docs(changelog): file updated

ci: workflow files have been updated
feat: Possibility to use custom env variables in templates (#165 )
2024-08-30 18:22:40 +00:00 · 2023-01-29 15:49:28 +04:00 · 2023-01-29 15:39:49 +04:00 · 2023-01-29 15:25:38 +04:00 · 2023-01-29 14:54:56 +04:00 · 2022-12-27 11:41:51 +04:00
39 changed files with 1211 additions and 802 deletions
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@ -27,7 +27,7 @@ jobs:
        arch: [amd64]  # amd64, 386
    steps:
      - uses: actions/setup-go@v3
-        with: {go-version: 1.18}
+        with: {go-version: 1.19}

      - uses: actions/checkout@v3

--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@ -29,7 +29,11 @@ jobs: # Docs: <https://git.io/JvxXE>
    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
@ -67,7 +71,7 @@ jobs: # Docs: <https://git.io/JvxXE>
    runs-on: ubuntu-20.04
    steps:
      - uses: actions/setup-go@v3
-        with: {go-version: 1.18}
+        with: {go-version: 1.19}

      - uses: actions/checkout@v3
        with: {fetch-depth: 2} # Fixes codecov error 'Issue detecting commit SHA'
@ -103,7 +107,7 @@ jobs: # Docs: <https://git.io/JvxXE>
    needs: [golangci-lint, go-test, validate-config-file]
    steps:
      - uses: actions/setup-go@v3
-        with: {go-version: 1.18}
+        with: {go-version: 1.19}

      - uses: actions/checkout@v3

@ -129,7 +133,7 @@ jobs: # Docs: <https://git.io/JvxXE>

      - 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:
@ -155,7 +159,7 @@ 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: |
@ -210,7 +214,7 @@ jobs: # Docs: <https://git.io/JvxXE>
          name: docker-image
          path: .artifact

-      - uses: aquasecurity/trivy-action@0.6.1 # action page: <https://github.com/aquasecurity/trivy-action>
+      - uses: aquasecurity/trivy-action@0.8.0 # action page: <https://github.com/aquasecurity/trivy-action>
        with:
          input: .artifact/docker-image.tar
          format: sarif
@ -247,7 +251,7 @@ 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/.golangci.yml
+++ b/.golangci.yml
@ -43,7 +43,6 @@ linters: # All available linters list: <https://golangci-lint.run/usage/linters/
  enable:
    - asciicheck # Simple linter to check that your code does not contain non-ASCII identifiers
    - bidichk # Checks for dangerous unicode character sequences
-    - deadcode # Finds unused code
    - depguard # Go linter that checks if package imports are in a list of acceptable packages
    - dogsled # Checks assignments with too many blank identifiers (e.g. x, _, _, _, := f())
    - dupl # Tool for code clone detection
@ -78,7 +77,6 @@ linters: # All available linters list: <https://golangci-lint.run/usage/linters/
    - typecheck # Like the front-end of a Go compiler, parses and type-checks Go code
    - unconvert # Remove unnecessary type conversions
    - unused # Checks Go code for unused constants, variables, functions and types
-    - varcheck # Finds unused global variables and constants
    - whitespace # Tool for detection of leading and trailing whitespace
    - wsl # Whitespace Linter - Forces you to use empty lines!

--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@ -4,6 +4,34 @@ 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].

+## v2.20.0
+
+### Changed
+
+- `version` subcommand replaced by `--version` flag [#163]
+- `--config-file` flag is not global anymore (use `error-pages (serve|build) --config-file ...` instead of `error-pages --config-file ... (serve|build) ...`) [#163]
+- Flags `--verbose`, `--debug` and `--log-json` are deprecated, use `--log-level` and `--log-format` instead [#163]
+
+### Added
+
+- Possibility to use custom env variables in templates [#164], [#165]
+
+[#164]:https://github.com/tarampampam/error-pages/issues/164
+[#165]:https://github.com/tarampampam/error-pages/pull/165
+[#163]:https://github.com/tarampampam/error-pages/pull/163
+
+## v2.19.0
+
+### Changed
+
+- Go updated from `1.18` up to `1.19`
+
+### Added
+
+- Error pages now translated into Chinese 🇨🇳 [#147]
+
+[#147]:https://github.com/tarampampam/error-pages/pull/147
+
 ## v2.18.0

 ### Changed
--- a/10
+++ b/10
@ -1,7 +1,7 @@
 # syntax=docker/dockerfile:1.2

 # Image page: <https://hub.docker.com/_/golang>
-FROM golang:1.18-alpine as builder
+FROM golang:1.19-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"
@ -16,7 +16,7 @@ ENV LDFLAGS="-s -w -X github.com/tarampampam/error-pages/internal/version.versio
 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/2
+++ b/2
@ -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/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/tests.yml?branch=master&maxAge=30&label=tests&logo=github&style=flat-square" alt="" /></a>
+  <a href="https://github.com/tarampampam/error-pages/actions"><img src="https://img.shields.io/github/actions/workflow/status/tarampampam/error-pages/release.yml?maxAge=30&label=release&logo=github&style=flat-square" alt="" /></a>
  <a href="https://hub.docker.com/r/tarampampam/error-pages"><img src="https://img.shields.io/docker/pulls/tarampampam/error-pages.svg?maxAge=30&label=pulls&logo=docker&logoColor=white&style=flat-square" alt="" /></a>
  <a href="https://hub.docker.com/r/tarampampam/error-pages"><img src="https://img.shields.io/docker/image-size/tarampampam/error-pages/latest?maxAge=30&label=size&logo=docker&logoColor=white&style=flat-square" alt="" /></a>
  <a href="https://github.com/tarampampam/error-pages/blob/master/LICENSE"><img src="https://img.shields.io/github/license/tarampampam/error-pages.svg?maxAge=30&style=flat-square" alt="" /></a>
@ -34,14 +34,12 @@ One day you may want to replace the standard error pages of your HTTP server wit
 - Error pages can be [embedded into your own `nginx`][wiki-usage-with-nginx] docker image
 - Fully configurable (take a look at the [configuration file](https://github.com/tarampampam/error-pages/blob/master/error-pages.yml) and [project Wiki][wiki])
 - Distributed using docker image and compiled binary files
- Localized (🇺🇸, 🇫🇷, 🇺🇦, 🇷🇺, 🇵🇹, 🇳🇱, 🇩🇪, 🇪🇸) HTML error pages (translation process [described here](https://github.com/tarampampam/error-pages/tree/master/l10n) - other translations are welcome!)
+- Localized (🇺🇸, 🇫🇷, 🇺🇦, 🇷🇺, 🇵🇹, 🇳🇱, 🇩🇪, 🇪🇸, 🇨🇳) HTML error pages (translation process [described here](https://github.com/tarampampam/error-pages/tree/master/l10n) - other translations are welcome!)

 ## 🧩 Install

 Download the latest binary file for your os/arch from the [releases page][releases] or use our docker image:

-[![image stats](https://dockeri.co/image/tarampampam/error-pages)][docker-hub-tags]
-
 | Registry                          | Image                             |
 |-----------------------------------|-----------------------------------|
 | [Docker Hub][docker-hub]          | `tarampampam/error-pages`         |
--- a/cmd/error-pages/main.go
+++ b/cmd/error-pages/main.go
@ -1,13 +1,22 @@
 package main

 import (
+	crypto "crypto/rand"
+	"encoding/binary"
+	"math/rand"
 	"os"
 	"path/filepath"
+	"time"

 	"github.com/fatih/color"
+	"go.uber.org/automaxprocs/maxprocs"
+
 	"github.com/tarampampam/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 +26,16 @@ 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]))
+	var b [8]byte

-	if err := cmd.Execute(); err != nil {
+	// seed random number generator
+	if _, err := crypto.Read(b[:]); err == nil {
+		rand.Seed(int64(binary.LittleEndian.Uint64(b[:]))) // https://stackoverflow.com/a/54491783/2252921
+	} else {
+		rand.Seed(time.Now().UnixNano()) // fallback
+	}
+
+	if err := (cli.NewApp(filepath.Base(os.Args[0]))).Run(os.Args); err != nil {
 		_, _ = color.New(color.FgHiRed, color.Bold).Fprintln(os.Stderr, err.Error())

 		return 1
--- 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, "Available Commands:")
-	assert.Contains(t, output, "Flags:")
-}
-
-func Test_MainWithoutCommands(t *testing.T) {
-	os.Args = []string{""}
-	exitFn = func(code int) { assert.Equal(t, 0, code) }
-
-	output := capturer.CaptureStdout(main)
-
-	assert.Contains(t, output, "Usage:")
-	assert.Contains(t, output, "Available Commands:")
-	assert.Contains(t, output, "Flags:")
-}
-
-func Test_MainUnknownSubcommand(t *testing.T) {
-	os.Args = []string{"", "foobar"}
-	exitFn = func(code int) { assert.Equal(t, 1, code) }
-
-	output := capturer.CaptureStderr(main)
-
-	assert.Contains(t, output, "unknown command")
-	assert.Contains(t, output, "foobar")
+	assert.Contains(t, output, "USAGE:")
+	assert.Contains(t, output, "COMMANDS:")
+	assert.Contains(t, output, "GLOBAL OPTIONS:")
 }
--- a/docker-compose.yml
+++ b/docker-compose.yml
@ -8,7 +8,7 @@ volumes:

 services:
  app: &app-service
-    image: golang:1.18-buster # Image page: <https://hub.docker.com/_/golang>
+    image: golang:1.19-buster # Image page: <https://hub.docker.com/_/golang>
    working_dir: /src
    environment:
      HOME: /tmp
@ -31,7 +31,7 @@ services:
      start_period: 5s

  golint:
-    image: golangci/golangci-lint:v1.48-alpine # Image page: <https://hub.docker.com/r/golangci/golangci-lint>
+    image: golangci/golangci-lint:v1.50-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:
@ -41,7 +41,7 @@ services:
    command: /bin/true

  hurl:
-    image: orangeopensource/hurl:1.6.1
+    image: orangeopensource/hurl:1.8.0
    volumes:
      - .:/src:ro
    working_dir: /src
--- a/go.mod
+++ b/go.mod
@ -1,20 +1,21 @@
 module github.com/tarampampam/error-pages

-go 1.18
+go 1.19

 require (
 	github.com/a8m/envsubst v1.3.0
-	github.com/fasthttp/router v1.4.11
+	github.com/fasthttp/router v1.4.14
 	github.com/fatih/color v1.13.0
 	github.com/kami-zh/go-capturer v0.0.0-20171211120116-e492ea43421d
 	github.com/pkg/errors v0.9.1
-	github.com/prometheus/client_golang v1.12.2
-	github.com/prometheus/client_model v0.2.0
-	github.com/spf13/cobra v1.5.0
-	github.com/spf13/pflag v1.0.5
-	github.com/stretchr/testify v1.8.0
-	github.com/valyala/fasthttp v1.38.0
-	go.uber.org/zap v1.21.0
+	github.com/prometheus/client_golang v1.14.0
+	github.com/prometheus/client_model v0.3.0
+	github.com/stretchr/testify v1.8.1
+	github.com/urfave/cli/v2 v2.24.1
+	github.com/valyala/fasthttp v1.43.0
+	go.uber.org/automaxprocs v1.5.1
+	go.uber.org/goleak v1.1.11
+	go.uber.org/zap v1.24.0
 	gopkg.in/yaml.v3 v3.0.1
 )

@ -22,20 +23,22 @@ require (
 	github.com/andybalholm/brotli v1.0.4 // indirect
 	github.com/beorn7/perks v1.0.1 // indirect
 	github.com/cespare/xxhash/v2 v2.1.2 // indirect
+	github.com/cpuguy83/go-md2man/v2 v2.0.2 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/golang/protobuf v1.5.2 // indirect
-	github.com/inconshreveable/mousetrap v1.0.0 // indirect
-	github.com/klauspost/compress v1.15.0 // indirect
+	github.com/klauspost/compress v1.15.9 // indirect
 	github.com/mattn/go-colorable v0.1.12 // indirect
 	github.com/mattn/go-isatty v0.0.14 // indirect
 	github.com/matttproud/golang_protobuf_extensions v1.0.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/prometheus/common v0.32.1 // indirect
-	github.com/prometheus/procfs v0.7.3 // indirect
+	github.com/prometheus/common v0.37.0 // indirect
+	github.com/prometheus/procfs v0.8.0 // indirect
+	github.com/russross/blackfriday/v2 v2.1.0 // indirect
 	github.com/savsgio/gotils v0.0.0-20220530130905-52f3993e8d6d // indirect
 	github.com/valyala/bytebufferpool v1.0.0 // indirect
+	github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673 // indirect
 	go.uber.org/atomic v1.7.0 // indirect
 	go.uber.org/multierr v1.6.0 // indirect
-	golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f // indirect
-	google.golang.org/protobuf v1.27.1 // indirect
+	golang.org/x/sys v0.0.0-20220728004956-3c1f35247d10 // indirect
+	google.golang.org/protobuf v1.28.1 // indirect
 )
--- a/go.sum
+++ b/go.sum
@ -43,7 +43,6 @@ github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk5
 github.com/andybalholm/brotli v1.0.4 h1:V7DdXeJtZscaqfNuAdSRuRFzuiKlHSC/Zh3zl9qY3JY=
 github.com/andybalholm/brotli v1.0.4/go.mod h1:fO7iG3H7G2nSZ7m0zPUDn85XEX2GTukHGRSepvi9Eig=
 github.com/benbjohnson/clock v1.1.0 h1:Q92kusRqC1XV2MjkWETPvjJVqKetz1OzxZB7mHJLju8=
-github.com/benbjohnson/clock v1.1.0/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA=
 github.com/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=
@ -57,6 +56,7 @@ github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5P
 github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
 github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
+github.com/cpuguy83/go-md2man/v2 v2.0.2 h1:p1EgwI/C7NhT0JmVkwCD2ZBK8j4aeHQX2pMHHBfMQ6w=
 github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
@ -65,8 +65,8 @@ github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymF
 github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
 github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
-github.com/fasthttp/router v1.4.11 h1:99BvgVxeS2oOZBHnKr/okpdPq1jkn8WvYA2trh/71LY=
-github.com/fasthttp/router v1.4.11/go.mod h1:luEEYkGBSAmYyPaMeIUGNgqY+FdHHYDOK9Kivaw7aNo=
+github.com/fasthttp/router v1.4.14 h1:+W65VCKgyI4BZszhDiCRfONoFieePZIoQ7D8vGhiuzM=
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@ -75,9 +75,11 @@ github.com/go-gl/glfw/v3.3/glfw v0.0.0-20200222043503-6f7a984d4dc4/go.mod h1:tQ2
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@ -118,8 +120,8 @@ github.com/google/go-cmp v0.4.1/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/
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@ -137,8 +139,6 @@ github.com/googleapis/gax-go/v2 v2.0.5/go.mod h1:DWXyrwAJ9X0FpwwEdw+IPEYBICEFu5m
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@ -151,8 +151,8 @@ github.com/julienschmidt/httprouter v1.3.0/go.mod h1:JR6WtHb+2LUe8TCKY3cZOxFyyO8
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@ -182,54 +182,63 @@ github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
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@ -241,12 +250,14 @@ go.opencensus.io v0.22.3/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
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+go.uber.org/zap v1.24.0 h1:FiJd5l1UOLj0wCgbSE0rwwXHzEdAZS6hiiSnxJN/D60=
+go.uber.org/zap v1.24.0/go.mod h1:2kMP+WWQ8aoFoedH3T2sq6iJ2yDWpHbP0f6MQbS9Gkg=
 golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20190510104115-cbcb75029529/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
@ -275,6 +286,7 @@ golang.org/x/lint v0.0.0-20190909230951-414d861bb4ac/go.mod h1:6SW0HCj/g11FgYtHl
 golang.org/x/lint v0.0.0-20190930215403-16217165b5de/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
 golang.org/x/lint v0.0.0-20191125180803-fdd1cda4f05f/go.mod h1:5qLYkcX4OjUUV8bRuDixDT3tpyyb+LUpUlRWLxfhWrs=
 golang.org/x/lint v0.0.0-20200130185559-910be7a94367/go.mod h1:3xt1FjdF8hUf6vQPIChWIBhFzV8gjjsPE/fR3IyQdNY=
+golang.org/x/lint v0.0.0-20200302205851-738671d3881b h1:Wh+f8QHJXR411sJR8/vRBTZ7YapZaRvUcLFFJhusH0k=
 golang.org/x/lint v0.0.0-20200302205851-738671d3881b/go.mod h1:3xt1FjdF8hUf6vQPIChWIBhFzV8gjjsPE/fR3IyQdNY=
 golang.org/x/mobile v0.0.0-20190312151609-d3739f865fa6/go.mod h1:z+o9i4GpDbdi3rU15maQ/Ox0txvL9dWGYEHz965HBQE=
 golang.org/x/mobile v0.0.0-20190719004257-d2bd2a29d028/go.mod h1:E/iHnbuqvinMTCcRqshq8CkpyQDoeVncDDYHnLhea+o=
@ -316,13 +328,16 @@ golang.org/x/net v0.0.0-20200822124328-c89045814202/go.mod h1:/O7V0waA8r7cgGh81R
 golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM=
 golang.org/x/net v0.0.0-20210525063256-abc453219eb5/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/net v0.0.0-20211112202133-69e39bad7dc2/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
+golang.org/x/net v0.0.0-20220127200216-cd36cc0744dd/go.mod h1:CfG3xpIq0wQ8r1q4Su4UZFWDARRcnwPjda9FqA0JpMk=
 golang.org/x/net v0.0.0-20220225172249-27dd8689420f/go.mod h1:CfG3xpIq0wQ8r1q4Su4UZFWDARRcnwPjda9FqA0JpMk=
+golang.org/x/net v0.0.0-20220906165146-f3363e06e74c/go.mod h1:YDH+HFinaLZZlnHAfSS6ZXJJ9M9t4Dl22yv3iI2vPwk=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/oauth2 v0.0.0-20191202225959-858c2ad4c8b6/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/oauth2 v0.0.0-20210514164344-f6687ab2804c/go.mod h1:KelEdhl1UZF7XfJ4dDtk6s++YSgaE7mD/BuKKDLBl4A=
+golang.org/x/oauth2 v0.0.0-20220223155221-ee480838109b/go.mod h1:DAh4E804XQdzx2j+YRIaUnCqCV2RuMz24cGBJ5QYIrc=
 golang.org/x/sync v0.0.0-20180314180146-1d60e4601c6f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20181108010431-42b317875d0f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
@ -376,9 +391,8 @@ golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20210927094055-39ccf1dd6fa6/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211216021012-1d35b9e2eb4e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220114195835-da31bd327af9/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20220227234510-4e6760a101f9/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f h1:v4INt8xihDGvnrfjMDVXGxw9wrfxYyCjk0KbXjhR55s=
-golang.org/x/sys v0.0.0-20220722155257-8c9f86f7a55f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220728004956-3c1f35247d10 h1:WIoqL4EROvwiPdUtaip4VcDdpZ4kha7wBWZrbVKCIZg=
+golang.org/x/sys v0.0.0-20220728004956-3c1f35247d10/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
 golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
@ -431,11 +445,11 @@ golang.org/x/tools v0.0.0-20200618134242-20370b0cb4b2/go.mod h1:EkVYQZoAsY45+roY
 golang.org/x/tools v0.0.0-20200729194436-6467de6f59a7/go.mod h1:njjCfa9FT2d7l9Bc6FUM5FLjQPp3cFF28FI3qnDFljA=
 golang.org/x/tools v0.0.0-20200804011535-6c149bb5ef0d/go.mod h1:njjCfa9FT2d7l9Bc6FUM5FLjQPp3cFF28FI3qnDFljA=
 golang.org/x/tools v0.0.0-20200825202427-b303f430e36d/go.mod h1:njjCfa9FT2d7l9Bc6FUM5FLjQPp3cFF28FI3qnDFljA=
+golang.org/x/tools v0.1.5 h1:ouewzE6p+/VEB31YYnTbEJdi8pFqKp4P4n85vwo3DHA=
 golang.org/x/tools v0.1.5/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/api v0.4.0/go.mod h1:8k5glujaEP+g9n7WNsDg8QP6cUVNI86fCNMcbazEtwE=
 google.golang.org/api v0.7.0/go.mod h1:WtwebWUNSVBH/HAw79HIFXZNqEvBhG+Ra+ax0hx3E3M=
@ -512,8 +526,8 @@ google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGj
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
 google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
-google.golang.org/protobuf v1.27.1 h1:SnqbnDw1V7RiZcXPx5MEeqPv2s79L9i7BJUlG/+RurQ=
-google.golang.org/protobuf v1.27.1/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
+google.golang.org/protobuf v1.28.1 h1:d0NfwRgPtno5B1Wa6L2DAG+KivqkdutMf1UhdNx175w=
+google.golang.org/protobuf v1.28.1/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
@ -524,12 +538,9 @@ gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
-gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
--- a/internal/checkers/health_test.go
+++ b/internal/checkers/health_test.go
@ -3,11 +3,12 @@ package checkers_test
 import (
 	"bytes"
 	"context"
-	"io/ioutil"
+	"io"
 	"net/http"
 	"testing"

 	"github.com/stretchr/testify/assert"
+
 	"github.com/tarampampam/error-pages/internal/checkers"
 )

@ -22,7 +23,7 @@ func TestHealthChecker_CheckSuccess(t *testing.T) {
 		assert.Equal(t, "HealthChecker/internal", req.Header.Get("User-Agent"))

 		return &http.Response{
-			Body:       ioutil.NopCloser(bytes.NewReader([]byte{})),
+			Body:       io.NopCloser(bytes.NewReader([]byte{})),
 			StatusCode: http.StatusOK,
 		}, nil
 	}
@ -35,7 +36,7 @@ func TestHealthChecker_CheckSuccess(t *testing.T) {
 func TestHealthChecker_CheckFail(t *testing.T) {
 	var httpMock httpClientFunc = func(req *http.Request) (*http.Response, error) {
 		return &http.Response{
-			Body:       ioutil.NopCloser(bytes.NewReader([]byte{})),
+			Body:       io.NopCloser(bytes.NewReader([]byte{})),
 			StatusCode: http.StatusBadGateway,
 		}, nil
 	}
--- 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"
+
+	"github.com/tarampampam/error-pages/internal/checkers"
+	"github.com/tarampampam/error-pages/internal/cli/build"
+	"github.com/tarampampam/error-pages/internal/cli/healthcheck"
+	"github.com/tarampampam/error-pages/internal/cli/serve"
+	"github.com/tarampampam/error-pages/internal/env"
+	"github.com/tarampampam/error-pages/internal/logger"
+	"github.com/tarampampam/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"
+
+	"github.com/tarampampam/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"
+	"go.uber.org/zap"
+
+	"github.com/tarampampam/error-pages/internal/cli/shared"
 	"github.com/tarampampam/error-pages/internal/config"
 	"github.com/tarampampam/error-pages/internal/tpl"
-	"go.uber.org/zap"
 )

+type command struct {
+	c *cli.Command
+}
+
 // NewCommand creates `build` command.
-func NewCommand(log *zap.Logger, configFile *string) *cobra.Command {
-	var (
-		generateIndex bool
-		disableL10n   bool
-		cfg           *config.Config
+func NewCommand(log *zap.Logger) *cli.Command {
+	var cmd = command{}
+
+	const (
+		generateIndexFlagName = "index"
+		disableL10nFlagName   = "disable-l10n"
 	)

-	cmd := &cobra.Command{
-		Use:     "build <output-directory>",
-		Aliases: []string{"b"},
-		Short:   "Build the error pages",
-		Args:    cobra.ExactArgs(1),
-		PreRunE: func(*cobra.Command, []string) (err error) {
-			if configFile == nil {
-				return errors.New("path to the config file is required for this command")
+	cmd.c = &cli.Command{
+		Name:        "build",
+		Aliases:     []string{"b"},
+		Usage:       "build <output-directory>",
+		Description: "Build the error pages",
+		Action: func(c *cli.Context) error {
+			cfg, cfgErr := config.FromYamlFile(c.String(shared.ConfigFileFlag.Name))
+			if cfgErr != nil {
+				return cfgErr
 			}

-			if cfg, err = config.FromYamlFile(*configFile); err != nil {
-				return err
-			}
-
-			return
-		},
-		RunE: func(_ *cobra.Command, args []string) error {
-			if len(args) != 1 {
+			if c.Args().Len() != 1 {
 				return errors.New("wrong arguments count")
 			}

-			return run(log, cfg, args[0], generateIndex, 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(
-		&generateIndex,
-		"index", "i",
-		false,
-		"generate index page",
-	)
-
-	cmd.Flags().BoolVarP(
-		&disableL10n,
-		"disable-l10n", "",
-		false,
-		"disable error pages localization",
-	)
-
-	return cmd
+	return cmd.c
 }

 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) {
-	t.Skip("tests for this package have not been implemented yet")
+	"github.com/stretchr/testify/assert"
+	"github.com/urfave/cli/v2"
+	"go.uber.org/goleak"
+	"go.uber.org/zap"
+
+	"github.com/tarampampam/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/healthcheck/command.go
+++ b/internal/cli/healthcheck/command.go
@ -2,56 +2,35 @@
 package healthcheck

 import (
-	"fmt"
-	"strconv"
+	"errors"
+	"math"

-	"github.com/spf13/cobra"
-	"github.com/spf13/pflag"
-	"github.com/tarampampam/error-pages/internal/env"
+	"github.com/urfave/cli/v2"
+
+	"github.com/tarampampam/error-pages/internal/cli/shared"
 )

 type checker interface {
 	Check(port uint16) error
 }

-const portFlagName = "port"
-
 // NewCommand creates `healthcheck` command.
-func NewCommand(checker checker) *cobra.Command {
-	var port uint16
-
-	cmd := &cobra.Command{
-		Use:     "healthcheck",
+func NewCommand(checker checker) *cli.Command {
+	return &cli.Command{
+		Name:    "healthcheck",
 		Aliases: []string{"chk", "health", "check"},
-		Short:   "Health checker for the HTTP server. Use case - docker healthcheck",
-		PreRunE: func(c *cobra.Command, _ []string) (lastErr error) {
-			c.Flags().VisitAll(func(flag *pflag.Flag) {
-				// flag was NOT defined using CLI (flags should have maximal priority)
-				if !flag.Changed && flag.Name == portFlagName {
-					if envPort, exists := env.ListenPort.Lookup(); exists && envPort != "" {
-						if p, err := strconv.ParseUint(envPort, 10, 16); err == nil { //nolint:gomnd
-							port = uint16(p)
-						} else {
-							lastErr = fmt.Errorf("wrong TCP port environment variable [%s] value", envPort)
-						}
-					}
-				}
-			})
+		Usage:   "Health checker for the HTTP server. Use case - docker healthcheck",
+		Action: func(c *cli.Context) error {
+			var port = c.Uint(shared.ListenPortFlag.Name)

-			return lastErr
+			if port <= 0 || port > math.MaxUint16 {
+				return errors.New("port value out of range")
+			}
+
+			return checker.Check(uint16(port))
 		},
-		RunE: func(*cobra.Command, []string) error {
-			return checker.Check(port)
+		Flags: []cli.Flag{
+			shared.ListenPortFlag,
 		},
 	}
-
-	cmd.Flags().Uint16VarP(
-		&port,
-		portFlagName,
-		"p",
-		8080, //nolint:gomnd // must be same as default serve `--port` flag value
-		fmt.Sprintf("TCP port number [$%s]", env.ListenPort),
-	)
-
-	return cmd
 }
--- a/internal/cli/healthcheck/command_test.go
+++ b/internal/cli/healthcheck/command_test.go
@ -2,12 +2,12 @@ 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/urfave/cli/v2"
+
 	"github.com/tarampampam/error-pages/internal/cli/healthcheck"
 )

@ -18,77 +18,30 @@ func (c *fakeChecker) Check(port uint16) error { return c.err }
 func TestProperties(t *testing.T) {
 	cmd := healthcheck.NewCommand(&fakeChecker{err: nil})

-	assert.Equal(t, "healthcheck", cmd.Use)
+	assert.Equal(t, "healthcheck", cmd.Name)
 	assert.ElementsMatch(t, []string{"chk", "health", "check"}, cmd.Aliases)
-	assert.NotNil(t, cmd.RunE)
+	assert.NotNil(t, cmd.Action)
 }

 func TestCommandRun(t *testing.T) {
 	cmd := healthcheck.NewCommand(&fakeChecker{err: nil})
-	cmd.SetArgs([]string{})

-	output := capturer.CaptureOutput(func() {
-		assert.NoError(t, cmd.Execute())
-	})
-
-	assert.Empty(t, output)
+	assert.NoError(t, cmd.Run(cli.NewContext(cli.NewApp(), &flag.FlagSet{}, nil)))
 }

 func TestCommandRunFailed(t *testing.T) {
 	cmd := healthcheck.NewCommand(&fakeChecker{err: errors.New("foo err")})
-	cmd.SetArgs([]string{})

-	output := capturer.CaptureStderr(func() {
-		assert.Error(t, cmd.Execute())
-	})
-
-	assert.Contains(t, output, "foo err")
+	assert.ErrorContains(t, cmd.Run(cli.NewContext(cli.NewApp(), &flag.FlagSet{}, nil)), "foo err")
 }

 func TestPortFlagWrongArgument(t *testing.T) {
 	cmd := healthcheck.NewCommand(&fakeChecker{err: nil})
-	cmd.SetArgs([]string{"-p", "65536"}) // 65535 is max

-	var executed bool
+	err := cmd.Run(
+		cli.NewContext(cli.NewApp(), &flag.FlagSet{}, nil),
+		"", "-p", "65536",
+	)

-	cmd.RunE = func(*cobra.Command, []string) error {
-		executed = true
-
-		return nil
-	}
-
-	output := capturer.CaptureStderr(func() {
-		assert.Error(t, cmd.Execute())
-	})
-
-	assert.Contains(t, output, "invalid argument")
-	assert.Contains(t, output, "65536")
-	assert.Contains(t, output, "value out of range")
-	assert.False(t, executed)
-}
-
-func TestPortFlagWrongEnvValue(t *testing.T) {
-	cmd := healthcheck.NewCommand(&fakeChecker{err: nil})
-	cmd.SetArgs([]string{})
-
-	assert.NoError(t, os.Setenv("LISTEN_PORT", "65536")) // 65535 is max
-
-	defer func() { assert.NoError(t, os.Unsetenv("LISTEN_PORT")) }()
-
-	var executed bool
-
-	cmd.RunE = func(*cobra.Command, []string) error {
-		executed = true
-
-		return nil
-	}
-
-	output := capturer.CaptureStderr(func() {
-		assert.Error(t, cmd.Execute())
-	})
-
-	assert.Contains(t, output, "wrong TCP port")
-	assert.Contains(t, output, "environment variable")
-	assert.Contains(t, output, "65536")
-	assert.False(t, executed)
+	assert.ErrorContains(t, err, "port value out of range")
 }
--- 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/tarampampam/error-pages/internal/breaker"
-	"github.com/tarampampam/error-pages/internal/config"
-	appHttp "github.com/tarampampam/error-pages/internal/http"
-	"github.com/tarampampam/error-pages/internal/pick"
+	"github.com/urfave/cli/v2"
 	"go.uber.org/zap"
+
+	"github.com/tarampampam/error-pages/internal/breaker"
+	"github.com/tarampampam/error-pages/internal/cli/shared"
+	"github.com/tarampampam/error-pages/internal/config"
+	"github.com/tarampampam/error-pages/internal/env"
+	appHttp "github.com/tarampampam/error-pages/internal/http"
+	"github.com/tarampampam/error-pages/internal/options"
+	"github.com/tarampampam/error-pages/internal/pick"
+)
+
+type command struct {
+	c *cli.Command
+}
+
+const (
+	templateNameFlagName     = "template-name"
+	defaultErrorPageFlagName = "default-error-page"
+	defaultHTTPCodeFlagName  = "default-http-code"
+	showDetailsFlagName      = "show-details"
+	proxyHTTPHeadersFlagName = "proxy-headers"
+	disableL10nFlagName      = "disable-l10n"
+)
+
+const (
+	useRandomTemplate              = "random"
+	useRandomTemplateOnEachRequest = "i-said-random"
+	useRandomTemplateDaily         = "random-daily"
+	useRandomTemplateHourly        = "random-hourly"
 )

 // NewCommand creates `serve` command.
-func NewCommand(ctx context.Context, log *zap.Logger, configFile *string) *cobra.Command {
-	var (
-		f   flags
-		cfg *config.Config
-	)
+func NewCommand(log *zap.Logger) *cli.Command { //nolint:funlen
+	var cmd = command{}

-	cmd := &cobra.Command{
-		Use:     "serve",
+	cmd.c = &cli.Command{
+		Name:    "serve",
 		Aliases: []string{"s", "server"},
-		Short:   "Start HTTP server",
-		PreRunE: func(cmd *cobra.Command, _ []string) (err error) {
-			if configFile == nil {
+		Usage:   "Start HTTP server",
+		Action: func(c *cli.Context) error {
+			var cfg *config.Config
+
+			if configPath := c.String(shared.ConfigFileFlag.Name); configPath == "" { // load config from file
 				return errors.New("path to the config file is required for this command")
-			}
-
-			if err = f.OverrideUsingEnv(cmd.Flags()); err != nil {
+			} else if loadedCfg, err := config.FromYamlFile(c.String(shared.ConfigFileFlag.Name)); err != nil {
 				return err
+			} else {
+				cfg = loadedCfg
 			}

-			if cfg, err = config.FromYamlFile(*configFile); err != nil {
-				return err
+			var (
+				ip   = c.String(shared.ListenAddrFlag.Name)
+				port = uint16(c.Uint(shared.ListenPortFlag.Name))
+				o    options.ErrorPage
+			)
+
+			if net.ParseIP(ip) == nil {
+				return fmt.Errorf("wrong IP address [%s] for listening", ip)
 			}

-			return f.Validate()
+			{ // fill options
+				o.Template.Name = c.String(templateNameFlagName)
+				o.L10n.Disabled = c.Bool(disableL10nFlagName)
+				o.Default.PageCode = c.String(defaultErrorPageFlagName)
+				o.Default.HTTPCode = uint16(c.Uint(defaultHTTPCodeFlagName))
+				o.ShowDetails = c.Bool(showDetailsFlagName)
+
+				if headers := c.String(proxyHTTPHeadersFlagName); headers != "" { //nolint:nestif
+					var m = make(map[string]struct{})
+
+					// make unique and ignore empty strings
+					for _, header := range strings.Split(headers, ",") {
+						if h := strings.TrimSpace(header); h != "" {
+							if strings.ContainsRune(h, ' ') {
+								return fmt.Errorf("whitespaces in the HTTP headers for proxying [%s] are not allowed", header)
+							}
+
+							if _, ok := m[h]; !ok {
+								m[h] = struct{}{}
+							}
+						}
+					}
+
+					// convert map into slice
+					o.ProxyHTTPHeaders = make([]string, 0, len(m))
+					for h := range m {
+						o.ProxyHTTPHeaders = append(o.ProxyHTTPHeaders, h)
+					}
+				}
+			}
+
+			if o.Default.HTTPCode > 599 { //nolint:gomnd
+				return fmt.Errorf("wrong default HTTP response code [%d]", o.Default.HTTPCode)
+			}
+
+			return cmd.Run(c.Context, log, cfg, ip, port, o)
+		},
+		Flags: []cli.Flag{
+			shared.ConfigFileFlag,
+			shared.ListenPortFlag,
+			shared.ListenAddrFlag,
+			&cli.StringFlag{
+				Name:    templateNameFlagName,
+				Aliases: []string{"t"},
+				Usage: fmt.Sprintf(
+					"template name (set \"%s\" to use a randomized or \"%s\" to use a randomized template on "+
+						"each request or \"%s/%s\" daily/hourly randomized)",
+					useRandomTemplate,
+					useRandomTemplateOnEachRequest,
+					useRandomTemplateDaily,
+					useRandomTemplateHourly,
+				),
+				EnvVars: []string{env.TemplateName.String()},
+			},
+			&cli.StringFlag{
+				Name:    defaultErrorPageFlagName,
+				Value:   "404",
+				Usage:   "default error page",
+				EnvVars: []string{env.DefaultErrorPage.String()},
+			},
+			&cli.UintFlag{
+				Name:    defaultHTTPCodeFlagName,
+				Value:   404, //nolint:gomnd
+				Usage:   "default HTTP response code",
+				EnvVars: []string{env.DefaultHTTPCode.String()},
+			},
+			&cli.BoolFlag{
+				Name:    showDetailsFlagName,
+				Usage:   "show request details in response",
+				EnvVars: []string{env.ShowDetails.String()},
+			},
+			&cli.StringFlag{
+				Name:    proxyHTTPHeadersFlagName,
+				Usage:   "proxy HTTP request headers list (comma-separated)",
+				EnvVars: []string{env.ProxyHTTPHeaders.String()},
+			},
+			&cli.BoolFlag{
+				Name:    disableL10nFlagName,
+				Usage:   "disable error pages localization",
+				EnvVars: []string{env.DisableL10n.String()},
+			},
 		},
-		RunE: func(*cobra.Command, []string) error { return run(ctx, log, cfg, f) },
 	}

-	f.Init(cmd.Flags())
-
-	return cmd
+	return cmd.c
 }

-// run current command.
-func run(parentCtx context.Context, log *zap.Logger, cfg *config.Config, f flags) error { //nolint:funlen
+// Run current command.
+func (cmd *command) Run( //nolint:funlen
+	parentCtx context.Context, log *zap.Logger, cfg *config.Config, ip string, port uint16, opt options.ErrorPage,
+) error {
 	var (
 		ctx, cancel = context.WithCancel(parentCtx) // serve context creation
 		oss         = breaker.NewOSSignals(ctx)     // OS signals listener
@ -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.Uint16("port", f.Listen.Port),
+			zap.String("addr", ip),
+			zap.Uint16("port", port),
 			zap.String("default error page", opt.Default.PageCode),
 			zap.Uint16("default HTTP response code", opt.Default.HTTPCode),
 			zap.Strings("proxy headers", opt.ProxyHTTPHeaders),
@ -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
@ -1,235 +1,220 @@
 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 { //nolint:gomnd
-						f.Listen.Port = uint16(p)
-					} else {
-						lastErr = fmt.Errorf("wrong TCP port environment variable [%s] value", envVar)
-					}
-				}
-
-			case templateNameFlagName:
-				if envVar, exists := env.TemplateName.Lookup(); exists {
-					f.template.name = strings.TrimSpace(envVar)
-				}
-
-			case defaultErrorPageFlagName:
-				if envVar, exists := env.DefaultErrorPage.Lookup(); exists {
-					f.defaultErrorPage = strings.TrimSpace(envVar)
-				}
-
-			case defaultHTTPCodeFlagName:
-				if envVar, exists := env.DefaultHTTPCode.Lookup(); exists {
-					if code, err := strconv.ParseUint(envVar, 10, 16); err == nil { //nolint:gomnd
-						f.defaultHTTPCode = uint16(code)
-					} else {
-						lastErr = fmt.Errorf("wrong default HTTP response code environment variable [%s] value", envVar)
-					}
-				}
-
-			case showDetailsFlagName:
-				if envVar, exists := env.ShowDetails.Lookup(); exists {
-					if b, err := strconv.ParseBool(envVar); err == nil {
-						f.showDetails = b
-					}
-				}
-
-			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
-}
+// 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
+// }
+//
+//
+//
+// 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"
+
+	"github.com/tarampampam/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.go
+++ b/internal/config/config.go
@ -1,7 +1,6 @@
 package config

 import (
-	"io/ioutil"
 	"os"
 	"path"
 	"path/filepath"
@ -68,7 +67,7 @@ func (t Template) Name() string { return t.name }
 func (t Template) Content() []byte { return t.content }

 func (t *Template) loadContentFromFile(filePath string) (err error) {
-	if t.content, err = ioutil.ReadFile(filePath); err != nil {
+	if t.content, err = os.ReadFile(filePath); err != nil {
 		return errors.Wrap(err, "cannot load content for the template "+t.Name()+" from file "+filePath)
 	}

@ -236,7 +235,7 @@ func FromYaml(in []byte) (_ *Config, err error) {

 // FromYamlFile creates new Config instance using YAML file.
 func FromYamlFile(filepath string) (*Config, error) {
-	bytes, err := ioutil.ReadFile(filepath)
+	bytes, err := os.ReadFile(filepath)
 	if err != nil {
 		return nil, errors.Wrap(err, "cannot read configuration file")
 	}
--- 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/formats.go
+++ b/internal/http/core/formats.go
@ -39,7 +39,7 @@ func ClientWantFormat(ctx *fasthttp.RequestCtx) ContentType {
 				f := format{b[0:idx], 0}

 				if len(b) > idx+3 {
-					if weight, err := strconv.ParseFloat(string(b[idx+3:]), 32); err == nil { //nolint:gomnd
+					if weight, err := strconv.ParseFloat(string(b[idx+3:]), 32); err == nil {
 						f.weight = float32(weight)
 					}
 				}
--- 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"
+
+	"github.com/tarampampam/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"
+
+	"github.com/tarampampam/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.
-func New(verbose, debug, logJSON bool) (*zap.Logger, error) {
+// New creates new "zap" logger with a small customization.
+func New(l Level, f Format) (*zap.Logger, error) {
 	var config zap.Config

-	if logJSON {
-		config = zap.NewProductionConfig()
-	} else {
+	switch f {
+	case ConsoleFormat:
 		config = zap.NewDevelopmentConfig()
 		config.EncoderConfig.EncodeLevel = zapcore.LowercaseColorLevelEncoder
 		config.EncoderConfig.EncodeTime = zapcore.TimeEncoderOfLayout("15:04:05")
+
+	case JSONFormat:
+		config = zap.NewProductionConfig() // json encoder is used by default
+
+	default:
+		return nil, errors.New("unsupported logging format")
 	}

 	// default configuration for all encoders
@ -24,15 +31,31 @@ func New(verbose, debug, logJSON bool) (*zap.Logger, error) {
 	config.DisableStacktrace = true
 	config.DisableCaller = true

-	if debug {
+	// enable additional features for debugging
+	if l <= DebugLevel {
 		config.Development = true
 		config.DisableStacktrace = false
 		config.DisableCaller = false
 	}

-	if verbose || debug {
-		config.Level = zap.NewAtomicLevelAt(zap.DebugLevel)
+	var zapLvl zapcore.Level
+
+	switch l { // convert level to zap.Level
+	case DebugLevel:
+		zapLvl = zap.DebugLevel
+	case InfoLevel:
+		zapLvl = zap.InfoLevel
+	case WarnLevel:
+		zapLvl = zap.WarnLevel
+	case ErrorLevel:
+		zapLvl = zap.ErrorLevel
+	case FatalLevel:
+		zapLvl = zap.FatalLevel
+	default:
+		return nil, errors.New("unsupported logging level")
 	}

+	config.Level = zap.NewAtomicLevelAt(zapLvl)
+
 	return config.Build()
 }
--- 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/stretchr/testify/require"
+
 	"github.com/tarampampam/error-pages/internal/logger"
 )

-func TestNewNotVerboseDebugJSON(t *testing.T) {
+func TestNewDebugLevelConsoleFormat(t *testing.T) {
 	output := capturer.CaptureStderr(func() {
-		log, err := logger.New(false, false, false)
-		assert.NoError(t, err)
+		log, err := logger.New(logger.DebugLevel, logger.ConsoleFormat)
+		require.NoError(t, err)

-		log.Info("inf msg")
 		log.Debug("dbg msg")
+		log.Info("inf msg")
 		log.Error("err msg")
 	})

 	assert.Contains(t, output, time.Now().Format("15:04:05"))
 	assert.Regexp(t, `\t.+info.+\tinf msg`, output)
-	assert.NotContains(t, output, "dbg msg")
-	assert.Contains(t, output, "err msg")
-}
-
-func TestNewVerboseNotDebugJSON(t *testing.T) {
-	output := capturer.CaptureStderr(func() {
-		log, err := logger.New(true, false, false)
-		assert.NoError(t, err)
-
-		log.Info("inf msg")
-		log.Debug("dbg msg")
-		log.Error("err msg")
-	})
-
-	assert.Contains(t, output, time.Now().Format("15:04:05"))
-	assert.Regexp(t, `\t.+info.+\tinf msg`, output)
-	assert.Contains(t, output, "dbg msg")
-	assert.Contains(t, output, "err msg")
-}
-
-func TestNewVerboseDebugNotJSON(t *testing.T) {
-	output := capturer.CaptureStderr(func() {
-		log, err := logger.New(true, true, false)
-		assert.NoError(t, err)
-
-		log.Info("inf msg")
-		log.Debug("dbg msg")
-		log.Error("err msg")
-	})
-
-	assert.Contains(t, output, time.Now().Format("15:04:05"))
 	assert.Regexp(t, `\t.+info.+\t.+logger_test\.go:\d+\tinf msg`, output)
 	assert.Contains(t, output, "dbg msg")
 	assert.Contains(t, output, "err msg")
 }

-func TestNewNotVerboseDebugButJSON(t *testing.T) {
+func TestNewErrorLevelConsoleFormat(t *testing.T) {
 	output := capturer.CaptureStderr(func() {
-		log, err := logger.New(false, false, true)
-		assert.NoError(t, err)
+		log, err := logger.New(logger.ErrorLevel, logger.ConsoleFormat)
+		require.NoError(t, err)

-		log.Info("inf msg")
 		log.Debug("dbg msg")
+		log.Info("inf msg")
+		log.Error("err msg")
+	})
+
+	assert.NotContains(t, output, "inf msg")
+	assert.NotContains(t, output, "dbg msg")
+	assert.Contains(t, output, "err msg")
+}
+
+func TestNewWarnLevelJSONFormat(t *testing.T) {
+	output := capturer.CaptureStderr(func() {
+		log, err := logger.New(logger.WarnLevel, logger.JSONFormat)
+		require.NoError(t, err)
+
+		log.Debug("dbg msg")
+		log.Info("inf msg")
+		log.Warn("warn msg")
 		log.Error("err msg")
 	})

@ -75,6 +62,14 @@ func TestNewNotVerboseDebugButJSON(t *testing.T) {

 	lines := strings.Split(strings.Trim(output, "\n"), "\n")

-	assert.JSONEq(t, `{"level":"info","ts":0.1,"msg":"inf msg"}`, lines[0])
+	assert.JSONEq(t, `{"level":"warn","ts":0.1,"msg":"warn msg"}`, lines[0])
 	assert.JSONEq(t, `{"level":"error","ts":0.1,"msg":"err msg"}`, lines[1])
 }
+
+func TestNewErrors(t *testing.T) {
+	_, err := logger.New(logger.Level(127), logger.ConsoleFormat)
+	require.EqualError(t, err, "unsupported logging level")
+
+	_, err = logger.New(logger.WarnLevel, logger.Format(255))
+	require.EqualError(t, err, "unsupported logging format")
+}
--- a/internal/tpl/render.go
+++ b/internal/tpl/render.go
@ -10,6 +10,7 @@ import (
 	"time"

 	"github.com/pkg/errors"
+
 	"github.com/tarampampam/error-pages/internal/version"
 )

@ -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
@ -2,11 +2,14 @@ package tpl_test

 import (
 	"math/rand"
+	"os"
 	"strconv"
 	"sync"
 	"testing"

 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
 	"github.com/tarampampam/error-pages/internal/tpl"
 )

@ -14,6 +17,10 @@ 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/l10n/l10n.js
+++ b/l10n/l10n.js
@ -10,6 +10,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Fout',
                de: 'Fehler',
                es: 'Error',
+                zh: '错误',
            },
            'Good luck': {
                fr: 'Bonne chance',
@ -19,6 +20,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Veel succes',
                de: 'Viel Glück',
                es: 'Buena Suerte',
+                zh: '祝好运',
            },
            'UH OH': {
                fr: 'Oups',
@ -28,6 +30,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Oeps',
                de: 'Hoppla',
                es: 'Oups',
+                zh: '哎呀',
            },
            'Request details': {
                fr: 'Détails de la requête',
@ -37,6 +40,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Details van verzoek',
                de: 'Details der Anfrage',
                es: 'Detalles de la petición',
+                zh: '请求详情',
            },
            'Double-check the URL': {
                fr: 'Vérifiez l’URL',
@ -46,6 +50,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Controleer de URL',
                de: 'Überprüfen Sie die URL',
                es: 'Verifique la url',
+                zh: '请再次检查地址',
            },
            'Alternatively, go back': {
                fr: 'Essayer de revenir en arrière',
@ -55,6 +60,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Of ga terug',
                de: 'Alternativ gehen Sie zurück',
                es: 'Como alternativa, vuelva atrás',
+                zh: '或返回上一页',
            },
            'Here\'s what might have happened': {
                fr: 'Voici ce qui aurait pu se passer',
@ -64,6 +70,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Wat er gebeurd kan zijn',
                de: 'Folgendes könnte passiert sein',
                es: 'Esto es lo que ha podido pasar',
+                zh: '可能原因有',
            },
            'You may have mistyped the URL': {
                fr: 'Vous avez peut-être mal tapé l’URL',
@ -73,6 +80,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'De URL bevat een typefout',
                de: 'Möglicherweise haben Sie die URL falsch eingegeben',
                es: 'Igual ha escrito mal la URL',
+                zh: '您可能输入了错误的地址',
            },
            'The site was moved': {
                fr: 'Le site a été déplacé',
@ -82,6 +90,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'De site is verplaatst',
                de: 'Die Seite wurde verschoben',
                es: 'El sitio se ha movido',
+                zh: '站点已被转移',
            },
            'It was never here': {
                fr: 'Il n’a jamais été ici',
@ -91,6 +100,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Het was hier nooit',
                de: 'Es war nie hier',
                es: 'Nunca ha estado aquí',
+                zh: '站点从未存在',
            },
            'Bad Request': {
                fr: 'Mauvaise requête',
@ -99,7 +109,8 @@ Object.defineProperty(window, 'l10n', {
                pt: 'Requisição inválida',
                nl: 'Foutieve anvraag',
                de: 'Fehlerhafte Anfrage',
-                es: 'Petición inválida'
+                es: 'Petición inválida',
+                zh: '错误请求',
            },
            'The server did not understand the request': {
                fr: 'Le serveur ne comprend pas la requête',
@ -108,7 +119,8 @@ Object.defineProperty(window, 'l10n', {
                pt: 'O servidor não entendeu a solicitação',
                nl: 'De server begreep het verzoek niet',
                de: 'Der Server hat die Anfrage nicht verstanden',
-                es: 'El servidor no entendió la petición'
+                es: 'El servidor no entendió la petición',
+                zh: '服务器不理解该请求',
            },
            'Unauthorized': {
                fr: 'Non autorisé',
@ -118,6 +130,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Niet geautoriseerd',
                de: 'Nicht autorisiert',
                es: 'No autorizado',
+                zh: '未经授权',
            },
            'The requested page needs a username and a password': {
                fr: 'La page demandée nécessite un nom d’utilisateur et un mot de passe',
@ -127,6 +140,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'De pagina heeft een gebruikersnaam en wachtwoord nodig',
                de: 'Die angeforderte Seite benötigt einen Benutzernamen und ein Passwort',
                es: 'La página solicitada necesita un usuario y una contraseña',
+                zh: '请求的页面需要用户名和密码',
            },
            'Forbidden': {
                fr: 'Interdit',
@ -136,6 +150,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Verboden',
                de: 'Verboten',
                es: 'Prohibido',
+                zh: '禁止访问',
            },
            'Access is forbidden to the requested page': {
                fr: 'Accès interdit à la page demandée',
@ -145,6 +160,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Toegang tot de pagina is verboden',
                de: 'Der Zugriff auf die angeforderte Seite ist verboten',
                es: 'El acceso está prohibido para la página solicitada',
+                zh: '禁止访问请求的页面',
            },
            'Not Found': {
                fr: 'Introuvable',
@ -154,6 +170,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Niet gevonden',
                de: 'Nicht gefunden',
                es: 'No encontrado',
+                zh: '未找到',
            },
            'The server can not find the requested page': {
                fr: 'Le serveur ne peut trouver la page demandée',
@ -163,6 +180,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'De server kan de pagina niet vinden',
                de: 'Der Server kann die angeforderte Seite nicht finden',
                es: 'El servidor no puede encontrar la página solicitada',
+                zh: '服务器找不到请求的页面',
            },
            'Method Not Allowed': {
                fr: 'Méthode Non Autorisée',
@ -172,6 +190,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Methode niet toegestaan',
                de: 'Methode nicht erlaubt',
                es: 'Método no permitido',
+                zh: '方法不被允许',
            },
            'The method specified in the request is not allowed': {
                fr: 'La méthode spécifiée dans la requête n’est pas autorisée',
@ -180,7 +199,8 @@ Object.defineProperty(window, 'l10n', {
                pt: 'O método especificado na solicitação não é permitido',
                nl: 'De methode in het verzoek is niet toegestaan',
                de: 'Die in der Anfrage angegebene Methode ist nicht zulässig',
-                es: 'El método especificado en la petición no está permitido'
+                es: 'El método especificado en la petición no está permitido',
+                zh: '请求指定的方法不被允许',
            },
            'Proxy Authentication Required': {
                fr: 'Authentification proxy requise',
@ -190,6 +210,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Authenticatie op de proxyserver verplicht',
                de: 'Proxy-Authentifizierung benötigt',
                es: 'Autenticación de proxy requerida',
+                zh: '需要代理服务器身份验证',
            },
            'You must authenticate with a proxy server before this request can be served': {
                fr: 'Vous devez vous authentifier avec un serveur proxy avant que cette requête puisse être servie',
@ -199,6 +220,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Je moet authenticeren bij een proxyserver voordat dit verzoek uitgevoerd kan worden',
                de: 'Sie müssen sich bei einem Proxy-Server authentifizieren, bevor diese Anfrage bedient werden kann',
                es: 'Debes autentificarte con un servidor proxy antes de que esta petición pueda ser atendida',
+                zh: '您必须对代理服务器进行身份验证，然后才能让请求得到处理',
            },
            'Request Timeout': {
                fr: 'Requête expiré',
@ -208,6 +230,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Aanvraagtijd verstreken',
                de: 'Zeitüberschreitung der Anforderung',
                es: 'Tiempo límite de la petición excedido',
+                zh: '请求超时',
            },
            'The request took longer than the server was prepared to wait': {
                fr: 'La requête prend plus de temps que prévu',
@ -217,6 +240,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Het verzoek duurde langer dan de server wilde wachten',
                de: 'Die Anfrage hat länger gedauert, als der Server bereit war zu warten',
                es: 'La petición esta tardando más de lo que el servidor estaba preparado para esperar',
+                zh: '请求用时超过了服务器设置的最长等待时间',
            },
            'Conflict': {
                fr: 'Conflit',
@ -226,6 +250,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Conflict',
                de: 'Konflikt',
                es: 'Conflicto',
+                zh: '冲突',
            },
            'The request could not be completed because of a conflict': {
                fr: 'La requête n’a pas pu être complétée à cause d’un conflit',
@ -235,6 +260,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Het verzoek kon niet worden verwerkt vanwege een conflict',
                de: 'Die Anfrage konnte aufgrund eines Konflikts nicht abgeschlossen werden',
                es: 'La petición no ha podido ser completada por un conflicto',
+                zh: '由于冲突，请求无法完成',
            },
            'Gone': {
                fr: 'Supprimé',
@ -244,6 +270,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Verdwenen',
                de: 'Verschwunden',
                es: 'Eliminado',
+                zh: '已移除',
            },
            'The requested page is no longer available': {
                fr: 'La page demandée n’est plus disponible',
@ -253,6 +280,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'De pagina is niet langer beschikbaar',
                de: 'Die angeforderte Seite ist nicht mehr verfügbar',
                es: 'La página solicitada no está ya disponible',
+                zh: '请求的页面不再可用',
            },
            'Length Required': {
                fr: 'Longueur requise',
@ -262,6 +290,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Lengte benodigd',
                de: 'Länge benötigt',
                es: 'Longitud requerida',
+                zh: '需要长度',
            },
            'The "Content-Length" is not defined. The server will not accept the request without it': {
                fr: 'Le "Content-Length" n’est pas défini. Le serveur ne prendra pas en compte la requête',
@ -271,6 +300,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'De "Content-Length" is niet gespecificeerd. De server accepteert het verzoek niet zonder',
                de: 'Die "Content-Length" ist nicht definiert. Ohne sie akzeptiert der Server die Anfrage nicht',
                es: 'El "Content-Legth" no eta definido. Este servidor no aceptará la petición sin él',
+                zh: '未指定Content-Length(内容长度)。服务器将不接受不包含此头信息的请求',
            },
            'Precondition Failed': {
                fr: 'Échec de la condition préalable',
@ -280,6 +310,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Niet voldaan aan vooraf gestelde voorwaarde',
                de: 'Vorbedingung fehlgeschlagen',
                es: 'Precondición fallida',
+                zh: '前置条件判定失败',
            },
            'The pre condition given in the request evaluated to false by the server': {
                fr: 'La précondition donnée dans la requête a été évaluée comme étant fausse par le serveur',
@ -288,7 +319,8 @@ Object.defineProperty(window, 'l10n', {
                pt: 'A pré-condição dada na solicitação avaliada como falsa pelo servidor',
                nl: 'De vooraf gestelde voorwaarde is afgewezen door de server',
                de: 'Die in der Anfrage angegebene Vorbedingung wird vom Server als falsch bewertet',
-                es: 'La precondición ha sido evaluada como negativa para esta petición por el servidor'
+                es: 'La precondición ha sido evaluada como negativa para esta petición por el servidor',
+                zh: '服务器评估请求中给出的前置条件的结果为false(假)',
            },
            'Payload Too Large': {
                fr: 'Charge trop volumineuse',
@ -298,6 +330,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Aanvraag te grood',
                de: 'Anfrage zu groß',
                es: 'Carga muy grande',
+                zh: '请求体过大',
            },
            'The server will not accept the request, because the request entity is too large': {
                fr: 'Le serveur ne prendra pas en compte la requête, car l’entité de la requête est trop volumineuse',
@ -307,6 +340,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'De server accepteert het verzoek niet omdat de aanvraag te groot is',
                de: 'Der Server akzeptiert die Anfrage nicht, da die Datenmenge zu groß ist',
                es: 'El servidor no aceptará esta petición, porque la carga es demasiado grande',
+                zh: '请求体过大，服务器将不接受该请求',
            },
            'Requested Range Not Satisfiable': {
                fr: 'Requête non satisfaisante',
@ -316,6 +350,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Aangevraagd gedeelte niet opvraagbaar',
                de: 'Anfrage-Bereich nicht erfüllbar',
                es: 'Intervalo solicitado no satisfactorio',
+                zh: '不满足请求范围',
            },
            'The requested byte range is not available and is out of bounds': {
                fr: 'Le byte range demandé n’est pas disponible et est hors des limites',
@ -325,6 +360,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'De aangevraagde bytes zijn buiten het limiet',
                de: 'Der angefragte Teilbereich der Ressource existiert nicht oder ist ungültig',
                es: 'El intervalo de bytes requerido no está disponible o se encuentra fuera de los límites',
+                zh: '请求的字节范围不可用，超出边界',
            },
            'I\'m a teapot': {
                fr: 'Je suis une théière',
@ -333,7 +369,8 @@ Object.defineProperty(window, 'l10n', {
                pt: 'Eu sou um bule',
                nl: 'Ik ben een theepot',
                de: 'Ich bin eine Teekanne',
-                es: 'Soy una tetera'
+                es: 'Soy una tetera',
+                zh: '我是一只茶壶',
            },
            'Attempt to brew coffee with a teapot is not supported': {
                fr: 'Tenter de préparer du café avec une théière n’est pas pris en charge',
@ -343,6 +380,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Koffie maken met een theepot is niet ondersteund',
                de: 'Der Versuch, Kaffee mit einer Teekanne zuzubereiten, wird nicht unterstützt',
                es: 'Intentar hacer un café en una tetera no está soportado',
+                zh: '用茶壶泡咖啡不受支持',
            },
            'Too Many Requests': {
                fr: 'Trop de requêtes',
@ -351,7 +389,8 @@ Object.defineProperty(window, 'l10n', {
                pt: 'Excesso de solicitações',
                nl: 'Te veel requests',
                de: 'Zu viele Anfragen',
-                es: 'Demasiadas peticiones'
+                es: 'Demasiadas peticiones',
+                zh: '请求过多',
            },
            'Too many requests in a given amount of time': {
                fr: 'Trop de requêtes dans un délai donné',
@ -361,6 +400,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Te veel verzoeken binnen een bepaalde tijd',
                de: 'Der Client hat zu viele Anfragen in einem bestimmten Zeitraum gesendet',
                es: 'Demasiadas peticiones en un determinado periodo de tiempo',
+                zh: '在给定的时间内发送了过多请求',
            },
            'Internal Server Error': {
                fr: 'Erreur interne du serveur',
@ -370,6 +410,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Interne serverfout',
                de: 'Interner Server-Fehler',
                es: 'Error Interno',
+                zh: '内部服务器错误',
            },
            'The server met an unexpected condition': {
                fr: 'Le serveur a rencontré une condition inattendue',
@ -379,6 +420,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'De server ondervond een onverwachte conditie',
                de: 'Der Server hat einen internen Fehler festgestellt',
                es: 'El servidor ha encontrado una condición no esperada',
+                zh: '服务器遇到了意外情况',
            },
            'Bad Gateway': {
                fr: 'Mauvaise passerelle',
@ -388,6 +430,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Ongeldige Gateway',
                de: 'Fehlerhafter Gateway',
                es: 'Puerta de enlace no valida',
+                zh: '无效网关',
            },
            'The server received an invalid response from the upstream server': {
                fr: 'Le serveur a reçu une réponse invalide du serveur distant',
@ -396,7 +439,8 @@ Object.defineProperty(window, 'l10n', {
                pt: 'O servidor recebeu uma resposta inválida do servidor upstream',
                nl: 'De server ontving een ongeldig antwoord van een bovenliggende server',
                de: 'Der Server hat eine ungültige Antwort vom Upstream-Server erhalten',
-                es: 'El servidor ha recibido una respuesta no válida del servidor de origen'
+                es: 'El servidor ha recibido una respuesta no válida del servidor de origen',
+                zh: '服务器从上游服务器收到了无效的响应',
            },
            'Service Unavailable': {
                fr: 'Service indisponible',
@ -406,6 +450,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Dienst niet beschikbaar',
                de: 'Dienst nicht verfügbar',
                es: 'Servicio no disponible',
+                zh: '服务不可用',
            },
            'The server is temporarily overloading or down': {
                fr: 'Le serveur est temporairement en surcharge ou indisponible',
@ -415,6 +460,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'De server is tijdelijk overbelast of niet bereikbaar',
                de: 'Der Server ist vorübergehend überlastet oder ausgefallen',
                es: 'El servidor está temporalmente sobrecargado o inactivo',
+                zh: '服务器暂时过载或不可用',
            },
            'Gateway Timeout': {
                fr: 'Expiration Passerelle',
@ -424,6 +470,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Gateway Verlopen',
                de: 'Gateway Zeitüberschreitung',
                es: 'Tiempo límite de puerta de enlace excedido',
+                zh: '网关超时',
            },
            'The gateway has timed out': {
                fr: 'Le temps d’attente de la passerelle est dépassé',
@ -433,6 +480,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'De verbinding naar de bovenliggende server is verlopen',
                de: 'Das Zeitlimit für den Verbindungsaufbau mit dem Upstream-Server ist abgelaufen',
                es: 'La puerta de enlace ha sobrepasado el tiempo límite',
+                zh: '网关响应已经超时',
            },
            'HTTP Version Not Supported': {
                fr: 'Version HTTP non prise en charge',
@ -442,6 +490,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'HTTP-versie wordt niet ondersteunt',
                de: 'HTTP-Version wird nicht unterstützt',
                es: 'Versión de HTTP no soportada',
+                zh: 'HTTP版本不受支持',
            },
            'The server does not support the "http protocol" version': {
                fr: 'Le serveur ne supporte pas la version du protocole HTTP',
@ -451,6 +500,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'De server ondersteunt deze HTTP-versie niet',
                de: 'Der Server unterstützt die HTTP-Protokoll-Version nicht',
                es: 'El servidor no soporta la versión del protocolo HTTP',
+                zh: '服务器不支持该HTTP协议版本',
            },

            'Host': {
@ -461,6 +511,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Host',
                de: 'Host',
                es: 'Host',
+                zh: '主机',
            },
            'Original URI': {
                fr: 'URI d’origine',
@ -470,6 +521,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Originele URI',
                de: 'Originale URI',
                es: 'URI original',
+                zh: '原始URI',
            },
            'Forwarded for': {
                fr: 'Transmis pour',
@ -479,6 +531,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Doorgestuurd voor',
                de: 'Weitergeleitet für',
                es: 'Remitido por',
+                zh: '转发自',
            },
            'Namespace': {
                fr: 'Espace de noms',
@ -488,6 +541,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Elementnaam',
                de: 'Namensraum',
                es: 'Namespace',
+                zh: '命名空间',
            },
            'Ingress name': {
                fr: 'Nom ingress',
@ -497,6 +551,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Ingress naam',
                de: 'Ingress Name',
                es: 'Nombre Ingress',
+                zh: '入口名',
            },
            'Service name': {
                fr: 'Nom du service',
@ -505,7 +560,8 @@ Object.defineProperty(window, 'l10n', {
                pt: 'Nome do Serviço',
                nl: 'Service naam',
                de: 'Service Name',
-                es: 'Nombre del servicio'
+                es: 'Nombre del servicio',
+                zh: '服务名',
            },
            'Service port': {
                fr: 'Port du service',
@ -515,6 +571,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Service poort',
                de: 'Service Port',
                es: 'Puerto del servicio',
+                zh: '服务端口',
            },
            'Request ID': {
                fr: 'Identifiant de la requête',
@ -524,6 +581,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'ID van het verzoek',
                de: 'Anfrage ID',
                es: 'ID de la petición',
+                zh: '请求ID',
            },
            'Timestamp': {
                fr: 'Horodatage',
@ -533,6 +591,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Tijdstempel',
                de: 'Zeitstempel',
                es: 'Timestamp',
+                zh: '时间戳',
            },

            'client-side error': {
@ -543,6 +602,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'fout aan de gebruikerskant',
                de: 'Clientseitiger Fehler',
                es: 'Error del lado del cliente',
+                zh: '客户端错误',
            },
            'server-side error': {
                fr: 'Erreur Serveur',
@ -552,6 +612,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'fout aan de serverkant',
                de: 'Serverseitiger Fehler',
                es: 'Error del lado del servidor',
+                zh: '服务端错误',
            },

            'Your Client': {
@ -562,6 +623,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Jouw Client',
                de: 'Ihr Client',
                es: 'Tu cliente',
+                zh: '您的客户端',
            },
            'Network': {
                fr: 'Réseau',
@ -571,6 +633,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Netwerk',
                de: 'Netzwerk',
                es: 'Red',
+                zh: '网络',
            },
            'Web Server': {
                fr: 'Serveur Web',
@ -580,6 +643,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Web Server',
                de: 'Webserver',
                es: 'Servidor web',
+                zh: 'Web服务器',
            },
            'What happened?': {
                fr: 'Que s’est-il passé ?',
@ -589,6 +653,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Wat is er gebeurd?',
                de: 'Was ist passiert?',
                es: '¿Que ha pasado?',
+                zh: '发生了什么？',
            },
            'What can i do?': {
                fr: 'Que puis-je faire ?',
@ -598,6 +663,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Wat kan ik doen?',
                de: 'Was kann ich machen?',
                es: '¿Que puedo hacer?',
+                zh: '我能做什么？',
            },
            'Please try again in a few minutes': {
                fr: 'Veuillez réessayer dans quelques minutes',
@ -607,6 +673,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Probeer het alstublieft opnieuw over een paar minuten',
                de: 'Bitte versuchen Sie es in ein paar Minuten erneut',
                es: 'Por favor, intente nuevamente en unos minutos',
+                zh: '请在几分钟后重试',
            },
            'Working': {
                fr: 'Opérationnel',
@ -616,6 +683,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Functioneel',
                de: 'Funktioniert',
                es: 'Trabajando',
+                zh: '正常运行',
            },
            'Unknown': {
                fr: 'Inconnu',
@ -625,6 +693,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Onbekend',
                de: 'Unbekannt',
                es: 'Desconocido',
+                zh: '未知',
            },
            'Please try to change the request method, headers, payload, or URL': {
                fr: 'Veuillez essayer de changer la méthode de requête, les en-têtes, le contenu ou l’URL',
@ -633,7 +702,8 @@ Object.defineProperty(window, 'l10n', {
                pt: 'Tente alterar o método de solicitação, cabeçalhos, payload ou URL',
                nl: 'Probeer het opnieuw met een andere methode, headers, payload of URL',
                de: 'Bitte versuchen Sie, die Anfragemethode, Header, Payload oder URL zu ändern',
-                es: 'Por favor intente cambiar el método de la petición, cabeceras, carga o URL'
+                es: 'Por favor intente cambiar el método de la petición, cabeceras, carga o URL',
+                zh: '请尝试更改请求方法、标头、有效负载或URL',
            },
            'Please check your authorization data': {
                fr: 'Veuillez vérifier vos données d’autorisation',
@ -643,6 +713,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Controleer de authenticatiegegevens',
                de: 'Bitte überprüfen Sie Ihre Zugangsdaten',
                es: 'Verifique sus datos de autorización',
+                zh: '请检查您的授权数据',
            },
            'Please double-check the URL and try again': {
                fr: 'Veuillez vérifier l’URL et réessayer',
@ -652,6 +723,7 @@ Object.defineProperty(window, 'l10n', {
                nl: 'Controleer de URL en probeer het opnieuw',
                de: 'Bitte überprüfen Sie die URL und versuchen Sie es erneut',
                es: 'Verifique de nuevo la URL y vuelva a probar',
+                zh: '请再次检查URL并重试',
            },
        };

--- a/l10n/readme.md
+++ b/l10n/readme.md
@ -18,3 +18,4 @@ By default, pages markup contains strings in English (`en` locale). If you want
 - 🇳🇱 Dutch by [@SchoNie](https://github.com/SchoNie)
 - 🇩🇪 German by [@mschoeffmann](https://github.com/mschoeffmann)
 - 🇪🇸 Spanish by [@Runig006](https://github.com/Runig006)
+- 🇨🇳 Chinese by [@CDN18](https://github.com/CDN18)
Author	SHA1	Message	Date
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
Paramtamtam	3418f85292	Update CHANGELOG.md	2022-11-02 01:38:14 +04:00
dependabot[bot]	361afd87aa	Bump github.com/stretchr/testify from 1.8.0 to 1.8.1 (#152 ) Bumps [github.com/stretchr/testify](https://github.com/stretchr/testify) from 1.8.0 to 1.8.1. - [Release notes](https://github.com/stretchr/testify/releases) - [Commits](https://github.com/stretchr/testify/compare/v1.8.0...v1.8.1) --- updated-dependencies: - dependency-name: github.com/stretchr/testify dependency-type: direct:production update-type: version-update:semver-patch ... Signed-off-by: dependabot[bot] <support@github.com> Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>	2022-11-02 01:33:17 +04:00
dependabot[bot]	7f6815c274	Bump github.com/spf13/cobra from 1.5.0 to 1.6.1 (#151 )	2022-11-01 21:31:51 +00:00
dependabot[bot]	4ecd70330a	Bump aquasecurity/trivy-action from 0.7.1 to 0.8.0 (#148 )	2022-11-01 21:28:27 +00:00
dependabot[bot]	ae13905512	Bump github.com/prometheus/client_model from 0.2.0 to 0.3.0 (#149 )	2022-11-01 21:27:39 +00:00
dependabot[bot]	e3377d0f28	Bump github.com/fasthttp/router from 1.4.12 to 1.4.13 (#153 )	2022-11-01 21:27:23 +00:00
Paramtamtam	b15061a110	wip: Readme file updated	2022-11-02 01:25:19 +04:00
CDN	6d6945bf44	Add 🇨🇳 Chinese Translation (#147 )	2022-11-02 01:23:29 +04:00
Paramtamtam	cf7c526d4f	golangci-lint issues fixed	2022-11-02 01:13:03 +04:00
renovate[bot]	8e21be0340	Update golangci/golangci-lint Docker tag to v1.50 (#144 ) Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>	2022-10-04 15:41:42 +04:00
dependabot[bot]	37265ccb4f	Bump github.com/fasthttp/router from 1.4.11 to 1.4.12 (#142 )	2022-10-02 05:28:04 +00:00
dependabot[bot]	169fbe3b93	Bump github.com/valyala/fasthttp from 1.39.0 to 1.40.0 (#143 )	2022-10-02 02:22:55 +00:00
renovate[bot]	617b378c36	Update orangeopensource/hurl Docker tag to v1.7.0 (#141 ) Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>	2022-09-24 10:31:48 +04:00
dependabot[bot]	438e954dd6	Bump go.uber.org/zap from 1.21.0 to 1.23.0 (#135 )	2022-09-02 02:57:20 +00:00
dependabot[bot]	df1a0e20ee	Bump aquasecurity/trivy-action from 0.6.1 to 0.7.1 (#137 )	2022-09-02 02:53:52 +00:00
dependabot[bot]	7b3c286790	Bump github.com/valyala/fasthttp from 1.38.0 to 1.39.0 (#136 )	2022-09-02 02:53:34 +00:00
dependabot[bot]	fb7d7c75cf	Bump github.com/prometheus/client_golang from 1.12.2 to 1.13.0 (#138 )	2022-09-02 02:52:41 +00:00
renovate[bot]	1eafe58d16	Update golang Docker tag to v1.19 (#127 ) * Update golang Docker tag to v1.19 * 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>	2022-08-24 21:38:26 +04:00
renovate[bot]	e7a909dc4e	Update golangci/golangci-lint Docker tag to v1.49 (#134 ) Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>	2022-08-24 20:38:41 +04:00