New template orient added (#190 )

* added orient theme * added creation test for orient theme * Added new Orient theme to CHANGELOG.md * fix: Template fixed a bit --------- Co-authored-by: Paramtamtam <7326800+tarampampam@users.noreply.github.com>
feat: Non-existing pages now return styled 404 status page (with 404 status code) (#189 )
2024-08-30 18:22:40 +00:00 · 2023-04-17 15:06:28 +04:00 · 2023-04-07 14:42:00 +04:00 · 2023-04-02 02:27:23 +00:00 · 2023-04-02 02:24:01 +00:00 · 2023-04-02 02:23:55 +00:00
56 changed files with 1347 additions and 1391 deletions
--- a/.dockerignore
+++ b/.dockerignore
@ -1,14 +1,9 @@
-.dockerignore
+## Ignore everything
-Dockerfile
+*
-.github
+
-.git
+## Except the following files and directories
-.gitignore
+!/cmd
-.editorconfig
+!/internal
-.idea
+!/templates
-.vscode
+!/error-pages.yml
-test
+!/go.*
 temp
 tmp
 LICENSE
 Makefile
 error-pages
--- a/.editorconfig
+++ b/.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, json}]
 indent_size = 2
 trim_trailing_whitespace = true
 [{Makefile, go.mod, *.go}]
 indent_style = tab
--- a/.github/workflows/documentation.yml
+++ b/.github/workflows/documentation.yml
@ -8,7 +8,7 @@ on:
 jobs:
  docker-hub-description:
    name: Docker Hub Description
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@ -7,7 +7,7 @@ on:
 jobs:
  purge-cdn-cache:
    name: Purge jsDelivr CDN cache
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
    steps:
      - uses: gacts/purge-jsdelivr-cache@v1 # Action page: <https://github.com/gacts/purge-jsdelivr-cache>
        with:
@ -19,31 +19,30 @@ jobs:
  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@v3
        with: {go-version: 1.19}
      - uses: actions/checkout@v3
-      - uses: gacts/github-slug@v1
+      - uses: gacts/setup-go-with-cache@v1
-        id: slug
+        with: {go-version-file: go.mod}
      - {uses: gacts/github-slug@v1, id: slug}
      - name: Generate builder values
        id: values
-        run: echo "::set-output name=binary-name::error-pages-${{ matrix.os }}-${{ matrix.arch }}"
+        run: echo "binary-name=error-pages-${{ matrix.os }}-${{ matrix.arch }}" >> $GITHUB_OUTPUT
      - 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.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
@ -56,12 +55,11 @@ jobs:
  docker-image:
    name: Build docker image
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
-      - uses: gacts/github-slug@v1
+      - {uses: gacts/github-slug@v1, id: slug}
        id: slug
      - uses: docker/setup-qemu-action@v2 # Action page: <https://github.com/docker/setup-qemu-action>
@ -78,7 +76,7 @@ jobs:
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}
-      - uses: docker/build-push-action@v3 # 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
@ -97,11 +95,10 @@ jobs:
  demo:
    name: Update the demonstration
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
    needs: [docker-image]
    steps:
-      - uses: gacts/github-slug@v1
+      - {uses: gacts/github-slug@v1, id: slug}
        id: slug
      - name: Take rendered templates from the built docker image
        run: |
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@ -15,7 +15,7 @@ concurrency:
 jobs: # Docs: <https://git.io/JvxXE>
  gitleaks:
    name: Gitleaks
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
        with: {fetch-depth: 0}
@ -25,20 +25,24 @@ jobs: # Docs: <https://git.io/JvxXE>
  golangci-lint:
    name: Golang-CI (lint)
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
-      - uses: golangci/golangci-lint-action@v3 # Action page: <https://github.com/golangci/golangci-lint-action>
+      - 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@v3
-      - uses: actions/setup-node@v3
+      - uses: gacts/setup-node-with-cache@v1
-        with: {node-version: '16'}
+        with: {node-version: 16}
      - name: Install linter
        run: npm install -g ajv-cli # Package page: <https://www.npmjs.com/package/ajv-cli>
@ -48,12 +52,12 @@ jobs: # Docs: <https://git.io/JvxXE>
  lint-l10n:
    name: Lint l10n file(s)
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
-      - uses: actions/setup-node@v3
+      - uses: gacts/setup-node-with-cache@v1
-        with: {node-version: '16'}
+        with: {node-version: 16}
      - name: Install eslint
        run: npm install -g eslint@v8 # Package page: <https://www.npmjs.com/package/eslint>
@ -64,24 +68,13 @@ jobs: # Docs: <https://git.io/JvxXE>
  go-test:
    name: Unit tests
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
    steps:
      - uses: actions/setup-go@v3
        with: {go-version: 1.19}
      - 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: gacts/setup-go-with-cache@v1
-        uses: actions/cache@v3
+        with: {go-version-file: go.mod}
        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
      - name: Run Unit tests
        run: go test -race -covermode=atomic -coverprofile /tmp/coverage.txt ./...
@ -94,7 +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:
@ -102,34 +95,24 @@ jobs: # Docs: <https://git.io/JvxXE>
        arch: [amd64]  # amd64, 386
    needs: [golangci-lint, go-test, validate-config-file]
    steps:
      - uses: actions/setup-go@v3
        with: {go-version: 1.19}
      - uses: actions/checkout@v3
-      - uses: gacts/github-slug@v1
+      - uses: gacts/setup-go-with-cache@v1
-        id: slug
+        with: {go-version-file: go.mod}
-      - name: Go modules Cache # Docs: <https://git.io/JfAKn#go---modules>
+      - {uses: gacts/github-slug@v1, id: slug}
        uses: actions/cache@v3
        with:
          path: ~/go/pkg/mod
          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
          restore-keys: ${{ runner.os }}-go-
      - run: go mod download
      - 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@v3
        with:
@ -140,7 +123,7 @@ 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@v3
@ -155,7 +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: |
@ -171,18 +154,18 @@ jobs: # Docs: <https://git.io/JvxXE>
          test -f ./out/app-down/404.html
          test -f ./out/connection/404.html
          test -f ./out/matrix/404.html
          test -f ./out/orient/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@v3
-      - uses: gacts/github-slug@v1
+      - {uses: gacts/github-slug@v1, id: slug}
        id: slug
-      - uses: docker/build-push-action@v3 # 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
@ -200,7 +183,7 @@ 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@v3 # is needed for `upload-sarif` action
@ -210,7 +193,7 @@ jobs: # Docs: <https://git.io/JvxXE>
          name: docker-image
          path: .artifact
-      - uses: aquasecurity/trivy-action@0.8.0 # action page: <https://github.com/aquasecurity/trivy-action>
+      - uses: aquasecurity/trivy-action@0.9.2 # action page: <https://github.com/aquasecurity/trivy-action>
        with:
          input: .artifact/docker-image.tar
          format: sarif
@ -225,7 +208,7 @@ jobs: # Docs: <https://git.io/JvxXE>
  poke-docker-image:
    name: Run the docker image
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
    needs: [docker-image]
    timeout-minutes: 2
    steps:
@ -247,7 +230,7 @@ jobs: # Docs: <https://git.io/JvxXE>
      - 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()
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@ -4,6 +4,46 @@ 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].
 ## v2.23.0
 ### Added
 - Template `orient` [#190]
 [#190]:https://github.com/tarampampam/error-pages/pull/190
 ## v2.22.0
 ### Changed
 - Non-existing pages now return styled `404` status page (with `404` status code) [#188]
 [#188]:https://github.com/tarampampam/error-pages/issues/188
 ## 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
--- a/12
+++ b/12
@ -1,7 +1,7 @@
 # syntax=docker/dockerfile:1.2
 # Image page: <https://hub.docker.com/_/golang>
-FROM golang:1.19-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 "$LDFLAGS" -o ./error-pages ./cmd/error-pages/ \
-    && ./error-pages version \
+    && ./error-pages --version \
    && ./error-pages -h
 WORKDIR /tmp/rootfs
@ -38,7 +38,7 @@ WORKDIR /tmp/rootfs/opt
 # generate static error pages (for usage inside another docker images, for example)
 RUN set -x \
-    && ./../bin/error-pages --config-file ./error-pages.yml build ./html --verbose --index \
+    && ./../bin/error-pages --verbose build --config-file ./error-pages.yml --index ./html \
    && ls -l ./html
 # use empty filesystem
@ -72,8 +72,8 @@ ENV LISTEN_PORT="8080" \
    DISABLE_L10N="false"
 # Docs: <https://docs.docker.com/engine/reference/builder/#healthcheck>
-HEALTHCHECK --interval=7s --timeout=2s CMD ["/bin/error-pages", "healthcheck", "--log-json"]
+HEALTHCHECK --interval=7s --timeout=2s CMD ["/bin/error-pages", "--log-json", "healthcheck"]
 ENTRYPOINT ["/bin/error-pages"]
-CMD ["serve", "--log-json"]
+CMD ["--log-json", "serve"]
--- a/4
+++ b/4
@ -3,7 +3,7 @@
 # Makefile readme (en): <https://www.gnu.org/software/make/manual/html_node/index.html#SEC_Contents>
 SHELL = /bin/sh
-LDFLAGS = "-s -w -X github.com/tarampampam/error-pages/internal/version.version=$(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
--- a/README.md
+++ b/README.md
@ -5,8 +5,8 @@
 <p align="center">
  <a href="#"><img src="https://img.shields.io/github/go-mod/go-version/tarampampam/error-pages?longCache=true&label=&logo=go&logoColor=white&style=flat-square" alt="" /></a>
  <a href="https://codecov.io/gh/tarampampam/error-pages"><img src="https://img.shields.io/codecov/c/github/tarampampam/error-pages/master.svg?maxAge=30&label=&logo=codecov&logoColor=white&style=flat-square" alt="" /></a>
-  <a href="https://github.com/tarampampam/error-pages/actions"><img src="https://img.shields.io/github/workflow/status/tarampampam/error-pages/tests?maxAge=30&label=tests&logo=github&style=flat-square" alt="" /></a>
+  <a href="https://github.com/tarampampam/error-pages/actions"><img src="https://img.shields.io/github/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/workflow/status/tarampampam/error-pages/release?maxAge=30&label=release&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>
@ -40,8 +40,6 @@ One day you may want to replace the standard error pages of your HTTP server wit
 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`         |
@ -125,6 +123,7 @@ Transfer/sec:    140.23MB
 |    `app-down`     |           [![app-down][app-down-screen]][app-down-link]            |
 |   `connection`    |        [![connection][connection-screen]][connection-link]         |
 |     `matrix`      |              [![matrix][matrix-screen]][matrix-link]               |
 |     `orient`      |              [![orient][orient-screen]][orient-link]               |
 > Note: `noise` template highly uses the CPU, be careful
@ -150,6 +149,8 @@ Transfer/sec:    140.23MB
 [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
 [orient-screen]:https://hsto.org/webt/pz/eu/v_/pzeuv_lyeqr0xpusa4zfrtgk7sa.png
 [orient-link]:https://tarampampam.github.io/error-pages/orient/404.html
 ## 🦾 Contributors
--- a/cmd/error-pages/main.go
+++ b/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 := (cli.NewApp(filepath.Base(os.Args[0]))).Run(os.Args); err != nil {
 	if err := cmd.Execute(); err != nil {
 		_, _ = color.New(color.FgHiRed, color.Bold).Fprintln(os.Stderr, err.Error())
 		return 1
--- a/cmd/error-pages/main_test.go
+++ b/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, "USAGE:")
-	assert.Contains(t, output, "Available Commands:")
+	assert.Contains(t, output, "COMMANDS:")
-	assert.Contains(t, output, "Flags:")
+	assert.Contains(t, output, "GLOBAL OPTIONS:")
 }
 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")
 }
--- a/docker-compose.yml
+++ b/docker-compose.yml
@ -4,11 +4,12 @@ version: '3.8'
 volumes:
  tmp-data: {}
  golint-go: {}
  golint-cache: {}
 services:
  app: &app-service
-    image: golang:1.19-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
@ -18,32 +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: sh -c "go build -o /tmp/app ./cmd/error-pages && /tmp/app serve"
+    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', '/tmp/app', 'healthcheck', '--log-json']
+      test: ['CMD', '/tmp/app', '--log-json', 'healthcheck']
      interval: 4s
      timeout: 1s
      start_period: 5s
      retries: 5
  golint:
-    image: golangci/golangci-lint:v1.50-alpine # Image page: <https://hub.docker.com/r/golangci/golangci-lint>
+    image: golangci/golangci-lint:v1.52-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:1.7.0
+    image: orangeopensource/hurl:1.8.0
    volumes:
      - .:/src:ro
    working_dir: /src
    depends_on:
      web: {condition: service_healthy}
    security_opt: [no-new-privileges:true]
--- a/error-pages.yml
+++ b/error-pages.yml
@ -15,6 +15,7 @@ templates:
  - path: ./templates/app-down.html
  - path: ./templates/connection.html
  - path: ./templates/matrix.html
  - path: ./templates/orient.html
 formats:
  json:
--- a/go.mod
+++ b/go.mod
@ -1,41 +1,48 @@
-module github.com/tarampampam/error-pages
+module gh.tarampamp.am/error-pages
-go 1.19
+go 1.20
 require (
-	github.com/a8m/envsubst v1.3.0
+	github.com/a8m/envsubst v1.4.2
-	github.com/fasthttp/router v1.4.13
+	github.com/fasthttp/router v1.4.18
-	github.com/fatih/color v1.13.0
+	github.com/fatih/color v1.15.0
 	github.com/kami-zh/go-capturer v0.0.0-20171211120116-e492ea43421d
 	github.com/pkg/errors v0.9.1
-	github.com/prometheus/client_golang v1.13.0
+	github.com/prometheus/client_golang v1.14.0
 	github.com/prometheus/client_model v0.3.0
-	github.com/spf13/cobra v1.6.1
+	github.com/stretchr/testify v1.8.2
-	github.com/spf13/pflag v1.0.5
+	github.com/urfave/cli/v2 v2.25.1
-	github.com/stretchr/testify v1.8.1
+	github.com/valyala/fasthttp v1.45.0
-	github.com/valyala/fasthttp v1.41.0
+	go.uber.org/automaxprocs v1.5.2
-	go.uber.org/zap v1.23.0
+	go.uber.org/goleak v1.2.1
 	go.uber.org/zap v1.24.0
 	gopkg.in/yaml.v3 v3.0.1
 )
 require (
-	github.com/andybalholm/brotli v1.0.4 // 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 v1.0.1 // indirect
+	github.com/json-iterator/go v1.1.12 // indirect
-	github.com/klauspost/compress v1.15.9 // indirect
+	github.com/klauspost/compress v1.16.3 // indirect
-	github.com/mattn/go-colorable v0.1.12 // indirect
+	github.com/kr/text v0.2.0 // indirect
-	github.com/mattn/go-isatty v0.0.14 // indirect
+	github.com/mattn/go-colorable v0.1.13 // indirect
-	github.com/matttproud/golang_protobuf_extensions v1.0.1 // 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 v0.37.0 // indirect
+	github.com/prometheus/common v0.40.0 // indirect
-	github.com/prometheus/procfs v0.8.0 // indirect
+	github.com/prometheus/procfs v0.9.0 // indirect
-	github.com/savsgio/gotils v0.0.0-20220530130905-52f3993e8d6d // 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
+	github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673 // indirect
-	go.uber.org/multierr v1.6.0 // indirect
+	go.uber.org/atomic v1.10.0 // indirect
-	golang.org/x/sys v0.0.0-20220728004956-3c1f35247d10 // indirect
+	go.uber.org/multierr v1.9.0 // indirect
 	golang.org/x/sys v0.6.0 // indirect
 	google.golang.org/protobuf v1.28.1 // indirect
 )
--- a/go.sum
+++ b/go.sum
@ -1,540 +1,105 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+github.com/a8m/envsubst v1.4.2 h1:4yWIHXOLEJHQEFd4UjrWDrYeYlV7ncFWJOCBRLOZHQg=
-cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+github.com/a8m/envsubst v1.4.2/go.mod h1:MVUTQNGQ3tsjOOtKCNd+fl8RzhsXcDvvAEzkhGtlsbY=
-cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+github.com/andybalholm/brotli v1.0.5 h1:8uQZIdzKmjc/iuPu7O2ioW48L81FgatrcpfFmiq/cCs=
-cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+github.com/andybalholm/brotli v1.0.5/go.mod h1:fO7iG3H7G2nSZ7m0zPUDn85XEX2GTukHGRSepvi9Eig=
 cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
 cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
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 cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
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 cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
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 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=
 cloud.google.com/go/storage v1.8.0/go.mod h1:Wv1Oy7z6Yz3DshWRJFhqM/UCfaWIRTdp0RXyy7KQOVs=
 cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0=
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
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 github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
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 github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
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 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
 github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
-github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
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-github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
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 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20191125211704-12ad95a8df72/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200222043503-6f7a984d4dc4/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
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 github.com/go-kit/kit v0.9.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
 github.com/go-kit/log v0.1.0/go.mod h1:zbhenjAZHb184qTLMA9ZjW7ThYL0H2mk7Q6pNt4vbaY=
 github.com/go-kit/log v0.2.0/go.mod h1:NwTd00d/i8cPZ3xOwwiv2PO5MOcx78fFErGNcVmBjv0=
 github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE=
 github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk=
 github.com/go-logfmt/logfmt v0.5.0/go.mod h1:wCYkCAKZfumFQihp8CzCvQ3paCTfi41vtzG1KdI/P7A=
 github.com/go-logfmt/logfmt v0.5.1/go.mod h1:WYhtIu8zTZfxdn5+rREduYbwxfcBr/Vr6KEVveWlfTs=
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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=
--- a/internal/breaker/os_signal_test.go
+++ b/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) {
--- a/internal/checkers/health_test.go
+++ b/internal/checkers/health_test.go
@ -9,7 +9,7 @@ import (
 	"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)
--- a/internal/checkers/live_test.go
+++ b/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) {
--- a/internal/cli/app.go
+++ b/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()},
 			},
 		},
 	}
 }
--- a/internal/cli/app_test.go
+++ b/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"}))
 }
--- a/internal/cli/build/command.go
+++ b/internal/cli/build/command.go
@ -5,60 +5,59 @@ import (
 	"path"
 	"github.com/pkg/errors"
-	"github.com/spf13/cobra"
+	"github.com/urfave/cli/v2"
 	"github.com/tarampampam/error-pages/internal/config"
 	"github.com/tarampampam/error-pages/internal/tpl"
 	"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 {
+func NewCommand(log *zap.Logger) *cli.Command {
-	var (
+	var cmd = command{}
-		generateIndex bool
+
-		disableL10n   bool
+	const (
-		cfg           *config.Config
+		generateIndexFlagName = "index"
 		disableL10nFlagName   = "disable-l10n"
 	)
-	cmd := &cobra.Command{
+	cmd.c = &cli.Command{
-		Use:     "build <output-directory>",
+		Name:        "build",
-		Aliases: []string{"b"},
+		Aliases:     []string{"b"},
-		Short:   "Build the error pages",
+		Usage:       "build <output-directory>",
-		Args:    cobra.ExactArgs(1),
+		Description: "Build the error pages",
-		PreRunE: func(*cobra.Command, []string) (err error) {
+		Action: func(c *cli.Context) error {
-			if configFile == nil {
+			cfg, cfgErr := config.FromYamlFile(c.String(shared.ConfigFileFlag.Name))
-				return errors.New("path to the config file is required for this command")
+			if cfgErr != nil {
 				return cfgErr
 			}
-			if cfg, err = config.FromYamlFile(*configFile); err != nil {
+			if c.Args().Len() != 1 {
 				return err
 			}
 			return
 		},
 		RunE: func(_ *cobra.Command, args []string) error {
 			if len(args) != 1 {
 				return errors.New("wrong arguments count")
 			}
-			return run(log, cfg, args[0], generateIndex, disableL10n)
+			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(
+	return cmd.c
 		&generateIndex,
 		"index", "i",
 		false,
 		"generate index page",
 	)
 	cmd.Flags().BoolVarP(
 		&disableL10n,
 		"disable-l10n", "",
 		false,
 		"disable error pages localization",
 	)
 	return cmd
 }
 const (
@ -68,14 +67,14 @@ const (
 	outDirPerm       = os.FileMode(0775)
 )
-func run(log *zap.Logger, cfg *config.Config, outDirectoryPath string, generateIndex, disableL10n bool) error { //nolint:funlen,lll
+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")
 	}
@ -86,7 +85,7 @@ func run(log *zap.Logger, cfg *config.Config, outDirectoryPath string, generateI
 		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
 			}
@ -138,7 +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) {
--- a/internal/cli/build/command_test.go
+++ b/internal/cli/build/command_test.go
@ -1,7 +1,26 @@
 package build_test
-import "testing"
+import (
 	"flag"
 	"testing"
-func TestNothing(t *testing.T) {
+	"github.com/stretchr/testify/assert"
-	t.Skip("tests for this package have not been implemented yet")
+	"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")
 }
--- a/internal/cli/build/index.tpl.html
+++ b/internal/cli/build/index.tpl.html
@ -34,7 +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>
--- a/internal/cli/healthcheck/command.go
+++ b/internal/cli/healthcheck/command.go
@ -2,57 +2,35 @@
 package healthcheck
 import (
-	"fmt"
+	"errors"
-	"strconv"
+	"math"
-	"github.com/spf13/cobra"
+	"github.com/urfave/cli/v2"
 	"github.com/spf13/pflag"
-	"github.com/tarampampam/error-pages/internal/env"
+	"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 {
+func NewCommand(checker checker) *cli.Command {
-	var port uint16
+	return &cli.Command{
-
+		Name:    "healthcheck",
 	cmd := &cobra.Command{
 		Use:     "healthcheck",
 		Aliases: []string{"chk", "health", "check"},
-		Short:   "Health checker for the HTTP server. Use case - docker healthcheck",
+		Usage:   "Health checker for the HTTP server. Use case - docker healthcheck",
-		PreRunE: func(c *cobra.Command, _ []string) (lastErr error) {
+		Action: func(c *cli.Context) error {
-			c.Flags().VisitAll(func(flag *pflag.Flag) {
+			var port = c.Uint(shared.ListenPortFlag.Name)
 				// 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 {
 							port = uint16(p)
 						} else {
 							lastErr = fmt.Errorf("wrong TCP port environment variable [%s] value", envPort)
 						}
 					}
 				}
 			})
-			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 {
+		Flags: []cli.Flag{
-			return checker.Check(port)
+			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
 }
--- a/internal/cli/healthcheck/command_test.go
+++ b/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.Run(cli.NewContext(cli.NewApp(), &flag.FlagSet{}, nil)))
 		assert.NoError(t, cmd.Execute())
 	})
 	assert.Empty(t, output)
 }
 func TestCommandRunFailed(t *testing.T) {
 	cmd := healthcheck.NewCommand(&fakeChecker{err: errors.New("foo err")})
 	cmd.SetArgs([]string{})
-	output := capturer.CaptureStderr(func() {
+	assert.ErrorContains(t, cmd.Run(cli.NewContext(cli.NewApp(), &flag.FlagSet{}, nil)), "foo err")
 		assert.Error(t, cmd.Execute())
 	})
 	assert.Contains(t, output, "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 {
+	assert.ErrorContains(t, err, "port value out of range")
 		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)
 }
--- a/internal/cli/root.go
+++ b/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
 }
--- a/internal/cli/root_test.go
+++ b/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)
 }
--- a/internal/cli/serve/command.go
+++ b/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/urfave/cli/v2"
 	"github.com/tarampampam/error-pages/internal/breaker"
 	"github.com/tarampampam/error-pages/internal/config"
 	appHttp "github.com/tarampampam/error-pages/internal/http"
 	"github.com/tarampampam/error-pages/internal/pick"
 	"go.uber.org/zap"
 	"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 {
+func NewCommand(log *zap.Logger) *cli.Command { //nolint:funlen
-	var (
+	var cmd = command{}
 		f   flags
 		cfg *config.Config
 	)
-	cmd := &cobra.Command{
+	cmd.c = &cli.Command{
-		Use:     "serve",
+		Name:    "serve",
 		Aliases: []string{"s", "server"},
-		Short:   "Start HTTP server",
+		Usage:   "Start HTTP server",
-		PreRunE: func(cmd *cobra.Command, _ []string) (err error) {
+		Action: func(c *cli.Context) error {
-			if configFile == nil {
+			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")
-			}
+			} else if loadedCfg, err := config.FromYamlFile(c.String(shared.ConfigFileFlag.Name)); err != nil {
 			if err = f.OverrideUsingEnv(cmd.Flags()); err != nil {
 				return err
 			} else {
 				cfg = loadedCfg
 			}
-			if cfg, err = config.FromYamlFile(*configFile); err != nil {
+			var (
-				return err
+				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, cfg, f) },
 	}
-	f.Init(cmd.Flags())
+	return cmd.c
 	return cmd
 }
-// run current command.
+// Run current command.
-func run(parentCtx context.Context, log *zap.Logger, cfg *config.Config, f flags) error { //nolint:funlen
+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
@ -70,8 +181,6 @@ func run(parentCtx context.Context, log *zap.Logger, cfg *config.Config, f flags
 	var (
 		templateNames = cfg.TemplateNames()
 		picker        interface{ Pick() string }
 		opt = f.ToOptions()
 	)
 	switch opt.Template.Name {
@ -124,8 +233,8 @@ func run(parentCtx context.Context, log *zap.Logger, cfg *config.Config, f flags
 		defer close(errCh)
 		log.Info("Server starting",
-			zap.String("addr", f.Listen.IP),
+			zap.String("addr", ip),
-			zap.Uint16("port", f.Listen.Port),
+			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),
@ -133,7 +242,7 @@ func run(parentCtx context.Context, log *zap.Logger, cfg *config.Config, f flags
 			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)
--- a/internal/cli/serve/flags.go
+++ b/internal/cli/serve/flags.go
@ -1,236 +0,0 @@
 package serve
 import (
 	"fmt"
 	"net"
 	"sort"
 	"strconv"
 	"strings"
 	"github.com/spf13/pflag"
 	"github.com/tarampampam/error-pages/internal/env"
 	"github.com/tarampampam/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
 }
 const (
 	listenFlagName           = "listen"
 	portFlagName             = "port"
 	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"
 )
 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
 }
--- a/internal/cli/shared/flags.go
+++ b/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()},
 }
--- a/internal/cli/version/command.go
+++ b/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
 		},
 	}
 }
--- a/internal/cli/version/command_test.go
+++ b/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())
 }
--- a/internal/config/config_test.go
+++ b/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) {
--- a/internal/env/env.go
+++ b/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
--- a/internal/http/core/errorpage.go
+++ b/internal/http/core/errorpage.go
@ -3,10 +3,11 @@ package core
 import (
 	"strconv"
 	"github.com/tarampampam/error-pages/internal/config"
 	"github.com/tarampampam/error-pages/internal/options"
 	"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 {
--- a/internal/http/core/formats_test.go
+++ b/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) {
--- a/internal/http/handlers/errorpage/handler.go
+++ b/internal/http/handlers/errorpage/handler.go
@ -1,11 +1,12 @@
 package errorpage
 import (
 	"github.com/tarampampam/error-pages/internal/config"
 	"github.com/tarampampam/error-pages/internal/http/core"
 	"github.com/tarampampam/error-pages/internal/options"
 	"github.com/tarampampam/error-pages/internal/tpl"
 	"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 (
--- a/internal/http/handlers/index/handler.go
+++ b/internal/http/handlers/index/handler.go
@ -3,11 +3,12 @@ package index
 import (
 	"strconv"
 	"github.com/tarampampam/error-pages/internal/config"
 	"github.com/tarampampam/error-pages/internal/http/core"
 	"github.com/tarampampam/error-pages/internal/options"
 	"github.com/tarampampam/error-pages/internal/tpl"
 	"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 (
--- a/internal/http/handlers/notfound/handler.go
+++ b/internal/http/handlers/notfound/handler.go
@ -2,13 +2,27 @@ package notfound
 import (
 	"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
 	}
 	renderer interface {
 		Render(content []byte, props tpl.Properties) ([]byte, error)
 	}
 )
 // NewHandler creates handler missing requests handling.
-func NewHandler() fasthttp.RequestHandler {
+func NewHandler(cfg *config.Config, p templatePicker, rdr renderer, opt options.ErrorPage) fasthttp.RequestHandler {
 	return func(ctx *fasthttp.RequestCtx) {
-		ctx.SetContentType("text/plain; charset=utf-8")
+		core.RespondWithErrorPage(ctx, cfg, p, rdr, "404", fasthttp.StatusNotFound, opt)
 		ctx.SetStatusCode(fasthttp.StatusNotFound)
 		_, _ = ctx.WriteString("Wrong request URL. Error pages are available at the following URLs: /{code}.html")
 	}
 }
--- a/internal/http/server.go
+++ b/internal/http/server.go
@ -5,21 +5,22 @@ 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/options"
 	"github.com/tarampampam/error-pages/internal/tpl"
 	"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 {
@ -87,7 +88,7 @@ func (s *Server) Register(cfg *config.Config, templatePicker templatePicker, opt
 	s.router.GET("/metrics", metricsHandler.NewHandler(reg))
-	s.router.NotFound = notfoundHandler.NewHandler()
+	s.router.NotFound = notfoundHandler.NewHandler(cfg, templatePicker, s.rdr, opt)
 	return nil
 }
--- a/internal/logger/format.go
+++ b/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)
 }
--- a/internal/logger/format_test.go
+++ b/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())
 			}
 		})
 	}
 }
--- a/internal/logger/level.go
+++ b/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)
 }
--- a/internal/logger/level_test.go
+++ b/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())
 }
--- a/internal/logger/logger.go
+++ b/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.
+// New creates new "zap" logger with a small customization.
-func New(verbose, debug, logJSON bool) (*zap.Logger, error) {
+func New(l Level, f Format) (*zap.Logger, error) {
 	var config zap.Config
-	if logJSON {
+	switch f {
-		config = zap.NewProductionConfig()
+	case ConsoleFormat:
 	} else {
 		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 {
+	var zapLvl zapcore.Level
-		config.Level = zap.NewAtomicLevelAt(zap.DebugLevel)
+
 	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()
 }
--- a/internal/logger/logger_test.go
+++ b/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)
+		log, err := logger.New(logger.DebugLevel, logger.ConsoleFormat)
-		assert.NoError(t, err)
+		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)
+		log, err := logger.New(logger.ErrorLevel, logger.ConsoleFormat)
-		assert.NoError(t, err)
+		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")
 }
--- a/internal/metrics/metrics_test.go
+++ b/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) {
--- a/internal/metrics/registry_test.go
+++ b/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) {
--- a/internal/pick/picker_test.go
+++ b/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) {
--- a/internal/pick/strings_slice_test.go
+++ b/internal/pick/strings_slice_test.go
@ -5,7 +5,8 @@ import (
 	"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) {
--- a/internal/tpl/hasher_test.go
+++ b/internal/tpl/hasher_test.go
@ -4,7 +4,8 @@ import (
 	"testing"
 	"github.com/stretchr/testify/assert"
-	"github.com/tarampampam/error-pages/internal/tpl"
+
 	"gh.tarampamp.am/error-pages/internal/tpl"
 )
 func TestHashBytes(t *testing.T) {
--- a/internal/tpl/properties_test.go
+++ b/internal/tpl/properties_test.go
@ -4,7 +4,8 @@ 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) {
--- a/internal/tpl/render.go
+++ b/internal/tpl/render.go
@ -10,7 +10,8 @@ import (
 	"time"
 	"github.com/pkg/errors"
-	"github.com/tarampampam/error-pages/internal/version"
+
 	"gh.tarampamp.am/error-pages/internal/version"
 )
 // These functions are always allowed in the templates.
@ -30,6 +31,7 @@ var tplFnMap = template.FuncMap{ //nolint:gochecknoglobals
 		return 0
 	},
 	"env": os.Getenv,
 }
 var ErrClosed = errors.New("closed")
--- a/internal/tpl/render_test.go
+++ b/internal/tpl/render_test.go
@ -2,18 +2,25 @@ 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
@ -67,6 +74,11 @@ func Test_Render(t *testing.T) {
 			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 := renderer.Render([]byte(tt.giveContent), tt.giveProps)
--- a/templates/orient.html
+++ b/templates/orient.html
--- a/test/hurl/404.hurl
+++ b/test/hurl/404.hurl
@ -3,5 +3,5 @@ GET http://{{ host }}:{{ port }}/not-found
 HTTP/* 404
 [Asserts]
-header "Content-Type" contains "text/plain"
+header "Content-Type" contains "text/html"
-body contains "Wrong request URL"
+body contains "The server can not find the requested page"
Author	SHA1	Message	Date
Lars Gerber	940bd0405f	New template `orient` added (#190 ) * added orient theme * added creation test for orient theme * Added new Orient theme to CHANGELOG.md * fix: Template fixed a bit --------- Co-authored-by: Paramtamtam <7326800+tarampampam@users.noreply.github.com>	2023-04-17 15:06:28 +04:00
Pаramtamtаm	d40e8879d1	feat: Non-existing pages now return styled `404` status page (with `404` status code) (#189 ) * 🎨 style(CHANGELOG.md): add UNRELEASED section 🔧 chore(notfound/handler.go): refactor to use core.RespondWithErrorPage 🔧 chore(http/server.go): pass config, templatePicker, renderer and options to notfoundHandler 🔧 chore(hurl/404.hurl): update test to expect HTML response instead of plain text * 📝 docs(CHANGELOG.md): fix typo in changed section * 🔥 chore(CHANGELOG.md): release version 2.22.0 🔥 chore(flags.go): remove unused code for serve command	2023-04-07 14:42:00 +04:00
dependabot[bot]	6a67510bdc	build(deps): bump go.uber.org/automaxprocs from 1.5.1 to 1.5.2 (#183 )	2023-04-02 02:27:23 +00:00
dependabot[bot]	a79521a37d	build(deps): bump github.com/urfave/cli/v2 from 2.24.4 to 2.25.1 (#185 )	2023-04-02 02:24:01 +00:00
dependabot[bot]	4667194271	build(deps): bump github.com/fasthttp/router from 1.4.17 to 1.4.18 (#184 )	2023-04-02 02:23:55 +00:00
dependabot[bot]	a20852b03a	build(deps): bump aquasecurity/trivy-action from 0.9.1 to 0.9.2 (#182 )	2023-04-02 02:22:48 +00:00
dependabot[bot]	ec0f1cc0d3	build(deps): bump github.com/valyala/fasthttp from 1.44.0 to 1.45.0 (#186 )	2023-04-02 02:19:54 +00:00
dependabot[bot]	49d9650d35	build(deps): bump github.com/fatih/color from 1.14.1 to 1.15.0 (#187 )	2023-04-02 02:19:27 +00:00
renovate[bot]	1b876c45cc	chore(deps): update golangci/golangci-lint docker tag to v1.52 (#181 ) Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>	2023-03-18 17:17:13 +04:00
dependabot[bot]	23f52f25e2	Bump aquasecurity/trivy-action from 0.8.0 to 0.9.1 (#177 )	2023-03-02 03:53:22 +00:00
dependabot[bot]	16d7d80183	Bump github.com/stretchr/testify from 1.8.1 to 1.8.2 (#178 )	2023-03-02 03:49:08 +00:00
dependabot[bot]	5389fe00dd	Bump github.com/fasthttp/router from 1.4.16 to 1.4.17 (#179 )	2023-03-02 03:48:51 +00:00
dependabot[bot]	cd67674976	Bump go.uber.org/goleak from 1.2.0 to 1.2.1 (#180 )	2023-03-02 03:48:33 +00:00
Paramtamtam	36673a49a4	ci: 👷 CI system updated	2023-02-23 22:03:32 +04:00
Paramtamtam	b84b3ba9f4	chore: 🔧 Changes that do not modify src or test files	2023-02-23 21:50:35 +04:00
Paramtamtam	5343d8c934	docs(changelog): 📚 Changelog file updated	2023-02-23 21:50:31 +04:00
Paramtamtam	80891b0b46	ci: 👷 CI system updated	2023-02-23 21:50:20 +04:00
Paramtamtam	48313685ec	chore: Module name changed, deps updated	2023-02-23 21:49:45 +04:00
renovate[bot]	7dc47c00ac	chore(deps): update golangci/golangci-lint docker tag to v1.51 (#174 ) Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>	2023-02-02 17:08:43 +04:00
renovate[bot]	830b5bb934	chore(deps): update golang docker tag to v1.20 (#173 ) * chore(deps): update golang docker tag to v1.20 * updated * update * update * Update .github/workflows/tests.yml --------- Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com> Co-authored-by: Paramtamtam <7326800+tarampampam@users.noreply.github.com>	2023-02-02 13:09:29 +04:00
dependabot[bot]	8d43984644	Bump github.com/urfave/cli/v2 from 2.24.1 to 2.24.2 (#168 )	2023-02-02 07:25:44 +00:00
dependabot[bot]	1b152c1a80	Bump github.com/fasthttp/router from 1.4.14 to 1.4.16 (#169 )	2023-02-02 03:26:30 +00:00
dependabot[bot]	175b9f0cfb	Bump go.uber.org/goleak from 1.1.11 to 1.2.0 (#170 )	2023-02-02 03:25:57 +00:00
dependabot[bot]	16180be7e2	Bump github.com/valyala/fasthttp from 1.43.0 to 1.44.0 (#171 )	2023-02-02 03:22:36 +00:00
dependabot[bot]	11b270ee68	Bump github.com/fatih/color from 1.13.0 to 1.14.1 (#172 )	2023-02-02 03:22:15 +00:00
dependabot[bot]	97ab8a4475	Bump docker/build-push-action from 3 to 4 (#167 )	2023-02-02 03:20:00 +00:00
Paramtamtam	da3b864e02	fix: docker-compose server running command	2023-01-29 15:56:58 +04:00
Paramtamtam	0bd989e493	docs(changelog): file updated	2023-01-29 15:49:28 +04:00
Paramtamtam	59c4d2022c	ci: workflow files have been updated	2023-01-29 15:39:49 +04:00
Paramtamtam	1ec17caa1d	feat: Possibility to use custom env variables in templates (#165 )	2023-01-29 15:25:38 +04:00
Paramtamtam	252618a975	chore: Better CLI (#163 )	2023-01-29 14:54:56 +04:00
Paramtamtam	315c7660d1	Update README.md	2022-12-27 11:41:51 +04:00
dependabot[bot]	6a6809b07f	Bump go.uber.org/zap from 1.23.0 to 1.24.0 (#159 )	2022-12-02 06:09:55 +00:00
dependabot[bot]	a960b5928e	Bump github.com/valyala/fasthttp from 1.41.0 to 1.43.0 (#157 )	2022-12-02 06:06:16 +00:00
dependabot[bot]	46d96d7bb4	Bump github.com/prometheus/client_golang from 1.13.0 to 1.14.0 (#160 )	2022-12-02 06:02:10 +00:00
dependabot[bot]	69063a9cf7	Bump github.com/fasthttp/router from 1.4.13 to 1.4.14 (#158 )	2022-12-02 06:01:28 +00:00
renovate[bot]	7c8d2f54c7	Update orangeopensource/hurl Docker tag to v1.8.0 (#155 ) * Update orangeopensource/hurl Docker tag to v1.8.0 * wip: temporary commit Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com> Co-authored-by: Paramtamtam <7326800+tarampampam@users.noreply.github.com>	2022-11-18 23:46:46 +04:00
Paramtamtam	49aed23f8c	Update README.md	2022-11-15 13:06:39 +04:00