
+                zh: '服务器不理解该请求',
+            },
+            'Unauthorized': {
+                fr: 'Non autorisé',
+                ru: 'Запрос не авторизован',
+                uk: 'Несанкціонований доступ',
+                pt: 'Não autorizado',
+                nl: 'Niet geautoriseerd',
+                de: 'Nicht autorisiert',
+                es: 'No autorizado',
+                zh: '未经授权',
+            },
+            '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',
+                pt: 'A página solicitada precisa de um nome de usuário e uma senha',
+                nl: 'De pagina heeft een gebruikersnaam en wachtwoord nodig',
+                de: 'Die angeforderte Seite benötigt einen Benutzernamen und ein Passwort',
+                es: 'La página solicitada necesita un usuario y una contraseña',
+                zh: '请求的页面需要用户名和密码',
+            },
+            'Forbidden': {
+                fr: 'Interdit',
+                ru: 'Запрещено',
+                uk: 'Заборонено',
+                pt: 'Proibido',
+                nl: 'Verboden',
+                de: 'Verboten',
+                es: 'Prohibido',
+                zh: '禁止访问',
+            },
+            'Access is forbidden to the requested page': {
+                fr: 'Accès interdit à la page demandée',
+                ru: 'Доступ к странице запрещён',
+                uk: 'Доступ до сторінки заборонено',
+                pt: 'É proibido o acesso à página solicitada',
+                nl: 'Toegang tot de pagina is verboden',
+                de: 'Der Zugriff auf die angeforderte Seite ist verboten',
+                es: 'El acceso está prohibido para la página solicitada',
+                zh: '禁止访问请求的页面',
+            },
+            'Not Found': {
+                fr: 'Introuvable',
+                ru: 'Страница не найдена',
+                uk: 'Сторінка не знайдена',
+                pt: 'Não encontrado',
+                nl: 'Niet gevonden',
+                de: 'Nicht gefunden',
+                es: 'No encontrado',
+                zh: '未找到',
+            },
+            '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',
+                pt: 'O servidor não consegue encontrar a página solicitada',
+                nl: 'De server kan de pagina niet vinden',
+                de: 'Der Server kann die angeforderte Seite nicht finden',
+                es: 'El servidor no puede encontrar la página solicitada',
+                zh: '服务器找不到请求的页面',
+            },
+            'Method Not Allowed': {
+                fr: 'Méthode Non Autorisée',
+                ru: 'Метод не поддерживается',
+                uk: 'Неприпустимий метод',
+                pt: 'Método não permitido',
+                nl: 'Methode niet toegestaan',
+                de: 'Methode nicht erlaubt',
+                es: 'Método no permitido',
+                zh: '方法不被允许',
+            },
+            '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',
+                pt: 'O método especificado na solicitação não é permitido',
+                nl: 'De methode in het verzoek is niet toegestaan',
+                de: 'Die in der Anfrage angegebene Methode ist nicht zulässig',
+                es: 'El método especificado en la petición no está permitido',
+                zh: '请求指定的方法不被允许',
+            },
+            'Proxy Authentication Required': {
+                fr: 'Authentification proxy requise',
+                ru: 'Нужна аутентификация прокси',
+                uk: 'Потрібна ідентифікація проксі',
+                pt: 'Autenticação de proxy necessária',
+                nl: 'Authenticatie op de proxyserver verplicht',
+                de: 'Proxy-Authentifizierung benötigt',
+                es: 'Autenticación de proxy requerida',
+                zh: '需要代理服务器身份验证',
+            },
+            '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',
+                pt: 'Você deve se autenticar com um servidor proxy antes que esta solicitação possa ser atendida',
+                nl: 'Je moet authenticeren bij een proxyserver voordat dit verzoek uitgevoerd kan worden',
+                de: 'Sie müssen sich bei einem Proxy-Server authentifizieren, bevor diese Anfrage bedient werden kann',
+                es: 'Debes autentificarte con un servidor proxy antes de que esta petición pueda ser atendida',
+                zh: '您必须对代理服务器进行身份验证，然后才能让请求得到处理',
+            },
+            'Request Timeout': {
+                fr: 'Requête expiré',
+                ru: 'Истекло время ожидания',
+                uk: 'Час запиту закінчився',
+                pt: 'Tempo limite de solicitação excedido',
+                nl: 'Aanvraagtijd verstreken',
+                de: 'Zeitüberschreitung der Anforderung',
+                es: 'Tiempo límite de la petición excedido',
+                zh: '请求超时',
+            },
+            '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',
+                pt: 'A solicitação demorou mais do que o servidor estava preparado para esperar',
+                nl: 'Het verzoek duurde langer dan de server wilde wachten',
+                de: 'Die Anfrage hat länger gedauert, als der Server bereit war zu warten',
+                es: 'La petición esta tardando más de lo que el servidor estaba preparado para esperar',
+                zh: '请求用时超过了服务器设置的最长等待时间',
+            },
+            'Conflict': {
+                fr: 'Conflit',
+                ru: 'Конфликт',
+                uk: 'Конфлікт',
+                pt: 'Conflito',
+                nl: 'Conflict',
+                de: 'Konflikt',
+                es: 'Conflicto',
+                zh: '冲突',
+            },
+            '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',
+                pt: 'A solicitação não pôde ser concluída devido a um conflito',
+                nl: 'Het verzoek kon niet worden verwerkt vanwege een conflict',
+                de: 'Die Anfrage konnte aufgrund eines Konflikts nicht abgeschlossen werden',
+                es: 'La petición no ha podido ser completada por un conflicto',
+                zh: '由于冲突，请求无法完成',
+            },
+            'Gone': {
+                fr: 'Supprimé',
+                ru: 'Удалено',
+                uk: 'Вилучений',
+                pt: 'Removido',
+                nl: 'Verdwenen',
+                de: 'Verschwunden',
+                es: 'Eliminado',
+                zh: '已移除',
+            },
+            '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',
+                pt: 'A página solicitada não está mais disponível',
+                nl: 'De pagina is niet langer beschikbaar',
+                de: 'Die angeforderte Seite ist nicht mehr verfügbar',
+                es: 'La página solicitada no está ya disponible',
+                zh: '请求的页面不再可用',
+            },
+            'Length Required': {
+                fr: 'Longueur requise',
+                ru: 'Необходима длина',
+                uk: 'Потрібно вказати розмір',
+                pt: 'Content-Length necessário',
+                nl: 'Lengte benodigd',
+                de: 'Länge benötigt',
+                es: 'Longitud requerida',
+                zh: '需要长度',
+            },
+            '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',
+                pt: 'O "Content-Length" não está definido. O servidor não aceitará a solicitação sem ele',
+                nl: 'De "Content-Length" is niet gespecificeerd. De server accepteert het verzoek niet zonder',
+                de: 'Die "Content-Length" ist nicht definiert. Ohne sie akzeptiert der Server die Anfrage nicht',
+                es: 'El "Content-Legth" no eta definido. Este servidor no aceptará la petición sin él',
+                zh: '未指定Content-Length(内容长度)。服务器将不接受不包含此头信息的请求',
+            },
+            'Precondition Failed': {
+                fr: 'Échec de la condition préalable',
+                ru: 'Условие ложно',
+                uk: 'Збій під час обробки попередньої умови',
+                pt: 'Falha na pré-condição',
+                nl: 'Niet voldaan aan vooraf gestelde voorwaarde',
+                de: 'Vorbedingung fehlgeschlagen',
+                es: 'Precondición fallida',
+                zh: '前置条件判定失败',
+            },
+            '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',
+                pt: 'A pré-condição dada na solicitação avaliada como falsa pelo servidor',
+                nl: 'De vooraf gestelde voorwaarde is afgewezen door de server',
+                de: 'Die in der Anfrage angegebene Vorbedingung wird vom Server als falsch bewertet',
+                es: 'La precondición ha sido evaluada como negativa para esta petición por el servidor',
+                zh: '服务器评估请求中给出的前置条件的结果为false(假)',
+            },
+            'Payload Too Large': {
+                fr: 'Charge trop volumineuse',
+                ru: 'Слишком большой запрос',
+                uk: 'Занадто великий запит',
+                pt: 'Payload muito grande',
+                nl: 'Aanvraag te grood',
+                de: 'Anfrage zu groß',
+                es: 'Carga muy grande',
+                zh: '请求体过大',
+            },
+            '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',
+                pt: 'O servidor não aceitará a solicitação porque a entidade da solicitação é muito grande',
+                nl: 'De server accepteert het verzoek niet omdat de aanvraag te groot is',
+                de: 'Der Server akzeptiert die Anfrage nicht, da die Datenmenge zu groß ist',
+                es: 'El servidor no aceptará esta petición, porque la carga es demasiado grande',
+                zh: '请求体过大，服务器将不接受该请求',
+            },
+            'Requested Range Not Satisfiable': {
+                fr: 'Requête non satisfaisante',
+                ru: 'Диапазон не достижим',
+                uk: 'Запитуваний діапазон недосяжний',
+                pt: 'Intervalo Solicitado Não Satisfatório',
+                nl: 'Aangevraagd gedeelte niet opvraagbaar',
+                de: 'Anfrage-Bereich nicht erfüllbar',
+                es: 'Intervalo solicitado no satisfactorio',
+                zh: '不满足请求范围',
+            },
+            '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',
+                pt: 'O intervalo de bytes solicitado não está disponível e está fora dos limites',
+                nl: 'De aangevraagde bytes zijn buiten het limiet',
+                de: 'Der angefragte Teilbereich der Ressource existiert nicht oder ist ungültig',
+                es: 'El intervalo de bytes requerido no está disponible o se encuentra fuera de los límites',
+                zh: '请求的字节范围不可用，超出边界',
+            },
+            'I\'m a teapot': {
+                fr: 'Je suis une théière',
+                ru: 'Я чайник',
+                uk: 'Я чайник',
+                pt: 'Eu sou um bule',
+                nl: 'Ik ben een theepot',
+                de: 'Ich bin eine Teekanne',
+                es: 'Soy una tetera',
+                zh: '我是一只茶壶',
+            },
+            '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',
+                pt: 'A tentativa de preparar café com um bule não é suportada',
+                nl: 'Koffie maken met een theepot is niet ondersteund',
+                de: 'Der Versuch, Kaffee mit einer Teekanne zuzubereiten, wird nicht unterstützt',
+                es: 'Intentar hacer un café en una tetera no está soportado',
+                zh: '用茶壶泡咖啡不受支持',
+            },
+            'Too Many Requests': {
+                fr: 'Trop de requêtes',
+                ru: 'Слишком много запросов',
+                uk: 'Занадто багато запитів',
+                pt: 'Excesso de solicitações',
+                nl: 'Te veel requests',
+                de: 'Zu viele Anfragen',
+                es: 'Demasiadas peticiones',
+                zh: '请求过多',
+            },
+            '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',
+                pt: 'Excesso de solicitações em um determinado período de tempo',
+                nl: 'Te veel verzoeken binnen een bepaalde tijd',
+                de: 'Der Client hat zu viele Anfragen in einem bestimmten Zeitraum gesendet',
+                es: 'Demasiadas peticiones en un determinado periodo de tiempo',
+                zh: '在给定的时间内发送了过多请求',
+            },
+            'Internal Server Error': {
+                fr: 'Erreur interne du serveur',
+                ru: 'Внутренняя ошибка сервера',
+                uk: 'Внутрішня помилка сервера',
+                pt: 'Erro do Servidor Interno',
+                nl: 'Interne serverfout',
+                de: 'Interner Server-Fehler',
+                es: 'Error Interno',
+                zh: '内部服务器错误',
+            },
+            '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',
+                pt: 'O servidor encontrou uma condição inesperada',
+                nl: 'De server ondervond een onverwachte conditie',
+                de: 'Der Server hat einen internen Fehler festgestellt',
+                es: 'El servidor ha encontrado una condición no esperada',
+                zh: '服务器遇到了意外情况',
+            },
+            'Bad Gateway': {
+                fr: 'Mauvaise passerelle',
+                ru: 'Ошибка шлюза',
+                uk: 'Помилка шлюзу',
+                pt: 'Gateway inválido',
+                nl: 'Ongeldige Gateway',
+                de: 'Fehlerhafter Gateway',
+                es: 'Puerta de enlace no valida',
+                zh: '无效网关',
+            },
+            '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',
+                pt: 'O servidor recebeu uma resposta inválida do servidor upstream',
+                nl: 'De server ontving een ongeldig antwoord van een bovenliggende server',
+                de: 'Der Server hat eine ungültige Antwort vom Upstream-Server erhalten',
+                es: 'El servidor ha recibido una respuesta no válida del servidor de origen',
+                zh: '服务器从上游服务器收到了无效的响应',
+            },
+            'Service Unavailable': {
+                fr: 'Service indisponible',
+                ru: 'Сервис недоступен',
+                uk: 'Сервіс недоступний',
+                pt: 'Serviço não disponível',
+                nl: 'Dienst niet beschikbaar',
+                de: 'Dienst nicht verfügbar',
+                es: 'Servicio no disponible',
+                zh: '服务不可用',
+            },
+            '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',
+                pt: 'O servidor está temporariamente sobrecarregado ou inativo',
+                nl: 'De server is tijdelijk overbelast of niet bereikbaar',
+                de: 'Der Server ist vorübergehend überlastet oder ausgefallen',
+                es: 'El servidor está temporalmente sobrecargado o inactivo',
+                zh: '服务器暂时过载或不可用',
+            },
+            'Gateway Timeout': {
+                fr: 'Expiration Passerelle',
+                ru: 'Шлюз не отвечает',
+                uk: 'Шлюз не відповідає',
+                pt: 'Tempo limite do gateway excedido',
+                nl: 'Gateway Verlopen',
+                de: 'Gateway Zeitüberschreitung',
+                es: 'Tiempo límite de puerta de enlace excedido',
+                zh: '网关超时',
+            },
+            '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',
+                pt: 'O gateway esgotou o tempo limite',
+                nl: 'De verbinding naar de bovenliggende server is verlopen',
+                de: 'Das Zeitlimit für den Verbindungsaufbau mit dem Upstream-Server ist abgelaufen',
+                es: 'La puerta de enlace ha sobrepasado el tiempo límite',
+                zh: '网关响应已经超时',
+            },
+            'HTTP Version Not Supported': {
+                fr: 'Version HTTP non prise en charge',
+                ru: 'Версия HTTP не поддерживается',
+                uk: 'Версія НТТР не підтримується',
+                pt: 'Versão HTTP não suportada',
+                nl: 'HTTP-versie wordt niet ondersteunt',
+                de: 'HTTP-Version wird nicht unterstützt',
+                es: 'Versión de HTTP no soportada',
+                zh: 'HTTP版本不受支持',
+            },
+            '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',
+                pt: 'O servidor não suporta a versão do protocolo HTTP',
+                nl: 'De server ondersteunt deze HTTP-versie niet',
+                de: 'Der Server unterstützt die HTTP-Protokoll-Version nicht',
+                es: 'El servidor no soporta la versión del protocolo HTTP',
+                zh: '服务器不支持该HTTP协议版本',
+            },
+
+            'Host': {
+                fr: 'Hôte',
+                ru: 'Хост',
+                uk: 'Хост',
+                pt: 'Hospedeiro',
+                nl: 'Host',
+                de: 'Host',
+                es: 'Host',
+                zh: '主机',
+            },
+            'Original URI': {
+                fr: 'URI d’origine',
+                ru: 'Исходный URI',
+                uk: 'Вихідний URI',
+                pt: 'URI original',
+                nl: 'Originele URI',
+                de: 'Originale URI',
+                es: 'URI original',
+                zh: '原始URI',
+            },
+            'Forwarded for': {
+                fr: 'Transmis pour',
+                ru: 'Перенаправлен',
+                uk: 'Перенаправлений',
+                pt: 'Encaminhado para',
+                nl: 'Doorgestuurd voor',
+                de: 'Weitergeleitet für',
+                es: 'Remitido por',
+                zh: '转发自',
+            },
+            'Namespace': {
+                fr: 'Espace de noms',
+                ru: 'Пространство имён',
+                uk: 'Простір імен',
+                pt: 'Namespace',
+                nl: 'Elementnaam',
+                de: 'Namensraum',
+                es: 'Namespace',
+                zh: '命名空间',
+            },
+            'Ingress name': {
+                fr: 'Nom ingress',
+                ru: 'Имя Ingress',
+                uk: 'Ім\'я Ingress',
+                pt: 'Nome Ingress',
+                nl: 'Ingress naam',
+                de: 'Ingress Name',
+                es: 'Nombre Ingress',
+                zh: '入口名',
+            },
+            'Service name': {
+                fr: 'Nom du service',
+                ru: 'Имя сервиса',
+                uk: 'Ім\'я сервісу',
+                pt: 'Nome do Serviço',
+                nl: 'Service naam',
+                de: 'Service Name',
+                es: 'Nombre del servicio',
+                zh: '服务名',
+            },
+            'Service port': {
+                fr: 'Port du service',
+                ru: 'Порт сервиса',
+                uk: 'Порт сервісу',
+                pt: 'Porta do serviço',
+                nl: 'Service poort',
+                de: 'Service Port',
+                es: 'Puerto del servicio',
+                zh: '服务端口',
+            },
+            'Request ID': {
+                fr: 'Identifiant de la requête',
+                ru: 'ID запроса',
+                uk: 'ID запиту',
+                pt: 'ID da solicitação',
+                nl: 'ID van het verzoek',
+                de: 'Anfrage ID',
+                es: 'ID de la petición',
+                zh: '请求ID',
+            },
+            'Timestamp': {
+                fr: 'Horodatage',
+                ru: 'Временная метка',
+                uk: 'Тимчасова мітка',
+                pt: 'Timestamp',
+                nl: 'Tijdstempel',
+                de: 'Zeitstempel',
+                es: 'Timestamp',
+                zh: '时间戳',
+            },
+
+            'client-side error': {
+                fr: 'Erreur Client',
+                ru: 'ошибка на стороне клиента',
+                uk: 'помилка на стороні клієнта',
+                pt: 'erro do lado do cliente',
+                nl: 'fout aan de gebruikerskant',
+                de: 'Clientseitiger Fehler',
+                es: 'Error del lado del cliente',
+                zh: '客户端错误',
+            },
+            'server-side error': {
+                fr: 'Erreur Serveur',
+                ru: 'ошибка на стороне сервера',
+                uk: 'помилка на стороні сервера',
+                pt: 'erro do lado do servidor',
+                nl: 'fout aan de serverkant',
+                de: 'Serverseitiger Fehler',
+                es: 'Error del lado del servidor',
+                zh: '服务端错误',
+            },
+
+            'Your Client': {
+                fr: 'Votre Client',
+                ru: 'Ваш Браузер',
+                uk: 'Ваш Браузер',
+                pt: 'Seu Cliente',
+                nl: 'Jouw Client',
+                de: 'Ihr Client',
+                es: 'Tu cliente',
+                zh: '您的客户端',
+            },
+            'Network': {
+                fr: 'Réseau',
+                ru: 'Сеть',
+                uk: 'Сіть',
+                pt: 'Rede',
+                nl: 'Netwerk',
+                de: 'Netzwerk',
+                es: 'Red',
+                zh: '网络',
+            },
+            'Web Server': {
+                fr: 'Serveur Web',
+                ru: 'Web Сервер',
+                uk: 'Web Сервер',
+                pt: 'Servidor web',
+                nl: 'Web Server',
+                de: 'Webserver',
+                es: 'Servidor web',
+                zh: 'Web服务器',
+            },
+            'What happened?': {
+                fr: 'Que s’est-il passé ?',
+                ru: 'Что произошло?',
+                uk: 'Що сталося?',
+                pt: 'O que aconteceu?',
+                nl: 'Wat is er gebeurd?',
+                de: 'Was ist passiert?',
+                es: '¿Que ha pasado?',
+                zh: '发生了什么？',
+            },
+            'What can i do?': {
+                fr: 'Que puis-je faire ?',
+                ru: 'Что можно сделать?',
+                uk: 'Що можна зробити?',
+                pt: 'O que eu posso fazer?',
+                nl: 'Wat kan ik doen?',
+                de: 'Was kann ich machen?',
+                es: '¿Que puedo hacer?',
+                zh: '我能做什么？',
+            },
+            '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',
+                pt: 'Por favor, tente novamente em alguns minutos',
+                nl: 'Probeer het alstublieft opnieuw over een paar minuten',
+                de: 'Bitte versuchen Sie es in ein paar Minuten erneut',
+                es: 'Por favor, intente nuevamente en unos minutos',
+                zh: '请在几分钟后重试',
+            },
+            'Working': {
+                fr: 'Opérationnel',
+                ru: 'Работает',
+                uk: 'Працює',
+                pt: 'Funcionando',
+                nl: 'Functioneel',
+                de: 'Funktioniert',
+                es: 'Trabajando',
+                zh: '正常运行',
+            },
+            'Unknown': {
+                fr: 'Inconnu',
+                ru: 'Неизвестно',
+                uk: 'Невідомо',
+                pt: 'Desconhecido',
+                nl: 'Onbekend',
+                de: 'Unbekannt',
+                es: 'Desconocido',
+                zh: '未知',
+            },
+            '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',
+                pt: 'Tente alterar o método de solicitação, cabeçalhos, payload ou URL',
+                nl: 'Probeer het opnieuw met een andere methode, headers, payload of URL',
+                de: 'Bitte versuchen Sie, die Anfragemethode, Header, Payload oder URL zu ändern',
+                es: 'Por favor intente cambiar el método de la petición, cabeceras, carga o URL',
+                zh: '请尝试更改请求方法、标头、有效负载或URL',
+            },
+            'Please check your authorization data': {
+                fr: 'Veuillez vérifier vos données d’autorisation',
+                ru: 'Пожалуйста, проверьте данные авторизации',
+                uk: 'Будь ласка, перевірте дані авторизації',
+                pt: 'Verifique seus dados de autorização',
+                nl: 'Controleer de authenticatiegegevens',
+                de: 'Bitte überprüfen Sie Ihre Zugangsdaten',
+                es: 'Verifique sus datos de autorización',
+                zh: '请检查您的授权数据',
+            },
+            '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',
+                pt: 'Verifique novamente o URL e tente novamente',
+                nl: 'Controleer de URL en probeer het opnieuw',
+                de: 'Bitte überprüfen Sie die URL und versuchen Sie es erneut',
+                es: 'Verifique de nuevo la URL y vuelva a probar',
+                zh: '请再次检查URL并重试',
+            },
+        };
+
+        /**
+         * @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 +1,21 @@
+# 🔤 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)
+- 🇵🇹 Portuguese by [@fabtrompet](https://github.com/fabtrompet)
+- 🇳🇱 Dutch by [@SchoNie](https://github.com/SchoNie)
+- 🇩🇪 German by [@mschoeffmann](https://github.com/mschoeffmann)
+- 🇪🇸 Spanish by [@Runig006](https://github.com/Runig006)
+- 🇨🇳 Chinese by [@CDN18](https://github.com/CDN18)

templates/app-down.html

@@ -0,0 +1,244 @@
+<!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.bunny.net" crossorigin>
+    <link rel="dns-prefetch" href="https://fonts.bunny.net">
+    <link href="https://fonts.bunny.net/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>
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+            <circle class="st7" cx="349" cy="388.4" r="1"></circle>
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+            <circle class="st7" cx="142.9" cy="364.8" r="1"></circle>
+            <circle class="st7" cx="146.9" cy="366" r="1"></circle>
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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>
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+            <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>
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+            <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>
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+            <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>
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+        </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 l10n_enabled }}
+    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);
+    }
+    // {{ end }}
+</script>
+</body>
+<!--
+    Error {{ code }}: {{ message }}
+    Description: {{ description }}
+-->
+</html>

templates/cats.html

@@ -62,32 +62,40 @@
         {{ 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">Original URI</td>
+                    <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">Namespace</td>
+                    <td class="name" data-l10n>Namespace</td>
                     <td class="value">{{ namespace }}</td>
                 </tr>{{ end -}}
                 {{- if ingress_name }}<tr>
-                    <td class="name">Ingress name</td>
+                    <td class="name" data-l10n>Ingress name</td>
                     <td class="value">{{ ingress_name }}</td>
                 </tr>{{ end -}}
                 {{- if service_name }}<tr>
-                    <td class="name">Service name</td>
+                    <td class="name" data-l10n>Service name</td>
                     <td class="value">{{ service_name }}</td>
                 </tr>{{ end -}}
                 {{- if service_port }}<tr>
-                    <td class="name">Service port</td>
+                    <td class="name" data-l10n>Service port</td>
                     <td class="value">{{ service_port }}</td>
                 </tr>{{ end -}}
                 {{- if request_id }}<tr>
-                    <td class="name">Request ID</td>
+                    <td class="name" data-l10n>Request ID</td>
                     <td class="value">{{ request_id }}</td>
                 </tr>{{ end -}}
                 <tr>
-                    <td class="name">Timestamp</td>
+                    <td class="name" data-l10n>Timestamp</td>
                     <td class="value">{{ now.Unix }}</td>
                 </tr>
             </table>
@@ -95,6 +103,18 @@
         {{ end }}
     </div>
 </div>
+<script>
+    // {{ if l10n_enabled }}
+    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);
+    }
+    // {{ end }}
+</script>
 </body>
 <!--
     Error {{ code }}: {{ message }}

templates/connection.html

@@ -0,0 +1,273 @@
+<!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.bunny.net" crossorigin>
+    <link rel="dns-prefetch" href="https://fonts.bunny.net">
+    <link href="https://fonts.bunny.net/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 l10n_enabled }}
+    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);
+    }
+    // {{ end }}
+</script>
+<!--
+    Error {{ code }}: {{ message }}
+    Description: {{ description }}
+-->
+</html>

templates/ghost.html

@@ -9,7 +9,9 @@
     <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.bunny.net" crossorigin>
+    <link rel="dns-prefetch" href="https://fonts.bunny.net">
+    <link href="https://fonts.bunny.net/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;height:100vh;margin:0;font-size:0}
         .container {height:100vh;align-items:center;display:flex;justify-content:center;position:relative}
@@ -33,7 +35,7 @@
 <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>
@@ -46,41 +48,49 @@
             <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">Original URI</td>
+                    <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">Namespace</td>
+                    <td class="name" data-l10n>Namespace</td>
                     <td class="value">{{ namespace }}</td>
                 </tr>{{ end -}}
                 {{- if ingress_name }}<tr>
-                    <td class="name">Ingress name</td>
+                    <td class="name" data-l10n>Ingress name</td>
                     <td class="value">{{ ingress_name }}</td>
                 </tr>{{ end -}}
                 {{- if service_name }}<tr>
-                    <td class="name">Service name</td>
+                    <td class="name" data-l10n>Service name</td>
                     <td class="value">{{ service_name }}</td>
                 </tr>{{ end -}}
                 {{- if service_port }}<tr>
-                    <td class="name">Service port</td>
+                    <td class="name" data-l10n>Service port</td>
                     <td class="value">{{ service_port }}</td>
                 </tr>{{ end -}}
                 {{- if request_id }}<tr>
-                    <td class="name">Request ID</td>
+                    <td class="name" data-l10n>Request ID</td>
                     <td class="value">{{ request_id }}</td>
                 </tr>{{ end -}}
                 <tr>
-                    <td class="name">Timestamp</td>
+                    <td class="name" data-l10n>Timestamp</td>
                     <td class="value">{{ now.Unix }}</td>
                 </tr>
             </table>
@@ -88,6 +98,18 @@
         {{ end }}
     </div>
 </div>
+<script>
+    // {{ if l10n_enabled }}
+    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);
+    }
+    // {{ end }}
+</script>
 </body>
 <!--
     Error {{ code }}: {{ message }}

templates/hacker-terminal.html

@@ -9,8 +9,9 @@
     <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.bunny.net" crossorigin>
+    <link rel="dns-prefetch" href="https://fonts.bunny.net">
+    <link href="https://fonts.bunny.net/css2?family=Inconsolata:wght@400;700&display=swap" rel="stylesheet">
     <style>
         /** Idea author: https://codepen.io/robinselmer */
         html, body {
@@ -145,21 +146,35 @@
 <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 original_uri }}<p class="output small">Original URI: <code>{{ original_uri }}</code></p>{{ end -}}
-        {{- if namespace }}<p class="output small">Namespace: <code>{{ namespace }}</code></p>{{ end -}}
-        {{- if ingress_name }}<p class="output small">Ingress name: <code>{{ ingress_name }}</code></p>{{ end -}}
-        {{- if service_name }}<p class="output small">Service name: <code>{{ service_name }}</code></p>{{ end -}}
-        {{- if service_port }}<p class="output small">Service port: <code>{{ service_port }}</code></p>{{ end -}}
-        {{- if request_id }}<p class="output small">Request ID: <code>{{ request_id }}</code></p>{{ end -}}
-        <p class="output small">Timestamp: <code>{{ now.Unix }}</code></p>
+        {{- 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 l10n_enabled }}
+    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);
+    }
+    // {{ end }}
+</script>
 </body>
 <!--
     Error {{ code }}: {{ message }}

templates/l7-dark.html

@@ -9,8 +9,9 @@
     <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=Nunito" rel="stylesheet">
+    <link rel="preconnect" href="https://fonts.bunny.net" crossorigin>
+    <link rel="dns-prefetch" href="https://fonts.bunny.net">
+    <link href="https://fonts.bunny.net/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;font-size:0}
         .full-height {height:100vh}
@@ -33,39 +34,47 @@
             <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">Original URI</td>
+                    <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">Namespace</td>
+                    <td class="name" data-l10n>Namespace</td>
                     <td class="value">{{ namespace }}</td>
                 </tr>{{ end -}}
                 {{- if ingress_name }}<tr>
-                    <td class="name">Ingress name</td>
+                    <td class="name" data-l10n>Ingress name</td>
                     <td class="value">{{ ingress_name }}</td>
                 </tr>{{ end -}}
                 {{- if service_name }}<tr>
-                    <td class="name">Service name</td>
+                    <td class="name" data-l10n>Service name</td>
                     <td class="value">{{ service_name }}</td>
                 </tr>{{ end -}}
                 {{- if service_port }}<tr>
-                    <td class="name">Service port</td>
+                    <td class="name" data-l10n>Service port</td>
                     <td class="value">{{ service_port }}</td>
                 </tr>{{ end -}}
                 {{- if request_id }}<tr>
-                    <td class="name">Request ID</td>
+                    <td class="name" data-l10n>Request ID</td>
                     <td class="value">{{ request_id }}</td>
                 </tr>{{ end -}}
                 <tr>
-                    <td class="name">Timestamp</td>
+                    <td class="name" data-l10n>Timestamp</td>
                     <td class="value">{{ now.Unix }}</td>
                 </tr>
             </table>
@@ -73,6 +82,18 @@
         {{ end }}
     </div>
 </div>
+<script>
+    // {{ if l10n_enabled }}
+    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);
+    }
+    // {{ end }}
+</script>
 </body>
 <!--
     Error {{ code }}: {{ message }}

templates/l7-light.html

@@ -9,10 +9,13 @@
     <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=Nunito" rel="stylesheet">
+    <link rel="preconnect" href="https://fonts.bunny.net" crossorigin>
+    <link rel="dns-prefetch" href="https://fonts.bunny.net">
+    <link href="https://fonts.bunny.net/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;font-size: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}
@@ -20,7 +23,7 @@
         .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:#777}
+        .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 }} */
@@ -33,39 +36,47 @@
             <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">Original URI</td>
+                    <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">Namespace</td>
+                    <td class="name" data-l10n>Namespace</td>
                     <td class="value">{{ namespace }}</td>
                 </tr>{{ end -}}
                 {{- if ingress_name }}<tr>
-                    <td class="name">Ingress name</td>
+                    <td class="name" data-l10n>Ingress name</td>
                     <td class="value">{{ ingress_name }}</td>
                 </tr>{{ end -}}
                 {{- if service_name }}<tr>
-                    <td class="name">Service name</td>
+                    <td class="name" data-l10n>Service name</td>
                     <td class="value">{{ service_name }}</td>
                 </tr>{{ end -}}
                 {{- if service_port }}<tr>
-                    <td class="name">Service port</td>
+                    <td class="name" data-l10n>Service port</td>
                     <td class="value">{{ service_port }}</td>
                 </tr>{{ end -}}
                 {{- if request_id }}<tr>
-                    <td class="name">Request ID</td>
+                    <td class="name" data-l10n>Request ID</td>
                     <td class="value">{{ request_id }}</td>
                 </tr>{{ end -}}
                 <tr>
-                    <td class="name">Timestamp</td>
+                    <td class="name" data-l10n>Timestamp</td>
                     <td class="value">{{ now.Unix }}</td>
                 </tr>
             </table>
@@ -73,6 +84,18 @@
         {{ end }}
     </div>
 </div>
+<script>
+    // {{ if l10n_enabled }}
+    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);
+    }
+    // {{ end }}
+</script>
 </body>
 <!--
     Error {{ code }}: {{ message }}

templates/lost-in-space.html

@@ -0,0 +1,399 @@
+<!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.bunny.net" crossorigin>
+    <link rel="dns-prefetch" href="https://fonts.bunny.net">
+    <link href="https://fonts.bunny.net/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 l10n_enabled }}
+    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);
+    }
+    // {{ end }}
+</script>
+
+</body>
+<!--
+    Error {{ code }}: {{ message }}
+    Description: {{ description }}
+-->
+</html>

templates/matrix.html

@@ -0,0 +1,282 @@
+<!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.bunny.net" crossorigin>
+    <link rel="dns-prefetch" href="https://fonts.bunny.net">
+    <link href="https://fonts.bunny.net/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 l10n_enabled }}
+    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);
+    }
+    // {{ end }}
+</script>
+</body>
+<!--
+    Error {{ code }}: {{ message }}
+    Description: {{ description }}
+-->
+</html>

templates/noise.html

@@ -3,7 +3,9 @@
     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 }}
@@ -128,7 +130,7 @@
 <div class="container-center">
     <div>
         <h1>{{ code }}</h1>
-        <h2>{{ description }}</h2>
+        <h2 data-l10n>{{ description }}</h2>
     </div>
 </div>
 
@@ -172,6 +174,17 @@
     window.addEventListener('beforeunload', function (/** @param BeforeUnloadEvent event */ event) {
         window.clearInterval(flickerInterval);
     });
+
+    // {{ if l10n_enabled }}
+    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);
+    }
+    // {{ end }}
 </script>
 </body>
 <!--

templates/readme.md

@@ -1 +1,39 @@
-# TODO: Write docs
+# 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                                   |                                              |
+| `{{ if l10n_enabled }}...{{ end }}`  | Logical operator (l10n is enabled?)                           |                                              |
+| `{{ if l10n_disabled }}...{{ 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

@@ -72,48 +72,63 @@
 <body>
 <div class="flex-center full-height">
     <div>
-        <span id="error_text">{{ code }}: {{ message }}</span>
+        <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">Original URI:</td>
+                    <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">Namespace:</td>
+                    <td class="name"><span data-l10n>Namespace</span>:</td>
                     <td class="value">{{ namespace }}</td>
                 </tr>
                 {{ end -}}
                 {{- if ingress_name }}
                 <tr>
-                    <td class="name">Ingress name:</td>
+                    <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">Service name:</td>
+                    <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">Service port:</td>
+                    <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">Request ID:</td>
+                    <td class="name"><span data-l10n>Request ID</span>:</td>
                     <td class="value">{{ request_id }}</td>
                 </tr>
                 {{ end -}}
                 <tr>
-                    <td class="name">Timestamp:</td>
+                    <td class="name"><span data-l10n>Timestamp</span>:</td>
                     <td class="value">{{ now.Unix }}</td>
                 </tr>
             </table>
@@ -125,24 +140,74 @@
 <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;
-    }, 450 / 60);
+            return s;
+        };
+
+        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 () {
@@ -150,16 +215,16 @@
     }, 550);
     // {{ end }}
 
-    window.setTimeout(function () {
-        let revealInterval = window.setInterval(function () {
-            if (progress < text.length) {
-                progress++;
-            } else {
-                window.clearInterval(revealInterval);
-                window.clearInterval(scrambleInterval);
-            }
-        }, 70);
-    }, 350);
+    // {{ if l10n_enabled }}
+    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);
+    }
+    // {{ end }}
 </script>
 </body>
 <!--

test/hurl/code_502_json.hurl

@@ -7,6 +7,8 @@ X-Ingress-Name: baz
 X-Service-Name: aaa
 X-Service-Port: bbb
 X-Request-ID: ccc
+X-Forwarded-For: ddd
+Host: eee
 
 HTTP/* 200
 
@@ -23,6 +25,8 @@ 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

test/hurl/code_502_xml.hurl

@@ -7,6 +7,8 @@ X-Ingress-Name: baz
 X-Service-Name: aaa
 X-Service-Port: bbb
 X-Request-ID: ccc
+X-Forwarded-For: ddd
+Host: eee
 
 HTTP/* 200
 
@@ -22,6 +24,8 @@ 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

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/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