Changelog updated

Flag --default-http-code for the serve subcommand added (#44 )
Bump golang from 1.17.3-alpine to 1.17.5-alpine (#42 )
2024-08-30 18:22:40 +00:00 · 2022-01-03 21:52:47 +05:00 · 2022-01-03 21:51:30 +05:00 · 2022-01-03 15:40:05 +00:00 · 2022-01-02 07:25:37 +00:00 · 2021-12-02 11:08:52 +00:00
34 changed files with 1109 additions and 630 deletions
--- a/.github/dependabot.yml
+++ b/.github/dependabot.yml
@ -0,0 +1,22 @@
+# Docs: <https://docs.github.com/en/free-pro-team@latest/github/administering-a-repository/customizing-dependency-updates>
+
+version: 2
+
+updates:
+  - package-ecosystem: gomod
+    directory: /
+    schedule: {interval: monthly}
+    reviewers: [tarampampam]
+    assignees: [tarampampam]
+
+  - package-ecosystem: github-actions
+    directory: /
+    schedule: {interval: monthly}
+    reviewers: [tarampampam]
+    assignees: [tarampampam]
+
+  - package-ecosystem: docker
+    directory: /
+    schedule: {interval: monthly}
+    reviewers: [tarampampam]
+    assignees: [tarampampam]
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@ -15,7 +15,7 @@ jobs:
        arch: [amd64]  # amd64, 386
    steps:
      - uses: actions/setup-go@v2
-        with: {go-version: 1.17.1}
+        with: {go-version: 1.17.5}

      - uses: actions/checkout@v2

--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@ -134,6 +134,7 @@ jobs: # Docs: <https://git.io/JvxXE>
          test -f ./out/shuffle/404.html
          test -f ./out/noise/404.html
          test -f ./out/hacker-terminal/404.html
+          test -f ./out/cats/404.html

  docker-image:
    name: Build docker image
@ -195,15 +196,16 @@ jobs: # Docs: <https://git.io/JvxXE>
        run: docker load < docker-image.tar

      - name: Run container with the app
-        run: docker run --rm -d -p "8080:8080/tcp" --name app app:ci
+        run: docker run --rm -d -p "8080:8080/tcp" -e "DEFAULT_HTTP_CODE=401" --name app app:ci

      - name: Wait for container "healthy" state
        run: until [[ "`docker inspect -f {{.State.Health.Status}} app`" == "healthy" ]]; do echo "wait 1 sec.."; sleep 1; done

+      - run: test $(curl --write-out %{http_code} --silent --output /dev/null http://127.0.0.1:8080/) -eq 401
      - run: curl --fail http://127.0.0.1:8080/500.html
      - run: curl --fail http://127.0.0.1:8080/400.html
      - run: curl --fail http://127.0.0.1:8080/health/live
-      - run: test $(curl --write-out %{http_code} --silent --output /dev/null http://127.0.0.1:8080/) -eq 404
+      - run: test $(curl --write-out %{http_code} --silent --output /dev/null http://127.0.0.1:8080/foobar) -eq 404

      - name: Stop the container
        if: always()
--- a/.golangci.yml
+++ b/.golangci.yml
@ -5,6 +5,8 @@ run:
  skip-dirs:
    - .github
    - .git
+    - tmp
+    - temp
  modules-download-mode: readonly
  allow-parallel-runners: true

--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@ -4,6 +4,38 @@ 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].

+## v2.3.0
+
+### Added
+
+- Flag `--default-http-code` for the `serve` subcommand (`404` is used by default instead of `200`, environment name `DEFAULT_HTTP_CODE`) [#41]
+
+### Changed
+
+- Go updated from `1.17.1` up to `1.17.5`
+
+[#41]:https://github.com/tarampampam/error-pages/issues/41
+
+## v2.2.0
+
+### Added
+
+- Template `cats` [#31]
+
+[#31]:https://github.com/tarampampam/error-pages/pull/31
+
+## v2.1.0
+
+### Added
+
+- `referer` field in access log records
+- Flag `--default-error-page` for the `serve` subcommand (`404` is used by default, environment name `DEFAULT_ERROR_PAGE`)
+
+### Changed
+
+- The source code has been refactored
+- The index page (`/`) now returns the error page with a code, declared using `--default-error-page` flag (HTTP code 200, when a page code exists)
+
 ## v2.0.0

 ### Changed
--- a/6
+++ b/6
@ -1,7 +1,7 @@
 # syntax=docker/dockerfile:1.2

 # Image page: <https://hub.docker.com/_/golang>
-FROM golang:1.17.1-alpine as builder
+FROM golang:1.17.5-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"
@ -64,7 +64,9 @@ USER appuser:appuser
 WORKDIR /opt

 ENV LISTEN_PORT="8080" \
-    TEMPLATE_NAME="ghost"
+    TEMPLATE_NAME="ghost" \
+    DEFAULT_ERROR_PAGE="404" \
+    DEFAULT_HTTP_CODE="404"

 # Docs: <https://docs.docker.com/engine/reference/builder/#healthcheck>
 HEALTHCHECK --interval=7s --timeout=2s CMD [ \
--- a/README.md
+++ b/README.md
@ -30,8 +30,6 @@ Also, this project can be used for the [**Traefik** error pages customization](h

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

-[![image stats](https://dockeri.co/image/tarampampam/error-pages)][link_docker_hub]
-
 Registry                               | Image
 -------------------------------------- | -----
 [Docker Hub][link_docker_hub]          | `tarampampam/error-pages`
@ -56,13 +54,26 @@ $ docker run --rm -it \
 </p>
 </details>

+## Templates

+Name              | Preview
+:---------------: | :-----:
+`ghost`           | [![ghost](https://hsto.org/webt/oj/cl/4k/ojcl4ko_cvusy5xuki6efffzsyo.gif)](https://tarampampam.github.io/error-pages/ghost/404.html)
+`l7-light`        | [![l7-light](https://hsto.org/webt/xc/iq/vt/xciqvty-aoj-rchfarsjhutpjny.png)](https://tarampampam.github.io/error-pages/l7-light/404.html)
+`l7-dark`         | [![l7-dark](https://hsto.org/webt/s1/ih/yr/s1ihyrqs_y-sgraoimfhk6ypney.png)](https://tarampampam.github.io/error-pages/l7-dark/404.html)
+`shuffle`         | [![shuffle](https://hsto.org/webt/7w/rk/3m/7wrk3mrzz3y8qfqwovmuvacu-bs.gif)](https://tarampampam.github.io/error-pages/shuffle/404.html)
+`noise`           | [![noise](https://hsto.org/webt/42/oq/8y/42oq8yok_i-arrafjt6hds_7ahy.gif)](https://tarampampam.github.io/error-pages/noise/404.html)
+`hacker-terminal` | [![hacker-terminal](https://hsto.org/webt/5s/l0/p1/5sl0p1_ud_nalzjzsj5slz6dfda.gif)](https://tarampampam.github.io/error-pages/hacker-terminal/404.html)
+`cats`            | [![cats](https://hsto.org/webt/_g/y-/ke/_gy-keqinz-3867jbw36v37-iwe.jpeg)](https://tarampampam.github.io/error-pages/cats/404.html)
+
+> Note: `noise` template highly uses the CPU, be careful

 ## Usage

 All of the examples below will use a docker image with the application, but you can also use a binary. By the way, our docker image uses the **unleveled user** by default and **distroless**.

-### HTTP server
+<details>
+  <summary><strong>HTTP server</strong></summary>

 As mentioned above - our application can be run as an HTTP server. It only needs to specify the path to the configuration file (it does not need statically generated error pages). The server uses [FastHTTP][fasthttp] and stores all necessary data in memory - so it does not use the file system and very fast. Oh yes, the image with the app also contains a configured **healthcheck** and **logs in JSON** format :)

@ -86,8 +97,10 @@ To see the help run the following command:
 ```bash
 $ docker run --rm tarampampam/error-pages serve --help
 ```
+</details>

-### Generator
+<details>
+  <summary><strong>Generator</strong></summary>

 Create a config file (`error-pages.yml`) with the following content:

@ -158,13 +171,15 @@ To see the usage help run the following command:
 ```bash
 $ docker run --rm tarampampam/error-pages build --help
 ```
+</details>

-### Static error pages
+<details>
+  <summary><strong>Static error pages</strong></summary>

 You may want to use the generated error pages somewhere else, and you can simply extract them from the docker image to your local directory for this purpose:

 ```bash
-$ docker create --name error-pages tarampampam/error-pages:2.0.0-rc2
+$ docker create --name error-pages tarampampam/error-pages
 $ docker cp error-pages:/opt/html ./out
 $ docker rm -f error-pages
 $ ls ./out
@ -187,7 +202,35 @@ $ tree
    ...
 ```

-### Custom error pages for your image with [nginx][link_nginx]
+Or inside another docker image:
+
+```dockerfile
+FROM alpine:latest
+
+COPY --from=tarampampam/error-pages /opt/html /error-pages
+
+RUN ls -l /error-pages
+```
+
+```bash
+$ docker build --rm .
+
+...
+Step 3/3 : RUN ls -l /error-pages
+ ---> Running in 30095dc344a9
+total 12
+drwxr-xr-x    2 root     root           326 Sep 29 15:44 ghost
+drwxr-xr-x    2 root     root           326 Sep 29 15:44 hacker-terminal
+-rw-r--r--    1 root     root         11241 Sep 29 15:44 index.html
+drwxr-xr-x    2 root     root           326 Sep 29 15:44 l7-dark
+drwxr-xr-x    2 root     root           326 Sep 29 15:44 l7-light
+drwxr-xr-x    2 root     root           326 Sep 29 15:44 noise
+drwxr-xr-x    2 root     root           326 Sep 29 15:44 shuffle
+```
+</details>
+
+<details>
+  <summary><strong>Custom error pages for your image with nginx</strong></summary>

 You can build your own docker image with `nginx` and our error pages:

@ -220,12 +263,12 @@ server {
 ```dockerfile
 # File `Dockerfile`

-FROM nginx:1.21-alpine
+FROM nginx:1.23-alpine

 COPY --chown=nginx \
     ./nginx.conf /etc/nginx/conf.d/default.conf
 COPY --chown=nginx \
-     --from=tarampampam/error-pages:2.0.0 \
+     --from=tarampampam/error-pages:2.2.0 \
     /opt/html/ghost /usr/share/nginx/errorpages/_error-pages
 ```

@ -234,19 +277,7 @@ $ docker build --tag your-nginx:local -f ./Dockerfile .
 ```

 > More info about `error_page` directive can be [found here](http://nginx.org/en/docs/http/ngx_http_core_module.html#error_page).
-
-## Templates
-
-Name              | Preview
-:---------------: | :-----:
-`ghost`           | [![ghost](https://hsto.org/webt/oj/cl/4k/ojcl4ko_cvusy5xuki6efffzsyo.gif)](https://tarampampam.github.io/error-pages/ghost/404.html)
-`l7-light`        | [![l7-light](https://hsto.org/webt/xc/iq/vt/xciqvty-aoj-rchfarsjhutpjny.png)](https://tarampampam.github.io/error-pages/l7-light/404.html)
-`l7-dark`         | [![l7-dark](https://hsto.org/webt/s1/ih/yr/s1ihyrqs_y-sgraoimfhk6ypney.png)](https://tarampampam.github.io/error-pages/l7-dark/404.html)
-`shuffle`         | [![shuffle](https://hsto.org/webt/7w/rk/3m/7wrk3mrzz3y8qfqwovmuvacu-bs.gif)](https://tarampampam.github.io/error-pages/shuffle/404.html)
-`noise`           | [![noise](https://hsto.org/webt/42/oq/8y/42oq8yok_i-arrafjt6hds_7ahy.gif)](https://tarampampam.github.io/error-pages/noise/404.html)
-`hacker-terminal` | [![hacker-terminal](https://hsto.org/webt/5s/l0/p1/5sl0p1_ud_nalzjzsj5slz6dfda.gif)](https://tarampampam.github.io/error-pages/hacker-terminal/404.html)
-
-> Note: `noise` template highly uses the CPU, be careful
+</details>

 ## Custom error pages for [Traefik][link_traefik]

@ -257,7 +288,7 @@ version: '3.8'

 services:
  error-pages:
-    image: tarampampam/error-pages:2.0.0
+    image: tarampampam/error-pages:2.2.0
    environment:
      TEMPLATE_NAME: l7-dark
    networks:
--- a/docker-compose.yml
+++ b/docker-compose.yml
@ -1,6 +1,6 @@
 # Docker-compose file is used only for local development. This is not production-ready example.

-version: '3.4'
+version: '3.8'

 volumes:
  tmp-data: {}
@ -8,7 +8,7 @@ volumes:

 services:
  app: &app-service
-    image: golang:1.17.1-buster # Image page: <https://hub.docker.com/_/golang>
+    image: golang:1.17.5-buster # Image page: <https://hub.docker.com/_/golang>
    working_dir: /src
    environment:
      HOME: /tmp
--- a/error-pages.yml
+++ b/error-pages.yml
@ -10,6 +10,7 @@ templates:
  - path: ./templates/shuffle.html
  - path: ./templates/noise.html
  - path: ./templates/hacker-terminal.html
+  - path: ./templates/cats.html

 pages:
  400:
--- a/go.mod
+++ b/go.mod
@ -3,15 +3,15 @@ module github.com/tarampampam/error-pages
 go 1.17

 require (
-	github.com/a8m/envsubst v1.2.0
-	github.com/fasthttp/router v1.4.3
-	github.com/fatih/color v1.7.0
+	github.com/a8m/envsubst v1.3.0
+	github.com/fasthttp/router v1.4.4
+	github.com/fatih/color v1.13.0
 	github.com/kami-zh/go-capturer v0.0.0-20171211120116-e492ea43421d
-	github.com/pkg/errors v0.8.1
-	github.com/spf13/cobra v1.2.1
+	github.com/pkg/errors v0.9.1
+	github.com/spf13/cobra v1.3.0
 	github.com/spf13/pflag v1.0.5
 	github.com/stretchr/testify v1.7.0
-	github.com/valyala/fasthttp v1.30.0
+	github.com/valyala/fasthttp v1.31.0
 	go.uber.org/zap v1.19.1
 	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b
 )
@ -21,12 +21,12 @@ require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/inconshreveable/mousetrap v1.0.0 // indirect
 	github.com/klauspost/compress v1.13.6 // indirect
-	github.com/mattn/go-colorable v0.0.9 // indirect
-	github.com/mattn/go-isatty v0.0.3 // indirect
+	github.com/mattn/go-colorable v0.1.12 // indirect
+	github.com/mattn/go-isatty v0.0.14 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/savsgio/gotils v0.0.0-20210921075833-21a6215cb0e4 // indirect
 	github.com/valyala/bytebufferpool v1.0.0 // indirect
 	go.uber.org/atomic v1.7.0 // indirect
 	go.uber.org/multierr v1.6.0 // indirect
-	golang.org/x/sys v0.0.0-20210514084401-e8d321eab015 // indirect
+	golang.org/x/sys v0.0.0-20211205182925-97ca703d548d // indirect
 )
--- a/go.sum
+++ b/go.sum
@ -18,6 +18,15 @@ cloud.google.com/go v0.74.0/go.mod h1:VV1xSbzvo+9QJOxLDaJfTjx5e+MePCpCWwvftOeQmW
 cloud.google.com/go v0.78.0/go.mod h1:QjdrLG0uq+YwhjoVOLsS1t7TW8fs36kLs4XO5R5ECHg=
 cloud.google.com/go v0.79.0/go.mod h1:3bzgcEeQlzbuEAYu4mrWhKqWjmpprinYgKJLgKHnbb8=
 cloud.google.com/go v0.81.0/go.mod h1:mk/AM35KwGk/Nm2YSeZbxXdrNK3KZOYHmLkOqC2V6E0=
+cloud.google.com/go v0.83.0/go.mod h1:Z7MJUsANfY0pYPdw0lbnivPx4/vhy/e2FEkSkF7vAVY=
+cloud.google.com/go v0.84.0/go.mod h1:RazrYuxIK6Kb7YrzzhPoLmCVzl7Sup4NrbKPg8KHSUM=
+cloud.google.com/go v0.87.0/go.mod h1:TpDYlFy7vuLzZMMZ+B6iRiELaY7z/gJPaqbMx6mlWcY=
+cloud.google.com/go v0.90.0/go.mod h1:kRX0mNRHe0e2rC6oNakvwQqzyDmg57xJ+SZU1eT2aDQ=
+cloud.google.com/go v0.93.3/go.mod h1:8utlLll2EF5XMAV15woO4lSbWQlk8rer9aLOfLh7+YI=
+cloud.google.com/go v0.94.1/go.mod h1:qAlAugsXlC+JWO+Bke5vCtc9ONxjQT3drlTTnAplMW4=
+cloud.google.com/go v0.97.0/go.mod h1:GF7l59pYBVlXQIBLx3a761cZ41F9bBH3JUlihCt2Udc=
+cloud.google.com/go v0.98.0/go.mod h1:ua6Ush4NALrHk5QXDWnjvZHN93OuF0HfuEPq9I1X0cM=
+cloud.google.com/go v0.99.0/go.mod h1:w0Xx2nLzqWJPuozYQX+hFfCSI8WioryfRDzkoI/Y2ZA=
 cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
 cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
 cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc=
@ -26,7 +35,7 @@ cloud.google.com/go/bigquery v1.7.0/go.mod h1://okPTzCYNXSlb24MZs83e2Do+h+VXtc4g
 cloud.google.com/go/bigquery v1.8.0/go.mod h1:J5hqkt3O0uAFnINi6JXValWIb1v0goeZM77hZzJN/fQ=
 cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
 cloud.google.com/go/datastore v1.1.0/go.mod h1:umbIZjpQpHh4hmRpGhH4tLFup+FVzqBi1b3c64qFpCk=
-cloud.google.com/go/firestore v1.1.0/go.mod h1:ulACoGHTpvq5r8rxGJ4ddJZBZqakUQqClKRT5SZwBmk=
+cloud.google.com/go/firestore v1.6.1/go.mod h1:asNXNOzBdyVQmEU+ggO8UPodTkEVFW5Qx+rwHnAz+EY=
 cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
 cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw=
 cloud.google.com/go/pubsub v1.2.0/go.mod h1:jhfEVHT8odbXTkndysNHCcx0awwzvfOlguIAii9o8iA=
@ -39,30 +48,53 @@ cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
-github.com/a8m/envsubst v1.2.0 h1:yvzAhJD2QKdo35Ut03wIfXQmg+ta3wC/1bskfZynz+Q=
-github.com/a8m/envsubst v1.2.0/go.mod h1:PpvLvNWa+Rvu/10qXmFbFiGICIU5hZvFJNPCCkUaObg=
+github.com/DataDog/datadog-go v3.2.0+incompatible/go.mod h1:LButxg5PwREeZtORoXG3tL4fMGNddJ+vMq1mwgfaqoQ=
+github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
+github.com/a8m/envsubst v1.3.0 h1:GmXKmVssap0YtlU3E230W98RWtWCyIZzjtf1apWWyAg=
+github.com/a8m/envsubst v1.3.0/go.mod h1:MVUTQNGQ3tsjOOtKCNd+fl8RzhsXcDvvAEzkhGtlsbY=
+github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
+github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
+github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/andybalholm/brotli v1.0.2/go.mod h1:loMXtMfwqflxFJPmdbJO0a3KNoPuLBgiu3qAvBg8x/Y=
 github.com/andybalholm/brotli v1.0.3 h1:fpcw+r1N1h0Poc1F/pHbW40cUm/lMEQslZtCkBQ0UnM=
 github.com/andybalholm/brotli v1.0.3/go.mod h1:fO7iG3H7G2nSZ7m0zPUDn85XEX2GTukHGRSepvi9Eig=
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@ -72,22 +104,35 @@ github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1m
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@ -96,6 +141,7 @@ github.com/golang/mock v1.4.1/go.mod h1:UOMv5ysSaYNkG+OFQykRIcU/QvvxJf3p21QfJ2Bt
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@ -127,10 +173,12 @@ github.com/google/go-cmp v0.5.2/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/
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@ -142,41 +190,59 @@ github.com/google/pprof v0.0.0-20201023163331-3e6fc7fc9c4c/go.mod h1:kpwsk12EmLe
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 github.com/spf13/jwalterweatherman v1.1.0/go.mod h1:aNWZUN0dPAAO/Ljvb5BEdw96iTZ0EXowPYD95IqWIGo=
 github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
 github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
-github.com/spf13/viper v1.8.1/go.mod h1:o0Pch8wJ9BVSWGQMbra6iw0oQ5oktSIBaujf1rJH9Ns=
+github.com/spf13/viper v1.10.0/go.mod h1:SoyBPwAtKDzypXNDFKN5kzH7ppppbGZtls1UpIy5AsM=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
@ -244,19 +344,20 @@ github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/
 github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/subosito/gotenv v1.2.0/go.mod h1:N0PQaV/YGNqwC0u51sEeR/aUtSLEXKX9iv69rRypqCw=
+github.com/tv42/httpunix v0.0.0-20150427012821-b75d8614f926/go.mod h1:9ESjWnEqriFuLhtthL60Sar/7RFoluCcXsuvEwTV5KM=
 github.com/valyala/bytebufferpool v1.0.0 h1:GqA5TC/0021Y/b9FG4Oi9Mr3q7XYx6KllzawFIhcdPw=
 github.com/valyala/bytebufferpool v1.0.0/go.mod h1:6bBcMArwyJ5K/AmCkWv1jt77kVWyCJ6HpOuEn7z0Csc=
-github.com/valyala/fasthttp v1.30.0 h1:nBNzWrgZUUHohyLPU/jTvXdhrcaf2m5k3bWk+3Q049g=
-github.com/valyala/fasthttp v1.30.0/go.mod h1:2rsYD01CKFrjjsvFxx75KlEUNpWNBY9JWD3K/7o2Cus=
+github.com/valyala/fasthttp v1.31.0 h1:lrauRLII19afgCs2fnWRJ4M5IkV0lo2FqA61uGkNBfE=
+github.com/valyala/fasthttp v1.31.0/go.mod h1:2rsYD01CKFrjjsvFxx75KlEUNpWNBY9JWD3K/7o2Cus=
 github.com/valyala/tcplisten v1.0.0/go.mod h1:T0xQ8SeCZGxckz9qRXTfG43PvQ/mcWh7FwZEA7Ioqkc=
 github.com/yuin/goldmark v1.1.25/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.1.32/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.3.5/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k=
-go.etcd.io/etcd/api/v3 v3.5.0/go.mod h1:cbVKeC6lCfl7j/8jBhAK6aIYO9XOjdptoxU/nLQcPvs=
-go.etcd.io/etcd/client/pkg/v3 v3.5.0/go.mod h1:IJHfcCEKxYu1Os13ZdwCwIUTUVGYTSAM3YSwc9/Ac1g=
-go.etcd.io/etcd/client/v2 v2.305.0/go.mod h1:h9puh54ZTgAKtEbut2oe9P4L/oqKCVB6xsXlzd7alYQ=
+go.etcd.io/etcd/api/v3 v3.5.1/go.mod h1:cbVKeC6lCfl7j/8jBhAK6aIYO9XOjdptoxU/nLQcPvs=
+go.etcd.io/etcd/client/pkg/v3 v3.5.1/go.mod h1:IJHfcCEKxYu1Os13ZdwCwIUTUVGYTSAM3YSwc9/Ac1g=
+go.etcd.io/etcd/client/v2 v2.305.1/go.mod h1:pMEacxZW7o8pg4CrFE7pquyCJJzZvkvdD2RibOCCCGs=
 go.opencensus.io v0.21.0/go.mod h1:mSImk1erAIZhrmZN+AvHh14ztQfjbGwt4TtuofqLduU=
 go.opencensus.io v0.22.0/go.mod h1:+kGneAE2xo2IficOXnaByMWTGM9T73dGwxeWcUqIpI8=
 go.opencensus.io v0.22.2/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
@ -264,6 +365,7 @@ go.opencensus.io v0.22.3/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
 go.opencensus.io v0.22.4/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
 go.opencensus.io v0.22.5/go.mod h1:5pWMHQbX5EPX2/62yrJeAkowc+lfs/XD7Uxpq3pI6kk=
 go.opencensus.io v0.23.0/go.mod h1:XItmlyltB5F7CS4xOC1DcqMoFqwtC6OG2xF7mCv7P7E=
+go.opentelemetry.io/proto/otlp v0.7.0/go.mod h1:PqfVotwruBrMGOCsRd/89rSnXhoiJIqeYNgFYFoEGnI=
 go.uber.org/atomic v1.7.0 h1:ADUqmZGgLDDfbSL9ZmPxKTybcoEYHgpYfELNoN+7hsw=
 go.uber.org/atomic v1.7.0/go.mod h1:fEN4uk6kAWBTFdckzkM89CLk9XfWZrxpCo0nPH17wJc=
 go.uber.org/goleak v1.1.11-0.20210813005559-691160354723 h1:sHOAIxRGBp443oHZIPB+HsUGaksVCXVQENPxwTfQdH4=
@ -273,14 +375,17 @@ go.uber.org/multierr v1.6.0/go.mod h1:cdWPpRnG4AhwMwsgIHip0KRBQjJy5kYEpYjJxpXp9i
 go.uber.org/zap v1.17.0/go.mod h1:MXVU+bhUf/A7Xi2HNOnopQOrmycQ5Ih87HtOu4q5SSo=
 go.uber.org/zap v1.19.1 h1:ue41HOKd1vGURxrmeKIgELGb3jPW9DMUDGtsinblHwI=
 go.uber.org/zap v1.19.1/go.mod h1:j3DNczoxDZroyBnOT1L/Q79cfUMGZxlv/9dzN7SM1rI=
+golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20181029021203-45a5f77698d3/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=
 golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20190820162420-60c769a6c586/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/crypto v0.0.0-20190923035154-9ee001bba392/go.mod h1:/lpIB1dKB+9EgE3H3cr1v9wB50oz8l4C4h62xy7jSTY=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.0.0-20210513164829-c07d793c2f9a/go.mod h1:P+XmwS30IXTQdn5tA2iutPOUgjI07+tq3H3K9MVA1s8=
+golang.org/x/crypto v0.0.0-20210817164053-32db794688a5/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190510132918-efd6b22b2522/go.mod h1:ZjyILWgesfNpC6sMxTJOJm9Kp84zZh5NQWvqDGG3Qr8=
@ -316,10 +421,11 @@ golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.4.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.4.1/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
+golang.org/x/mod v0.5.0/go.mod h1:5OXOZSfqPIIbmVBIIKWRFfZjPR0E5r58TLhUjH0a2Ro=
 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20181023162649-9b4f9f5ad519/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
-golang.org/x/net v0.0.0-20181201002055-351d144fa1fc/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
+golang.org/x/net v0.0.0-20181114220301-adae6a3d119a/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190108225652-1e06a53dbb7e/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
@ -327,9 +433,11 @@ golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn
 golang.org/x/net v0.0.0-20190501004415-9ce7a6920f09/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190503192946-f4e77d36d62c/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190603091049-60506f45cf65/go.mod h1:HSz+uSET+XFnRR8LxR5pz3Of3rY3CfYBVs4xY44aLks=
+golang.org/x/net v0.0.0-20190613194153-d28f0bde5980/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20190628185345-da137c7871d7/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20190724013045-ca1201d0de80/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20190923162816-aa69164e4478/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20191209160850-c0dbc17a3553/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20200114155413-6afb5195e5aa/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20200202094626-16171245cfb2/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
@ -352,7 +460,10 @@ golang.org/x/net v0.0.0-20210119194325-5f4716e94777/go.mod h1:m0MpNAwzfU5UDzcl9v
 golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/net v0.0.0-20210316092652-d523dce5a7f4/go.mod h1:RBQZq4jEuRlivfhVLdyRGr576XBO4/greRjx4P4O3yc=
 golang.org/x/net v0.0.0-20210405180319-a5a99cb37ef4/go.mod h1:p54w0d4576C0XHj96bSt6lcn1PtDYWL6XObtHCRCNQM=
+golang.org/x/net v0.0.0-20210410081132-afb366fc7cd1/go.mod h1:9tjilg8BloeKEkVJvy7fQ90B1CfIiPueXVOjqfkSzI8=
+golang.org/x/net v0.0.0-20210503060351-7fd8e65b6420/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/net v0.0.0-20210510120150-4163338589ed/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
+golang.org/x/net v0.0.0-20210813160813-60bc85c4be6d/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 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=
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@ -364,7 +475,12 @@ golang.org/x/oauth2 v0.0.0-20201208152858-08078c50e5b5/go.mod h1:KelEdhl1UZF7XfJ
 golang.org/x/oauth2 v0.0.0-20210218202405-ba52d332ba99/go.mod h1:KelEdhl1UZF7XfJ4dDtk6s++YSgaE7mD/BuKKDLBl4A=
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-golang.org/x/oauth2 v0.0.0-20210402161424-2e8d93401602/go.mod h1:KelEdhl1UZF7XfJ4dDtk6s++YSgaE7mD/BuKKDLBl4A=
+golang.org/x/oauth2 v0.0.0-20210514164344-f6687ab2804c/go.mod h1:KelEdhl1UZF7XfJ4dDtk6s++YSgaE7mD/BuKKDLBl4A=
+golang.org/x/oauth2 v0.0.0-20210628180205-a41e5a781914/go.mod h1:KelEdhl1UZF7XfJ4dDtk6s++YSgaE7mD/BuKKDLBl4A=
+golang.org/x/oauth2 v0.0.0-20210805134026-6f1e6394065a/go.mod h1:KelEdhl1UZF7XfJ4dDtk6s++YSgaE7mD/BuKKDLBl4A=
+golang.org/x/oauth2 v0.0.0-20210819190943-2bc19b11175f/go.mod h1:KelEdhl1UZF7XfJ4dDtk6s++YSgaE7mD/BuKKDLBl4A=
+golang.org/x/oauth2 v0.0.0-20211005180243-6b3c2da341f1/go.mod h1:KelEdhl1UZF7XfJ4dDtk6s++YSgaE7mD/BuKKDLBl4A=
+golang.org/x/oauth2 v0.0.0-20211104180415-d3ed0bb246c8/go.mod h1:KelEdhl1UZF7XfJ4dDtk6s++YSgaE7mD/BuKKDLBl4A=
 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=
@ -378,21 +494,30 @@ golang.org/x/sync v0.0.0-20201207232520-09787c993a3a/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20180823144017-11551d06cbcc/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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 golang.org/x/sys v0.0.0-20181026203630-95b1ffbd15a5/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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 golang.org/x/sys v0.0.0-20190502145724-3ef323f4f1fd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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 golang.org/x/sys v0.0.0-20190726091711-fc99dfbffb4e/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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 golang.org/x/sys v0.0.0-20191228213918-04cbcbbfeed8/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200113162924-86b910548bc1/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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 golang.org/x/sys v0.0.0-20200122134326-e047566fdf82/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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 golang.org/x/sys v0.0.0-20200202164722-d101bd2416d5/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200212091648-12a6c2dcc1e4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@ -411,6 +536,7 @@ golang.org/x/sys v0.0.0-20201201145000-ef89a241ccb3/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20210104204734-6f8348627aad/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210119212857-b64e53b001e4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210220050731-9a76102bfb43/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
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 golang.org/x/sys v0.0.0-20210305230114-8fe3ee5dd75b/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210315160823-c6e025ad8005/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210320140829-1e4c9ba3b0c4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
@ -418,8 +544,20 @@ golang.org/x/sys v0.0.0-20210330210617-4fbd30eecc44/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20210403161142-5e06dd20ab57/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210423082822-04245dca01da/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210510120138-977fb7262007/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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 golang.org/x/sys v0.0.0-20210514084401-e8d321eab015/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
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 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
@ -429,6 +567,7 @@ golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.4/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.5/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
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 golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20191024005414-555d28b269f0/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
@ -438,7 +577,6 @@ golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3
 golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190312151545-0bb0c0a6e846/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190312170243-e65039ee4138/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
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 golang.org/x/tools v0.0.0-20190425150028-36563e24a262/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
 golang.org/x/tools v0.0.0-20190506145303-2d16b83fe98c/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
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@ -446,9 +584,9 @@ golang.org/x/tools v0.0.0-20190606124116-d0a3d012864b/go.mod h1:/rFqwRUd4F7ZHNgw
 golang.org/x/tools v0.0.0-20190621195816-6e04913cbbac/go.mod h1:/rFqwRUd4F7ZHNgwSSTFct+R/Kf4OFW1sUzUTQQTgfc=
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@ -482,7 +620,10 @@ golang.org/x/tools v0.0.0-20201208233053-a543418bbed2/go.mod h1:emZCQorbCU4vsT4f
 golang.org/x/tools v0.0.0-20210105154028-b0ab187a4818/go.mod h1:emZCQorbCU4vsT4fOWvOPXz4eW1wZW4PmDk9uLelYpA=
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@ -509,7 +650,17 @@ google.golang.org/api v0.36.0/go.mod h1:+z5ficQTmoYpPn8LCUNVpK5I7hwkpjbcgqA7I34q
 google.golang.org/api v0.40.0/go.mod h1:fYKFpnQN0DsDSKRVRcQSDQNtqWPfM9i+zNPxepjRCQ8=
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-google.golang.org/api v0.44.0/go.mod h1:EBOGZqzyhtvMDoxwS97ctnh0zUmYY6CxqXsc1AvkYD8=
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+google.golang.org/api v0.61.0/go.mod h1:xQRti5UdCmoCEqFxcz93fTl338AVqDgyaDRuOZ3hg9I=
+google.golang.org/api v0.62.0/go.mod h1:dKmwPCydfsad4qCH08MSdgWjfHOyfpd4VtDGgRFdavw=
 google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
 google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
 google.golang.org/appengine v1.5.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
@ -557,7 +708,29 @@ google.golang.org/genproto v0.0.0-20210303154014-9728d6b83eeb/go.mod h1:FWY/as6D
 google.golang.org/genproto v0.0.0-20210310155132-4ce2db91004e/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/genproto v0.0.0-20210319143718-93e7006c17a6/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
 google.golang.org/genproto v0.0.0-20210402141018-6c239bbf2bb1/go.mod h1:9lPAdzaEmUacj36I+k7YKbEc5CXzPIeORRgDAUOu28A=
+google.golang.org/genproto v0.0.0-20210513213006-bf773b8c8384/go.mod h1:P3QM42oQyzQSnHPnZ/vqoCdDmzH28fzWByN9asMeM8A=
 google.golang.org/genproto v0.0.0-20210602131652-f16073e35f0c/go.mod h1:UODoCrxHCcBojKKwX1terBiRUaqAsFqJiF615XL43r0=
+google.golang.org/genproto v0.0.0-20210604141403-392c879c8b08/go.mod h1:UODoCrxHCcBojKKwX1terBiRUaqAsFqJiF615XL43r0=
+google.golang.org/genproto v0.0.0-20210608205507-b6d2f5bf0d7d/go.mod h1:UODoCrxHCcBojKKwX1terBiRUaqAsFqJiF615XL43r0=
+google.golang.org/genproto v0.0.0-20210624195500-8bfb893ecb84/go.mod h1:SzzZ/N+nwJDaO1kznhnlzqS8ocJICar6hYhVyhi++24=
+google.golang.org/genproto v0.0.0-20210713002101-d411969a0d9a/go.mod h1:AxrInvYm1dci+enl5hChSFPOmmUF1+uAa/UsgNRWd7k=
+google.golang.org/genproto v0.0.0-20210716133855-ce7ef5c701ea/go.mod h1:AxrInvYm1dci+enl5hChSFPOmmUF1+uAa/UsgNRWd7k=
+google.golang.org/genproto v0.0.0-20210728212813-7823e685a01f/go.mod h1:ob2IJxKrgPT52GcgX759i1sleT07tiKowYBGbczaW48=
+google.golang.org/genproto v0.0.0-20210805201207-89edb61ffb67/go.mod h1:ob2IJxKrgPT52GcgX759i1sleT07tiKowYBGbczaW48=
+google.golang.org/genproto v0.0.0-20210813162853-db860fec028c/go.mod h1:cFeNkxwySK631ADgubI+/XFU/xp8FD5KIVV4rj8UC5w=
+google.golang.org/genproto v0.0.0-20210821163610-241b8fcbd6c8/go.mod h1:eFjDcFEctNawg4eG61bRv87N7iHBWyVhJu7u1kqDUXY=
+google.golang.org/genproto v0.0.0-20210828152312-66f60bf46e71/go.mod h1:eFjDcFEctNawg4eG61bRv87N7iHBWyVhJu7u1kqDUXY=
+google.golang.org/genproto v0.0.0-20210831024726-fe130286e0e2/go.mod h1:eFjDcFEctNawg4eG61bRv87N7iHBWyVhJu7u1kqDUXY=
+google.golang.org/genproto v0.0.0-20210903162649-d08c68adba83/go.mod h1:eFjDcFEctNawg4eG61bRv87N7iHBWyVhJu7u1kqDUXY=
+google.golang.org/genproto v0.0.0-20210909211513-a8c4777a87af/go.mod h1:eFjDcFEctNawg4eG61bRv87N7iHBWyVhJu7u1kqDUXY=
+google.golang.org/genproto v0.0.0-20210924002016-3dee208752a0/go.mod h1:5CzLGKJ67TSI2B9POpiiyGha0AjJvZIUgRMt1dSmuhc=
+google.golang.org/genproto v0.0.0-20211008145708-270636b82663/go.mod h1:5CzLGKJ67TSI2B9POpiiyGha0AjJvZIUgRMt1dSmuhc=
+google.golang.org/genproto v0.0.0-20211028162531-8db9c33dc351/go.mod h1:5CzLGKJ67TSI2B9POpiiyGha0AjJvZIUgRMt1dSmuhc=
+google.golang.org/genproto v0.0.0-20211118181313-81c1377c94b1/go.mod h1:5CzLGKJ67TSI2B9POpiiyGha0AjJvZIUgRMt1dSmuhc=
+google.golang.org/genproto v0.0.0-20211129164237-f09f9a12af12/go.mod h1:5CzLGKJ67TSI2B9POpiiyGha0AjJvZIUgRMt1dSmuhc=
+google.golang.org/genproto v0.0.0-20211203200212-54befc351ae9/go.mod h1:5CzLGKJ67TSI2B9POpiiyGha0AjJvZIUgRMt1dSmuhc=
+google.golang.org/genproto v0.0.0-20211206160659-862468c7d6e0/go.mod h1:5CzLGKJ67TSI2B9POpiiyGha0AjJvZIUgRMt1dSmuhc=
+google.golang.org/genproto v0.0.0-20211208223120-3a66f561d7aa/go.mod h1:5CzLGKJ67TSI2B9POpiiyGha0AjJvZIUgRMt1dSmuhc=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
 google.golang.org/grpc v1.21.1/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
@ -577,7 +750,15 @@ google.golang.org/grpc v1.34.0/go.mod h1:WotjhfgOW/POjDeRt8vscBtXq+2VjORFy659qA5
 google.golang.org/grpc v1.35.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
 google.golang.org/grpc v1.36.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
 google.golang.org/grpc v1.36.1/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
+google.golang.org/grpc v1.37.0/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
+google.golang.org/grpc v1.37.1/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
 google.golang.org/grpc v1.38.0/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
+google.golang.org/grpc v1.39.0/go.mod h1:PImNr+rS9TWYb2O4/emRugxiyHZ5JyHW5F+RPnDzfrE=
+google.golang.org/grpc v1.39.1/go.mod h1:PImNr+rS9TWYb2O4/emRugxiyHZ5JyHW5F+RPnDzfrE=
+google.golang.org/grpc v1.40.0/go.mod h1:ogyxbiOoUXAkP+4+xa6PZSE9DZgIHtSpzjDTB9KAK34=
+google.golang.org/grpc v1.40.1/go.mod h1:ogyxbiOoUXAkP+4+xa6PZSE9DZgIHtSpzjDTB9KAK34=
+google.golang.org/grpc v1.42.0/go.mod h1:k+4IHHFw41K8+bbowsex27ge2rCb65oeWqe4jJ590SU=
+google.golang.org/grpc/cmd/protoc-gen-go-grpc v1.1.0/go.mod h1:6Kw0yEErY5E/yWrBtf03jp27GLLJujG4z/JK95pnjjw=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
@ -590,13 +771,19 @@ 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/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
+gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
-gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
-gopkg.in/ini.v1 v1.62.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
+gopkg.in/ini.v1 v1.66.2/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.5/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
 gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
--- a/internal/breaker/os_signal.go
+++ b/internal/breaker/os_signal.go
@ -8,7 +8,7 @@ import (
 	"syscall"
 )

-// OSSignals allows to subscribe for system signals.
+// OSSignals allows subscribing for system signals.
 type OSSignals struct {
 	ctx context.Context
 	ch  chan os.Signal
@ -22,7 +22,7 @@ func NewOSSignals(ctx context.Context) OSSignals {
 	}
 }

-// Subscribe for some of system signals (call Stop for stopping).
+// Subscribe for some system signals (call Stop for stopping).
 func (oss *OSSignals) Subscribe(onSignal func(os.Signal), signals ...os.Signal) {
 	if len(signals) == 0 {
 		signals = []os.Signal{os.Interrupt, syscall.SIGINT, syscall.SIGTERM} // default signals
--- a/internal/cli/build/command.go
+++ b/internal/cli/build/command.go
@ -4,6 +4,7 @@ import (
 	"bytes"
 	"os"
 	"path"
+	"sort"
 	"text/template"
 	"time"

@ -19,7 +20,7 @@ type historyItem struct {
 }

 // NewCommand creates `build` command.
-func NewCommand(log *zap.Logger, configFile *string) *cobra.Command { //nolint:funlen,gocognit
+func NewCommand(log *zap.Logger, configFile *string) *cobra.Command { //nolint:funlen,gocognit,gocyclo
 	var (
 		generateIndex bool
 		cfg           *config.Config
@ -52,33 +53,34 @@ func NewCommand(log *zap.Logger, configFile *string) *cobra.Command { //nolint:f
 				return errors.New("wrong arguments count")
 			}

-			log.Info("loading templates")
+			errorPages := tpl.NewErrorPages()

-			templates, err := cfg.LoadTemplates()
-			if err != nil {
+			log.Info("loading templates")
+			if templates, err := cfg.LoadTemplates(); err == nil {
+				if len(templates) > 0 {
+					for templateName, content := range templates {
+						errorPages.AddTemplate(templateName, content)
+					}
+
+					for code, desc := range cfg.Pages {
+						errorPages.AddPage(code, desc.Message, desc.Description)
+					}
+				} else {
+					return errors.New("no loaded templates")
+				}
+			} else {
 				return err
-			} else if len(templates) == 0 {
-				return errors.New("no loaded templates")
 			}

 			log.Debug("the output directory preparing", zap.String("Path", args[0]))
-
-			if err = createDirectory(args[0]); err != nil {
+			if err := createDirectory(args[0]); err != nil {
 				return errors.Wrap(err, "cannot prepare output directory")
 			}

-			codes := make(map[string]tpl.Annotator)
-
-			for code, desc := range cfg.Pages {
-				codes[code] = tpl.Annotator{Message: desc.Message, Description: desc.Description}
-			}
-
-			history := make(map[string][]historyItem, len(templates))
+			history, startedAt := make(map[string][]historyItem), time.Now()

 			log.Info("saving the error pages")
-			startedAt := time.Now()
-
-			if err = tpl.NewErrors(templates, codes).VisitAll(func(template, code string, content []byte) error {
+			if err := errorPages.IteratePages(func(template, code string, content []byte) error {
 				if e := createDirectory(path.Join(args[0], template)); e != nil {
 					return e
 				}
@ -90,27 +92,33 @@ func NewCommand(log *zap.Logger, configFile *string) *cobra.Command { //nolint:f
 				}

 				if _, ok := history[template]; !ok {
-					history[template] = make([]historyItem, 0, len(codes))
+					history[template] = make([]historyItem, 0, len(cfg.Pages))
 				}

 				history[template] = append(history[template], historyItem{
 					Code:    code,
-					Message: codes[code].Message,
+					Message: cfg.Pages[code].Message,
 					Path:    path.Join(template, fileName),
 				})

 				return nil
 			}); err != nil {
-				return nil
+				return err
 			}

 			log.Debug("saved", zap.Duration("duration", time.Since(startedAt)))

 			if generateIndex {
+				for _, h := range history {
+					sort.Slice(h, func(i, j int) bool {
+						return h[i].Code < h[j].Code
+					})
+				}
+
 				log.Info("index file generation")
 				startedAt = time.Now()

-				if err = writeIndexFile(path.Join(args[0], "index.html"), history); err != nil {
+				if err := writeIndexFile(path.Join(args[0], "index.html"), history); err != nil {
 					return err
 				}

--- a/internal/cli/serve/command.go
+++ b/internal/cli/serve/command.go
@ -4,16 +4,16 @@ import (
 	"context"
 	"errors"
 	"os"
+	"sort"
 	"time"

-	"github.com/tarampampam/error-pages/internal/http/handlers/errorpage"
-	"github.com/tarampampam/error-pages/internal/tpl"
-	"go.uber.org/zap"
-
 	"github.com/spf13/cobra"
 	"github.com/tarampampam/error-pages/internal/breaker"
 	"github.com/tarampampam/error-pages/internal/config"
 	appHttp "github.com/tarampampam/error-pages/internal/http"
+	"github.com/tarampampam/error-pages/internal/pick"
+	"github.com/tarampampam/error-pages/internal/tpl"
+	"go.uber.org/zap"
 )

 // NewCommand creates `serve` command.
@ -56,8 +56,6 @@ func NewCommand(ctx context.Context, log *zap.Logger, configFile *string) *cobra
 	return cmd
 }

-const serverShutdownTimeout = 15 * time.Second
-
 // run current command.
 func run(parentCtx context.Context, log *zap.Logger, f flags, cfg *config.Config) error { //nolint:funlen
 	var (
@ -77,35 +75,78 @@ func run(parentCtx context.Context, log *zap.Logger, f flags, cfg *config.Config
 		oss.Stop() // stop system signals listening
 	}()

-	// load templates content
-	templates, loadingErr := cfg.LoadTemplates()
-	if loadingErr != nil {
-		return loadingErr
-	} else if len(templates) == 0 {
-		return errors.New("no loaded templates")
-	}
+	var (
+		errorPages    = tpl.NewErrorPages()
+		templateNames = make([]string, 0) // slice with all possible template names
+	)

-	if f.template.name != "" && f.template.name != errorpage.UseRandom && f.template.name != errorpage.UseRandomOnEachRequest { //nolint:lll
-		if _, found := templates[f.template.name]; !found {
-			return errors.New("requested nonexistent template: " + f.template.name) // requested unknown template
+	log.Debug("Loading templates")
+
+	if templates, err := cfg.LoadTemplates(); err == nil {
+		if len(templates) > 0 {
+			for templateName, content := range templates {
+				errorPages.AddTemplate(templateName, content)
+				templateNames = append(templateNames, templateName)
+			}
+
+			for code, desc := range cfg.Pages {
+				errorPages.AddPage(code, desc.Message, desc.Description)
+			}
+
+			log.Info("Templates loaded", zap.Int("templates", len(templates)), zap.Int("pages", len(cfg.Pages)))
+		} else {
+			return errors.New("no loaded templates")
 		}
+	} else {
+		return err
 	}

-	// burn the error codes map
-	codes := make(map[string]tpl.Annotator)
-	for code, desc := range cfg.Pages {
-		codes[code] = tpl.Annotator{Message: desc.Message, Description: desc.Description}
+	sort.Strings(templateNames) // sorting is important for the first template picking
+
+	var picker *pick.StringsSlice
+
+	switch f.template.name {
+	case useRandomTemplate:
+		log.Info("A random template will be used")
+
+		picker = pick.NewStringsSlice(templateNames, pick.RandomOnce)
+
+	case useRandomTemplateOnEachRequest:
+		log.Info("A random template on EACH request will be used")
+
+		picker = pick.NewStringsSlice(templateNames, pick.RandomEveryTime)
+
+	case "":
+		log.Info("The first template (ordered by name) will be used")
+
+		picker = pick.NewStringsSlice(templateNames, pick.First)
+
+	default:
+		var found bool
+
+		for i := 0; i < len(templateNames); i++ {
+			if templateNames[i] == f.template.name {
+				found = true
+
+				break
+			}
+		}
+
+		if !found {
+			return errors.New("requested nonexistent template: " + f.template.name)
+		}
+
+		log.Info("We will use the requested template", zap.String("name", f.template.name))
+		picker = pick.NewStringsSlice([]string{f.template.name}, pick.First)
 	}

 	// create HTTP server
 	server := appHttp.NewServer(log)

 	// register server routes, middlewares, etc.
-	if err := server.Register(f.template.name, templates, codes); err != nil {
-		return err
-	}
+	server.Register(&errorPages, picker, f.defaultErrorPage, f.defaultHTTPCode)

-	startingErrCh := make(chan error, 1) // channel for server starting error
+	startedAt, startingErrCh := time.Now(), make(chan error, 1) // channel for server starting error

 	// start HTTP server in separate goroutine
 	go func(errCh chan<- error) {
@ -114,7 +155,8 @@ func run(parentCtx context.Context, log *zap.Logger, f flags, cfg *config.Config
 		log.Info("Server starting",
 			zap.String("addr", f.listen.ip),
 			zap.Uint16("port", f.listen.port),
-			zap.String("template name", f.template.name),
+			zap.String("default error page", f.defaultErrorPage),
+			zap.Uint16("default HTTP response code", f.defaultHTTPCode),
 		)

 		if err := server.Start(f.listen.ip, f.listen.port); err != nil {
@ -128,20 +170,12 @@ func run(parentCtx context.Context, log *zap.Logger, f flags, cfg *config.Config
 		return err

 	case <-ctx.Done(): // ..or context cancellation
-		log.Info("Gracefully server stopping")
-
-		stoppedAt := time.Now()
+		log.Info("Gracefully server stopping", zap.Duration("uptime", time.Since(startedAt)))

 		// stop the server using created context above
-		if err := server.Stop(serverShutdownTimeout); err != nil {
-			if errors.Is(err, context.DeadlineExceeded) {
-				log.Error("Server stopping timeout exceeded", zap.Duration("timeout", serverShutdownTimeout))
-			}
-
+		if err := server.Stop(); err != nil {
 			return err
 		}
-
-		log.Debug("Server stopped", zap.Duration("stopping duration", time.Since(stoppedAt)))
 	}

 	return nil
--- a/internal/cli/serve/flags.go
+++ b/internal/cli/serve/flags.go
@ -6,8 +6,6 @@ import (
 	"strconv"
 	"strings"

-	"github.com/tarampampam/error-pages/internal/http/handlers/errorpage"
-
 	"github.com/spf13/pflag"
 	"github.com/tarampampam/error-pages/internal/env"
 )
@ -20,12 +18,21 @@ type flags struct {
 	template struct {
 		name string
 	}
+	defaultErrorPage string
+	defaultHTTPCode  uint16
 }

 const (
-	listenFlagName       = "listen"
-	portFlagName         = "port"
-	templateNameFlagName = "template-name"
+	listenFlagName           = "listen"
+	portFlagName             = "port"
+	templateNameFlagName     = "template-name"
+	defaultErrorPageFlagName = "default-error-page"
+	defaultHTTPCodeFlagName  = "default-http-code"
+)
+
+const (
+	useRandomTemplate              = "random"
+	useRandomTemplateOnEachRequest = "i-said-random"
 )

 func (f *flags) init(flagSet *pflag.FlagSet) {
@ -46,13 +53,25 @@ func (f *flags) init(flagSet *pflag.FlagSet) {
 		templateNameFlagName, "t",
 		"",
 		fmt.Sprintf(
-			"template name (set \"%s\" to use the randomized or \"%s\" to use the randomized template on each request) [$%s]", //nolint:lll
-			errorpage.UseRandom, errorpage.UseRandomOnEachRequest, env.TemplateName,
+			"template name (set \"%s\" to use a randomized or \"%s\" to use a randomized template on each request) [$%s]", //nolint:lll
+			useRandomTemplate, useRandomTemplateOnEachRequest, env.TemplateName,
 		),
 	)
+	flagSet.StringVarP(
+		&f.defaultErrorPage,
+		defaultErrorPageFlagName, "",
+		"404",
+		fmt.Sprintf("default error page [$%s]", env.DefaultErrorPage),
+	)
+	flagSet.Uint16VarP(
+		&f.defaultHTTPCode,
+		defaultHTTPCodeFlagName, "",
+		404, //nolint:gomnd
+		fmt.Sprintf("default HTTP response code [$%s]", env.DefaultHTTPCode),
+	)
 }

-func (f *flags) overrideUsingEnv(flagSet *pflag.FlagSet) (lastErr error) {
+func (f *flags) overrideUsingEnv(flagSet *pflag.FlagSet) (lastErr error) { //nolint:gocognit
 	flagSet.VisitAll(func(flag *pflag.Flag) {
 		// flag was NOT defined using CLI (flags should have maximal priority)
 		if !flag.Changed { //nolint:nestif
@ -75,6 +94,20 @@ func (f *flags) overrideUsingEnv(flagSet *pflag.FlagSet) (lastErr error) {
 				if envVar, exists := env.TemplateName.Lookup(); exists {
 					f.template.name = strings.TrimSpace(envVar)
 				}
+
+			case defaultErrorPageFlagName:
+				if envVar, exists := env.DefaultErrorPage.Lookup(); exists {
+					f.defaultErrorPage = strings.TrimSpace(envVar)
+				}
+
+			case defaultHTTPCodeFlagName:
+				if envVar, exists := env.DefaultHTTPCode.Lookup(); exists {
+					if code, err := strconv.ParseUint(envVar, 10, 16); err == nil { //nolint:gomnd
+						f.defaultHTTPCode = uint16(code)
+					} else {
+						lastErr = fmt.Errorf("wrong default HTTP response code environment variable [%s] value", envVar)
+					}
+				}
 			}
 		}
 	})
@ -87,5 +120,9 @@ func (f *flags) validate() error {
 		return fmt.Errorf("wrong IP address [%s] for listening", f.listen.ip)
 	}

+	if f.defaultHTTPCode > 599 { //nolint:gomnd
+		return fmt.Errorf("wrong default HTTP response code [%d]", f.defaultHTTPCode)
+	}
+
 	return nil
 }
--- a/internal/env/env.go
+++ b/internal/env/env.go
@ -6,10 +6,12 @@ import "os"
 type envVariable string

 const (
-	ListenAddr     envVariable = "LISTEN_ADDR"   // IP address for listening
-	ListenPort     envVariable = "LISTEN_PORT"   // port number for listening
-	TemplateName   envVariable = "TEMPLATE_NAME" // template name
-	ConfigFilePath envVariable = "CONFIG_FILE"   // path to the config file
+	ListenAddr       envVariable = "LISTEN_ADDR"        // IP address for listening
+	ListenPort       envVariable = "LISTEN_PORT"        // port number for listening
+	TemplateName     envVariable = "TEMPLATE_NAME"      // template name
+	ConfigFilePath   envVariable = "CONFIG_FILE"        // path to the config file
+	DefaultErrorPage envVariable = "DEFAULT_ERROR_PAGE" // default error page (code)
+	DefaultHTTPCode  envVariable = "DEFAULT_HTTP_CODE"  // default HTTP response code
 )

 // String returns environment variable name in the string representation.
--- a/internal/env/env_test.go
+++ b/internal/env/env_test.go
@ -12,6 +12,8 @@ func TestConstants(t *testing.T) {
 	assert.Equal(t, "LISTEN_PORT", string(ListenPort))
 	assert.Equal(t, "TEMPLATE_NAME", string(TemplateName))
 	assert.Equal(t, "CONFIG_FILE", string(ConfigFilePath))
+	assert.Equal(t, "DEFAULT_ERROR_PAGE", string(DefaultErrorPage))
+	assert.Equal(t, "DEFAULT_HTTP_CODE", string(DefaultHTTPCode))
 }

 func TestEnvVariable_Lookup(t *testing.T) {
@ -22,6 +24,8 @@ func TestEnvVariable_Lookup(t *testing.T) {
 		{giveEnv: ListenPort},
 		{giveEnv: TemplateName},
 		{giveEnv: ConfigFilePath},
+		{giveEnv: DefaultErrorPage},
+		{giveEnv: DefaultHTTPCode},
 	}

 	for _, tt := range cases {
--- a/internal/http/common/handlers.go
+++ b/internal/http/common/handlers.go
@ -1,35 +0,0 @@
-package common
-
-import (
-	"strings"
-
-	"github.com/valyala/fasthttp"
-)
-
-const internalErrorPattern = `<!DOCTYPE html>
-<html lang="en">
-<head>
-    <meta charset="utf-8">
-    <meta name="viewport" content="width=device-width, initial-scale=1">
-    <meta name="robots" content="noindex, nofollow" />
-    <title>Internal error occurred</title>
-    <style>
-        html,body {background-color: #0e0e0e;color:#fff;font-family:'Nunito',sans-serif;height:100%;margin:0}
-        .message {height:100%;align-items:center;display:flex;justify-content:center;position:relative;font-size:1.4em}
-        img {padding-right: .4em}
-    </style>
-</head>
-<body>
-<div class="message">
-    <img src="https://hsto.org/webt/fs/sx/gt/fssxgtssfg689qxboqvjil5yz8g.png" alt="logo" height="32">
-    <p>{{ message }}</p>
-</div>
-</body>
-</html>`
-
-func HandleInternalHTTPError(ctx *fasthttp.RequestCtx, statusCode int, message string) {
-	ctx.SetStatusCode(statusCode)
-	ctx.SetContentType("text/html; charset=UTF-8")
-
-	_, _ = ctx.WriteString(strings.ReplaceAll(internalErrorPattern, "{{ message }}", message))
-}
--- a/internal/http/common/middlewares.go
+++ b/internal/http/common/middlewares.go
@ -25,6 +25,7 @@ func LogRequest(h fasthttp.RequestHandler, log *zap.Logger) fasthttp.RequestHand
 			zap.String("useragent", ua),
 			zap.String("method", string(ctx.Method())),
 			zap.String("url", string(ctx.RequestURI())),
+			zap.String("referer", string(ctx.Referer())),
 			zap.Int("status_code", ctx.Response.StatusCode()),
 			zap.Bool("connection_close", ctx.Response.ConnectionClose()),
 			zap.Duration("duration", time.Since(startedAt)),
--- a/internal/http/handlers/errorpage/handler.go
+++ b/internal/http/handlers/errorpage/handler.go
@ -1,85 +1,38 @@
 package errorpage

 import (
-	"math/rand"
-	"sort"
-	"time"
-
-	"github.com/pkg/errors"
-	"github.com/tarampampam/error-pages/internal/http/common"
-	"github.com/tarampampam/error-pages/internal/tpl"
 	"github.com/valyala/fasthttp"
 )

-const (
-	UseRandom              = "random"
-	UseRandomOnEachRequest = "i-said-random"
+type (
+	errorsPager interface {
+		// GetPage with passed template name and error code.
+		GetPage(templateName, code string) ([]byte, error)
+	}
+
+	templatePicker interface {
+		// Pick the template name for responding.
+		Pick() string
+	}
 )

 // NewHandler creates handler for error pages serving.
-func NewHandler(
-	templateName string,
-	templates map[string][]byte,
-	codes map[string]tpl.Annotator,
-) (fasthttp.RequestHandler, error) {
-	if len(templates) == 0 {
-		return nil, errors.New("empty templates map")
-	}
-
-	var (
-		rnd           = rand.New(rand.NewSource(time.Now().UnixNano())) //nolint:gosec
-		templateNames = templateTames(templates)
-	)
-
-	if templateName == "" { // on empty template name
-		templateName = templateNames[0] // pick the first
-	} else if templateName == UseRandom { // on "random" template name
-		templateName = templateNames[rnd.Intn(len(templateNames))] // pick the randomized
-	}
-
-	if _, found := templates[templateName]; !found && templateName != UseRandomOnEachRequest {
-		return nil, errors.New("wrong template name passed")
-	}
-
-	var pages = tpl.NewErrors(templates, codes)
-
+func NewHandler(e errorsPager, p templatePicker) fasthttp.RequestHandler {
 	return func(ctx *fasthttp.RequestCtx) {
-		var useTemplate = templateName // default
-
-		if templateName == UseRandomOnEachRequest {
-			useTemplate = templateNames[rnd.Intn(len(templateNames))] // pick the randomized
-		}
+		ctx.SetContentType("text/plain; charset=utf-8") // default content type

 		if code, ok := ctx.UserValue("code").(string); ok {
-			if content, err := pages.Get(useTemplate, code); err == nil {
+			if content, err := e.GetPage(p.Pick(), code); err == nil {
 				ctx.SetStatusCode(fasthttp.StatusOK)
 				ctx.SetContentType("text/html; charset=utf-8")
 				_, _ = ctx.Write(content)
 			} else {
-				common.HandleInternalHTTPError(
-					ctx,
-					fasthttp.StatusNotFound,
-					"requested code not available: "+err.Error(),
-				)
+				ctx.SetStatusCode(fasthttp.StatusNotFound)
+				_, _ = ctx.WriteString("requested code not available: " + err.Error()) // TODO customize the output?
 			}
 		} else { // will never happen
-			common.HandleInternalHTTPError(
-				ctx,
-				fasthttp.StatusInternalServerError,
-				"cannot extract requested code from the request",
-			)
+			ctx.SetStatusCode(fasthttp.StatusInternalServerError)
+			_, _ = ctx.WriteString("cannot extract requested code from the request") // TODO customize the output?
 		}
-	}, nil
-}
-
-func templateTames(templates map[string][]byte) []string {
-	var templateNames = make([]string, 0, len(templates))
-
-	for name := range templates {
-		templateNames = append(templateNames, name)
 	}
-
-	sort.Strings(templateNames)
-
-	return templateNames
 }
--- a/internal/http/handlers/index/handler.go
+++ b/internal/http/handlers/index/handler.go
@ -0,0 +1,41 @@
+package index
+
+import (
+	"github.com/valyala/fasthttp"
+)
+
+type (
+	errorsPager interface {
+		// GetPage with passed template name and error code.
+		GetPage(templateName, code string) ([]byte, error)
+	}
+
+	templatePicker interface {
+		// Pick the template name for responding.
+		Pick() string
+	}
+)
+
+// NewHandler creates handler for the index page serving.
+func NewHandler(
+	e errorsPager,
+	p templatePicker,
+	defaultPageCode string,
+	defaultHTTPCode uint16,
+) fasthttp.RequestHandler {
+	return func(ctx *fasthttp.RequestCtx) {
+		content, err := e.GetPage(p.Pick(), defaultPageCode)
+
+		if err == nil {
+			ctx.SetContentType("text/html; charset=utf-8")
+			ctx.SetStatusCode(int(defaultHTTPCode))
+			_, _ = ctx.Write(content)
+
+			return
+		}
+
+		ctx.SetContentType("text/plain; charset=utf-8")
+		ctx.SetStatusCode(fasthttp.StatusNotAcceptable)
+		_, _ = ctx.WriteString("default page code " + defaultPageCode + " is not available: " + err.Error())
+	}
+}
--- a/internal/http/handlers/index/handler_test.go
+++ b/internal/http/handlers/index/handler_test.go
@ -1,4 +1,4 @@
-package common_test
+package index_test

 import "testing"

--- a/internal/http/handlers/notfound/handler.go
+++ b/internal/http/handlers/notfound/handler.go
@ -0,0 +1,14 @@
+package notfound
+
+import (
+	"github.com/valyala/fasthttp"
+)
+
+// NewHandler creates handler missing requests handling.
+func NewHandler() fasthttp.RequestHandler {
+	return func(ctx *fasthttp.RequestCtx) {
+		ctx.SetContentType("text/plain; charset=utf-8")
+		ctx.SetStatusCode(fasthttp.StatusNotFound)
+		_, _ = ctx.WriteString("Wrong request URL. Error pages are available at the following URLs: /{code}.html")
+	}
+}
--- a/internal/http/handlers/notfound/handler_test.go
+++ b/internal/http/handlers/notfound/handler_test.go
@ -0,0 +1,7 @@
+package notfound_test
+
+import "testing"
+
+func TestNothing(t *testing.T) {
+	t.Skip("tests for this package have not been implemented yet")
+}
--- a/internal/http/server.go
+++ b/internal/http/server.go
@ -1,7 +1,6 @@
 package http

 import (
-	"context"
 	"strconv"
 	"time"

@ -10,8 +9,9 @@ import (
 	"github.com/tarampampam/error-pages/internal/http/common"
 	errorpageHandler "github.com/tarampampam/error-pages/internal/http/handlers/errorpage"
 	healthzHandler "github.com/tarampampam/error-pages/internal/http/handlers/healthz"
+	indexHandler "github.com/tarampampam/error-pages/internal/http/handlers/index"
+	notfoundHandler "github.com/tarampampam/error-pages/internal/http/handlers/notfound"
 	versionHandler "github.com/tarampampam/error-pages/internal/http/handlers/version"
-	"github.com/tarampampam/error-pages/internal/tpl"
 	"github.com/tarampampam/error-pages/internal/version"
 	"github.com/valyala/fasthttp"
 	"go.uber.org/zap"
@ -23,9 +23,9 @@ type Server struct {
 }

 const (
-	defaultWriteTimeout = time.Second * 7
-	defaultReadTimeout  = time.Second * 7
-	defaultIdleTimeout  = time.Second * 15
+	defaultWriteTimeout = time.Second * 4
+	defaultReadTimeout  = time.Second * 4
+	defaultIdleTimeout  = time.Second * 6
 )

 func NewServer(log *zap.Logger) Server {
@ -52,55 +52,33 @@ func (s *Server) Start(ip string, port uint16) error {
 	return s.fast.ListenAndServe(ip + ":" + strconv.Itoa(int(port)))
 }

+type (
+	errorsPager interface {
+		// GetPage with passed template name and error code.
+		GetPage(templateName, code string) ([]byte, error)
+	}
+
+	templatePicker interface {
+		// Pick the template name for responding.
+		Pick() string
+	}
+)
+
 // Register server routes, middlewares, etc.
 // Router docs: <https://github.com/fasthttp/router>
 func (s *Server) Register(
-	templateName string,
-	templates map[string][]byte,
-	codes map[string]tpl.Annotator,
-) error {
-	s.router.GET("/", func(ctx *fasthttp.RequestCtx) {
-		common.HandleInternalHTTPError(
-			ctx,
-			fasthttp.StatusNotFound,
-			"Hi there! Error pages are available at the following URLs: /{code}.html",
-		)
-	})
-
-	s.router.NotFound = func(ctx *fasthttp.RequestCtx) {
-		common.HandleInternalHTTPError(
-			ctx,
-			fasthttp.StatusNotFound,
-			"Wrong request URL. Error pages are available at the following URLs: /{code}.html",
-		)
-	}
-
+	errorsPager errorsPager,
+	templatePicker templatePicker,
+	defaultPageCode string,
+	defaultHTTPCode uint16,
+) {
+	s.router.GET("/", indexHandler.NewHandler(errorsPager, templatePicker, defaultPageCode, defaultHTTPCode))
 	s.router.GET("/version", versionHandler.NewHandler(version.Version()))
 	s.router.ANY("/health/live", healthzHandler.NewHandler(checkers.NewLiveChecker()))
+	s.router.GET("/{code}.html", errorpageHandler.NewHandler(errorsPager, templatePicker))

-	if h, err := errorpageHandler.NewHandler(templateName, templates, codes); err != nil {
-		return err
-	} else {
-		s.router.GET("/{code}.html", h)
-	}
-
-	return nil
+	s.router.NotFound = notfoundHandler.NewHandler()
 }

 // Stop server.
-func (s *Server) Stop(timeout time.Duration) error {
-	ctx, cancel := context.WithTimeout(context.Background(), timeout) // TODO replace with simple time.After
-	defer cancel()
-
-	ch := make(chan error, 1) // channel for server stopping error
-
-	go func() { defer close(ch); ch <- s.fast.Shutdown() }()
-
-	select {
-	case err := <-ch:
-		return err
-
-	case <-ctx.Done():
-		return ctx.Err()
-	}
-}
+func (s *Server) Stop() error { return s.fast.Shutdown() }
--- a/internal/pick/strings_slice.go
+++ b/internal/pick/strings_slice.go
@ -0,0 +1,64 @@
+package pick
+
+import (
+	"math/rand"
+	"time"
+)
+
+type pickMode byte
+
+const (
+	First           pickMode = 1 + iota // Always pick the first element
+	RandomOnce                          // Pick random element once (any future Pick calls will return the same element)
+	RandomEveryTime                     // Always Pick the random element
+)
+
+type StringsSlice struct {
+	items       []string
+	mode        pickMode
+	lastUsedIdx int        // -1 when unset, needed for RandomOnce mode
+	rnd         *rand.Rand // will be nil for the First mode
+}
+
+// NewStringsSlice creates new StringsSlice.
+func NewStringsSlice(items []string, mode pickMode) *StringsSlice {
+	var rnd *rand.Rand
+
+	if mode != First {
+		rnd = rand.New(rand.NewSource(time.Now().UnixNano())) //nolint:gosec
+	}
+
+	return &StringsSlice{
+		items:       items,
+		mode:        mode,
+		lastUsedIdx: -1,
+		rnd:         rnd,
+	}
+}
+
+// Pick an element from the strings slice.
+func (s *StringsSlice) Pick() string {
+	if l := len(s.items); l == 0 {
+		return ""
+	} else if l == 1 {
+		return s.items[0]
+	}
+
+	switch s.mode {
+	case First:
+		return s.items[0]
+
+	case RandomOnce:
+		if s.lastUsedIdx == -1 {
+			s.lastUsedIdx = s.rnd.Intn(len(s.items))
+		}
+
+		return s.items[s.lastUsedIdx]
+
+	case RandomEveryTime:
+		return s.items[s.rnd.Intn(len(s.items))]
+
+	default:
+		panic("pick: unsupported mode")
+	}
+}
--- a/internal/pick/strings_slice_test.go
+++ b/internal/pick/strings_slice_test.go
@ -0,0 +1,102 @@
+package pick_test
+
+import (
+	"math/rand"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/tarampampam/error-pages/internal/pick"
+)
+
+func TestStringsSlice_Pick_First(t *testing.T) {
+	for name, items := range map[string][]string{
+		"0 item":  {},
+		"1 item":  {"foo"},
+		"3 items": {"foo", "bar", "baz"},
+	} {
+		t.Run(name, func(t *testing.T) {
+			p := pick.NewStringsSlice(items, pick.First)
+
+			for i := 0; i < 100; i++ {
+				if len(items) == 0 {
+					assert.Equal(t, "", p.Pick())
+				} else {
+					assert.Equal(t, "foo", p.Pick())
+				}
+			}
+		})
+	}
+}
+
+func TestStringsSlice_Pick_RandomOnce(t *testing.T) {
+	p := pick.NewStringsSlice([]string{}, pick.RandomOnce)
+	assert.Equal(t, "", p.Pick())
+
+	p = pick.NewStringsSlice([]string{"foo"}, pick.RandomOnce)
+	assert.Equal(t, "foo", p.Pick())
+
+	dataSet := randomStringsSlice(t, 2048) // if this test will fail - Increase this value
+	p = pick.NewStringsSlice(dataSet, pick.RandomOnce)
+	picked := p.Pick()
+
+	assert.NotEqual(t, dataSet[0], p.Pick())
+
+	for i := 0; i < 32; i++ {
+		assert.Equal(t, picked, p.Pick())
+	}
+}
+
+func TestStringsSlice_Pick_RandomEveryTime(t *testing.T) {
+	p := pick.NewStringsSlice([]string{}, pick.RandomEveryTime)
+	assert.Equal(t, "", p.Pick())
+
+	p = pick.NewStringsSlice([]string{"foo"}, pick.RandomEveryTime)
+	assert.Equal(t, "foo", p.Pick())
+
+	dataSet := randomStringsSlice(t, 2048) // if this test will fail - Increase this value
+	p = pick.NewStringsSlice(dataSet, pick.RandomEveryTime)
+
+	lastPicked := p.Pick()
+
+	for i := 0; i < 32; i++ {
+		picked := p.Pick()
+
+		assert.NotEqual(t, lastPicked, picked)
+		lastPicked = picked
+	}
+}
+
+func TestStringsSlice_Pick_UnsupportedMode(t *testing.T) {
+	p := pick.NewStringsSlice([]string{}, 255)
+	assert.Equal(t, "", p.Pick())
+
+	p = pick.NewStringsSlice([]string{"foo"}, 255)
+	assert.Equal(t, "foo", p.Pick())
+
+	p = pick.NewStringsSlice([]string{"foo", "bar"}, 255)
+
+	assert.Panics(t, func() { p.Pick() })
+}
+
+func randomStringsSlice(t *testing.T, itemsCount int) []string {
+	t.Helper()
+
+	var (
+		rnd     = rand.New(rand.NewSource(time.Now().UnixNano())) //nolint:gosec
+		items   = make([]string, itemsCount)
+		letters = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_-+=")
+	)
+
+	for i := 0; i < len(items); i++ {
+		b := make([]rune, 32)
+
+		for j := range b {
+			b[j] = letters[rnd.Intn(len(letters))]
+		}
+
+		items[i] = string(b)
+	}
+
+	return items
+}
--- a/internal/tpl/error_pages.go
+++ b/internal/tpl/error_pages.go
@ -0,0 +1,136 @@
+package tpl
+
+import (
+	"bytes"
+	"sync"
+
+	"github.com/pkg/errors"
+)
+
+type (
+	// ErrorPages is a error page templates generator.
+	ErrorPages struct {
+		mu        sync.RWMutex
+		templates map[string][]byte            // map[template_name]raw_content
+		pages     map[string]*pageProperties   // map[page_code]props
+		state     map[string]map[string][]byte // map[template_name]map[page_code]content
+	}
+
+	pageProperties struct {
+		message, description string
+	}
+)
+
+var (
+	ErrUnknownTemplate = errors.New("unknown template")  // unknown template
+	ErrUnknownPageCode = errors.New("unknown page code") // unknown page code
+)
+
+// NewErrorPages creates ErrorPages templates generator.
+func NewErrorPages() ErrorPages {
+	return ErrorPages{
+		templates: make(map[string][]byte),
+		pages:     make(map[string]*pageProperties),
+		state:     make(map[string]map[string][]byte),
+	}
+}
+
+// AddTemplate to the generator. Template can contain the special placeholders for the error code, message and
+// description:
+//	{{ code }} - for the code
+//	{{ message }} - for the message
+//	{{ description }} - for the description
+func (e *ErrorPages) AddTemplate(templateName string, content []byte) {
+	e.mu.Lock()
+	defer e.mu.Unlock()
+
+	e.templates[templateName] = content
+	e.state[templateName] = make(map[string][]byte)
+
+	for code, props := range e.pages { // update the state
+		e.state[templateName][code] = e.makeReplaces(content, code, props.message, props.description)
+	}
+}
+
+// AddPage with the passed code, message and description. This page will ba available for the all templates.
+func (e *ErrorPages) AddPage(code, message, description string) {
+	e.mu.Lock()
+	defer e.mu.Unlock()
+
+	e.pages[code] = &pageProperties{message, description}
+
+	for templateName, content := range e.templates { // update the state
+		e.state[templateName][code] = e.makeReplaces(content, code, message, description)
+	}
+}
+
+// GetPage with passed template name and error code.
+func (e *ErrorPages) GetPage(templateName, code string) (content []byte, err error) {
+	e.mu.RLock()
+	defer e.mu.RUnlock()
+
+	if pages, templateExists := e.state[templateName]; templateExists {
+		if c, pageExists := pages[code]; pageExists {
+			content = c
+		} else {
+			err = ErrUnknownPageCode
+		}
+	} else {
+		err = ErrUnknownTemplate
+	}
+
+	return
+}
+
+// IteratePages will call the passed function for each page and template.
+func (e *ErrorPages) IteratePages(fn func(template, code string, content []byte) error) error {
+	e.mu.RLock()
+	defer e.mu.RUnlock()
+
+	for tplName, codes := range e.state {
+		for code, content := range codes {
+			if err := fn(tplName, code, content); err != nil {
+				return err
+			}
+		}
+	}
+
+	return nil
+}
+
+const (
+	tknCode byte = iota + 1
+	tknMessage
+	tknDescription
+)
+
+var tknSets = map[byte][][]byte{ //nolint:gochecknoglobals
+	tknCode:        {[]byte("{{code}}"), []byte("{{ code }}")},
+	tknMessage:     {[]byte("{{message}}"), []byte("{{ message }}")},
+	tknDescription: {[]byte("{{description}}"), []byte("{{ description }}")},
+}
+
+func (e *ErrorPages) makeReplaces(where []byte, code, message, description string) []byte {
+	for tkn, set := range tknSets {
+		var replaceWith []byte
+
+		switch tkn {
+		case tknCode:
+			replaceWith = []byte(code)
+		case tknMessage:
+			replaceWith = []byte(message)
+		case tknDescription:
+			replaceWith = []byte(description)
+		default:
+			panic("tpl: unsupported token") // this is like a fuse, will never occur during normal usage
+		}
+
+		if len(replaceWith) > 0 {
+			for i := 0; i < len(set); i++ {
+				where = bytes.ReplaceAll(where, set[i], replaceWith)
+			}
+		}
+	}
+
+	return where
+}
--- a/internal/tpl/error_pages_test.go
+++ b/internal/tpl/error_pages_test.go
@ -0,0 +1,132 @@
+package tpl_test
+
+import (
+	"errors"
+	"sync"
+	"testing"
+
+	"github.com/tarampampam/error-pages/internal/tpl"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestErrorPages_GetPage(t *testing.T) {
+	e := tpl.NewErrorPages()
+
+	e.AddTemplate("foo", []byte("{{code}}: {{ message }} {{description}}"))
+	e.AddPage("200", "ok", "all is ok")
+	e.AddTemplate("bar", []byte("{{ code }} _ {{message}} ({{ description }})"))
+	e.AddPage("201", "lorem", "ipsum")
+
+	content, err := e.GetPage("foo", "200")
+	assert.NoError(t, err)
+	assert.Equal(t, "200: ok all is ok", string(content))
+
+	content, err = e.GetPage("foo", "201")
+	assert.NoError(t, err)
+	assert.Equal(t, "201: lorem ipsum", string(content))
+
+	content, err = e.GetPage("bar", "200")
+	assert.NoError(t, err)
+	assert.Equal(t, "200 _ ok (all is ok)", string(content))
+
+	content, err = e.GetPage("bar", "201")
+	assert.NoError(t, err)
+	assert.Equal(t, "201 _ lorem (ipsum)", string(content))
+
+	content, err = e.GetPage("foo", "666")
+	assert.ErrorIs(t, err, tpl.ErrUnknownPageCode)
+	assert.Nil(t, content)
+
+	content, err = e.GetPage("baz", "200")
+	assert.ErrorIs(t, err, tpl.ErrUnknownTemplate)
+	assert.Nil(t, content)
+}
+
+func TestErrorPages_GetPage_Concurrent(t *testing.T) {
+	e := tpl.NewErrorPages()
+
+	init := func() {
+		e.AddTemplate("foo", []byte("{{ code }}: {{ message }} {{ description }}"))
+		e.AddPage("200", "ok", "all is ok")
+		e.AddPage("201", "lorem", "ipsum")
+	}
+
+	var wg sync.WaitGroup
+
+	init()
+
+	for i := 0; i < 1234; i++ {
+		wg.Add(2)
+
+		go func() {
+			defer wg.Done()
+
+			init() // make re-initialization
+		}()
+
+		go func() {
+			defer wg.Done()
+
+			content, err := e.GetPage("foo", "200")
+			assert.NoError(t, err)
+			assert.Equal(t, "200: ok all is ok", string(content))
+
+			content, err = e.GetPage("foo", "201")
+			assert.NoError(t, err)
+			assert.Equal(t, "201: lorem ipsum", string(content))
+
+			content, err = e.GetPage("foo", "666")
+			assert.Error(t, err)
+			assert.Nil(t, content)
+
+			content, err = e.GetPage("bar", "200")
+			assert.Error(t, err)
+			assert.Nil(t, content)
+		}()
+	}
+
+	wg.Wait()
+}
+
+func TestErrorPages_IteratePages(t *testing.T) {
+	e := tpl.NewErrorPages()
+
+	e.AddTemplate("foo", []byte("{{ code }}: {{ message }} {{ description }}"))
+	e.AddTemplate("bar", []byte("{{ code }}: {{ message }} {{ description }}"))
+	e.AddPage("200", "ok", "all is ok")
+	e.AddPage("400", "Bad Request", "")
+
+	visited := make(map[string]map[string]bool) // map[template]codes
+
+	assert.NoError(t, e.IteratePages(func(template, code string, content []byte) error {
+		if _, ok := visited[template]; !ok {
+			visited[template] = make(map[string]bool)
+		}
+
+		visited[template][code] = true
+
+		assert.NotNil(t, content)
+
+		return nil
+	}))
+
+	assert.Len(t, visited, 2)
+	assert.Len(t, visited["foo"], 2)
+	assert.True(t, visited["foo"]["200"])
+	assert.True(t, visited["foo"]["400"])
+	assert.Len(t, visited["bar"], 2)
+	assert.True(t, visited["bar"]["200"])
+	assert.True(t, visited["bar"]["400"])
+}
+
+func TestErrorPages_IteratePages_WillReturnTheError(t *testing.T) {
+	e := tpl.NewErrorPages()
+
+	e.AddTemplate("foo", []byte("{{ code }}: {{ message }} {{ description }}"))
+	e.AddPage("200", "ok", "all is ok")
+
+	assert.EqualError(t, e.IteratePages(func(template, code string, content []byte) error {
+		return errors.New("foo error")
+	}), "foo error")
+}
--- a/internal/tpl/errors.go
+++ b/internal/tpl/errors.go
@ -1,102 +0,0 @@
-package tpl
-
-import (
-	"errors"
-	"sync"
-)
-
-// Annotator allows to annotate error code.
-type Annotator struct {
-	Message     string
-	Description string
-}
-
-// Errors is a "cached storage" for the rendered error pages for the different templates and codes.
-type Errors struct {
-	templates map[string][]byte
-	codes     map[string]Annotator
-
-	cacheMu sync.RWMutex
-	cache   map[string]map[string][]byte // map[template]map[code]content
-}
-
-// NewErrors creates new Errors.
-func NewErrors(templates map[string][]byte, codes map[string]Annotator) *Errors {
-	return &Errors{
-		templates: templates,
-		codes:     codes,
-		cache:     make(map[string]map[string][]byte),
-	}
-}
-
-func (e *Errors) existsInCache(template, code string) ([]byte, bool) {
-	e.cacheMu.RLock()
-	defer e.cacheMu.RUnlock()
-
-	if codes, tplOk := e.cache[template]; tplOk {
-		if content, codeOk := codes[code]; codeOk {
-			return content, true
-		}
-	}
-
-	return nil, false
-}
-
-func (e *Errors) putInCache(template, code string) error {
-	if _, ok := e.templates[template]; !ok {
-		return errors.New("template \"" + template + "\" does not exists")
-	}
-
-	if _, ok := e.codes[code]; !ok {
-		return errors.New("code \"" + code + "\" does not exists")
-	}
-
-	e.cacheMu.Lock()
-	defer e.cacheMu.Unlock()
-
-	if _, ok := e.cache[template]; !ok {
-		e.cache[template] = make(map[string][]byte)
-	}
-
-	e.cache[template][code] = Replace(e.templates[template], Replaces{
-		Code:        code,
-		Message:     e.codes[code].Message,
-		Description: e.codes[code].Description,
-	})
-
-	return nil
-}
-
-// Get the rendered error page content.
-func (e *Errors) Get(template, code string) ([]byte, error) {
-	if content, ok := e.existsInCache(template, code); ok {
-		return content, nil
-	}
-
-	if err := e.putInCache(template, code); err != nil {
-		return nil, err
-	}
-
-	e.cacheMu.RLock()
-	defer e.cacheMu.RUnlock()
-
-	return e.cache[template][code], nil
-}
-
-// VisitAll allows to iterate all possible error pages and templates.
-func (e *Errors) VisitAll(fn func(template, code string, content []byte) error) error {
-	for tpl := range e.templates {
-		for code := range e.codes {
-			content, err := e.Get(tpl, code)
-			if err != nil {
-				return err // will never happen
-			}
-
-			if err = fn(tpl, code, content); err != nil {
-				return err
-			}
-		}
-	}
-
-	return nil
-}
--- a/internal/tpl/errors_test.go
+++ b/internal/tpl/errors_test.go
@ -1,106 +0,0 @@
-package tpl_test
-
-import (
-	"errors"
-	"sync"
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-	"github.com/tarampampam/error-pages/internal/tpl"
-)
-
-func TestErrors_Get(t *testing.T) {
-	e := tpl.NewErrors(
-		map[string][]byte{"foo": []byte("{{ code }}: {{ message }} {{ description }}")},
-		map[string]tpl.Annotator{"200": {"ok", "all is ok"}},
-	)
-
-	content, err := e.Get("foo", "200")
-	assert.NoError(t, err)
-	assert.Equal(t, "200: ok all is ok", string(content))
-
-	content, err = e.Get("foo", "666")
-	assert.EqualError(t, err, "code \"666\" does not exists")
-	assert.Nil(t, content)
-
-	content, err = e.Get("bar", "200")
-	assert.EqualError(t, err, "template \"bar\" does not exists")
-	assert.Nil(t, content)
-}
-
-func TestErrors_GetConcurrent(t *testing.T) {
-	e := tpl.NewErrors(
-		map[string][]byte{"foo": []byte("{{ code }}: {{ message }} {{ description }}")},
-		map[string]tpl.Annotator{"200": {"ok", "all is ok"}},
-	)
-
-	var wg sync.WaitGroup
-
-	for i := 0; i < 1234; i++ {
-		wg.Add(1)
-
-		go func() {
-			defer wg.Done()
-
-			content, err := e.Get("foo", "200")
-			assert.NoError(t, err)
-			assert.Equal(t, "200: ok all is ok", string(content))
-
-			content, err = e.Get("foo", "666")
-			assert.Error(t, err)
-			assert.Nil(t, content)
-		}()
-	}
-
-	wg.Wait()
-}
-
-func TestErrors_VisitAll(t *testing.T) {
-	e := tpl.NewErrors(
-		map[string][]byte{
-			"foo": []byte("{{ code }}: {{ message }} {{ description }}"),
-			"bar": []byte("{{ code }}: {{ message }} {{ description }}"),
-		},
-		map[string]tpl.Annotator{
-			"200": {"ok", "all is ok"},
-			"400": {"Bad Request", "The server did not understand the request"},
-		},
-	)
-
-	visited := make(map[string]map[string]bool) // map[template]codes
-
-	assert.NoError(t, e.VisitAll(func(template, code string, content []byte) error {
-		if _, ok := visited[template]; !ok {
-			visited[template] = make(map[string]bool)
-		}
-
-		visited[template][code] = true
-
-		assert.NotNil(t, content)
-
-		return nil
-	}))
-
-	assert.Len(t, visited, 2)
-	assert.Len(t, visited["foo"], 2)
-	assert.True(t, visited["foo"]["200"])
-	assert.True(t, visited["foo"]["400"])
-	assert.Len(t, visited["bar"], 2)
-	assert.True(t, visited["bar"]["200"])
-	assert.True(t, visited["bar"]["400"])
-}
-
-func TestErrors_VisitAllWillReturnTheError(t *testing.T) {
-	e := tpl.NewErrors(
-		map[string][]byte{
-			"foo": []byte("{{ code }}: {{ message }} {{ description }}"),
-		},
-		map[string]tpl.Annotator{
-			"200": {"ok", "all is ok"},
-		},
-	)
-
-	assert.EqualError(t, e.VisitAll(func(template, code string, content []byte) error {
-		return errors.New("foo error")
-	}), "foo error")
-}
--- a/internal/tpl/replace.go
+++ b/internal/tpl/replace.go
@ -1,47 +0,0 @@
-package tpl
-
-import "bytes"
-
-type Replaces struct {
-	Code        string
-	Message     string
-	Description string
-}
-
-const (
-	tknCode byte = iota + 1
-	tknMessage
-	tknDescription
-)
-
-var tknSets = map[byte][][]byte{ //nolint:gochecknoglobals
-	tknCode:        {[]byte("{{code}}"), []byte("{{ code }}")},
-	tknMessage:     {[]byte("{{message}}"), []byte("{{ message }}")},
-	tknDescription: {[]byte("{{description}}"), []byte("{{ description }}")},
-}
-
-// Replace found tokens in the incoming slice with passed tokens.
-func Replace(in []byte, re Replaces) []byte {
-	for tkn, set := range tknSets {
-		var replaceWith []byte
-
-		switch tkn {
-		case tknCode:
-			replaceWith = []byte(re.Code)
-		case tknMessage:
-			replaceWith = []byte(re.Message)
-		case tknDescription:
-			replaceWith = []byte(re.Description)
-		default:
-			panic("tpl: unsupported token")
-		}
-
-		if len(replaceWith) > 0 {
-			for i := 0; i < len(set); i++ {
-				in = bytes.ReplaceAll(in, set[i], replaceWith)
-			}
-		}
-	}
-
-	return in
-}
--- a/internal/tpl/replace_test.go
+++ b/internal/tpl/replace_test.go
@ -1,66 +0,0 @@
-package tpl_test
-
-import (
-	"fmt"
-	"testing"
-
-	"github.com/stretchr/testify/assert"
-	"github.com/tarampampam/error-pages/internal/tpl"
-)
-
-func ExampleReplace() {
-	var in = []byte("{{ code }}: {{message}} ({{ description }})")
-
-	fmt.Println(string(tpl.Replace(in, tpl.Replaces{
-		Code:        "400",
-		Message:     "Bad Request",
-		Description: "The server did not understand the request",
-	})))
-
-	// Output:
-	// 400: Bad Request (The server did not understand the request)
-}
-
-func TestReplace(t *testing.T) {
-	for name, tt := range map[string]struct {
-		giveIn     []byte
-		giveRe     tpl.Replaces
-		wantResult []byte
-	}{
-		"common": {
-			giveIn: []byte("-- {{ code }} {{code}} __ {{message}} {{ description }} "),
-			giveRe: tpl.Replaces{
-				Code:        "123",
-				Message:     "message",
-				Description: "desc",
-			},
-			wantResult: []byte("-- 123 123 __ message desc "),
-		},
-		"alpha and underline in the code": {
-			giveIn: []byte("\t{{ code }}\t"),
-			giveRe: tpl.Replaces{
-				Code: "  qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM_  ",
-			},
-			wantResult: []byte("\t  qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM_  \t"),
-		},
-	} {
-		tt := tt
-
-		t.Run(name, func(t *testing.T) {
-			assert.Equal(t, tt.wantResult, tpl.Replace(tt.giveIn, tt.giveRe))
-		})
-	}
-}
-
-func BenchmarkReplace(b *testing.B) {
-	b.ReportAllocs()
-	b.ResetTimer()
-
-	for i := 0; i < b.N; i++ {
-		tpl.Replace([]byte("-- {{ code }} {{code}} __ {{message}} {{ description }} "), tpl.Replaces{
-			Code:        "123",
-			Message:     "message",
-			Description: "desc",
-		})
-	}
-}
--- a/templates/cats.html
+++ b/templates/cats.html
@ -0,0 +1,43 @@
+<!DOCTYPE html>
+<!--
+    Error {{ code }}: {{ message }}
+    Description: {{ description }}
+-->
+<html lang="en">
+<head>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <meta name="robots" content="noindex, nofollow" />
+    <title>{{ message }}</title>
+    <style>
+        html, body {
+            margin: 0;
+            background-color: #000;
+            color: #aaa;
+            overflow: hidden;
+        }
+
+        .centered {
+            height: 100vh;
+            align-items: center;
+            display: flex;
+            justify-content: center
+        }
+
+        .centered img {
+            max-width: 750px;
+            width: 100%;
+        }
+    </style>
+</head>
+<body>
+    <div class="centered">
+        <!-- Pictures provider: <https://http.cat/> -->
+        <img src="https://http.cat/{{ code }}.jpg" alt="{{ message }}">
+    </div>
+</body>
+<!--
+    Error {{ code }}: {{ message }}
+    Description: {{ description }}
+-->
+</html>
Author	SHA1	Message	Date
Paramtamtam	83720999d8	Changelog updated	2022-01-03 21:52:47 +05:00
Paramtamtam	79bbf3d71e	Flag `--default-http-code` for the `serve` subcommand added (#44 )	2022-01-03 21:51:30 +05:00
dependabot[bot]	1dec69d726	Bump golang from 1.17.3-alpine to 1.17.5-alpine (#42 )	2022-01-03 15:40:05 +00:00
dependabot[bot]	ef2db68430	Bump github.com/spf13/cobra from 1.2.1 to 1.3.0 (#43 )	2022-01-02 07:25:37 +00:00
dependabot[bot]	e6f3250286	Bump golang from 1.17.2-alpine to 1.17.3-alpine (#38 )	2021-12-02 11:08:52 +00:00
dependabot[bot]	ca56f1dd07	Bump github.com/a8m/envsubst from 1.2.0 to 1.3.0 (#39 )	2021-12-02 04:51:26 +00:00
dependabot[bot]	6bd973a803	Bump golang from 1.17.1-alpine to 1.17.2-alpine (#34 )	2021-11-02 06:33:04 +00:00
dependabot[bot]	49dd703e12	Bump github.com/fasthttp/router from 1.4.3 to 1.4.4 (#36 )	2021-11-02 06:32:13 +00:00
Felix	0f27441225	Updated: images to the latest version (#32 )	2021-10-20 18:32:56 +05:00
Paramtamtam	97d76ddca8	Update README.md	2021-10-15 14:48:52 +05:00
Paramtamtam	891d491cdb	Index page codes now sorted	2021-10-15 11:06:10 +05:00
Paramtamtam	2a1fb0eddf	Changelog updated	2021-10-15 10:36:48 +05:00
Paramtamtam	5c25fbe2c4	Cats template updated	2021-10-15 10:32:31 +05:00
Kacper	e3e618d3cf	Add cat template (#31 )	2021-10-15 09:55:28 +05:00
Paramtamtam	e2489a2487	Changelog updated	2021-10-06 22:38:26 +05:00
Paramtamtam	bb17027cc9	Allow to set default error page (#30 )	2021-10-06 22:38:00 +05:00
dependabot[bot]	6b17d3eb7d	Bump github.com/fatih/color from 1.7.0 to 1.13.0 (#28 )	2021-10-01 12:10:23 +00:00
dependabot[bot]	c5f11eff8b	Bump github.com/pkg/errors from 0.8.1 to 0.9.1 (#27 )	2021-10-01 11:58:48 +00:00
Paramtamtam	b36bc5e47d	Dependabot config added	2021-10-01 16:46:35 +05:00