Whoami Go Web Server

Simple Go web server based on net/http library which returns information about web server and HTTP context.

Can be used for development, testing and debugging purposes.

Install

Docker

To start web server in docker container run:

docker run --rm --name=whoami -p 80:8080 andymarkow/whoami

Make a HTTP request:

$ curl -Ssi http://localhost/

HTTP/1.1 200 OK
Content-Length: 334
Content-Type: text/plain; charset=utf-8

RequestID: 5e6309a2-c9e9-41b9-bcbe-ad90afddf475
Hostname: 3405570c9e33
IP: [172.17.0.2]
Host: localhost
URL: /
Method: GET
Proto: HTTP/1.1
Params: map[]
Headers: map[Accept:[*/*] User-Agent:[curl/8.4.0] X-Request-Id:[5e6309a2-c9e9-41b9-bcbe-ad90afddf475]]
UserAgent: curl/8.4.0
RemoteAddr: 10.10.65.1:61337
Environment: map[]

Helm

Under development.

Configuration

NOTE: Flags take precedence over environment variables.

Flag	Environment variable	Default value	Description
host	WHOAMI_HOST	0.0.0.0	Web server listen address
port	WHOAMI_PORT	8080	Web server listen port
log-formatter	WHOAMI_LOG_FORMATTER	json	Output log formatter: fmt or json
log-level	WHOAMI_LOG_LEVEL	info	Output log level: debug, info, warn, error
access-log	WHOAMI_ACCESS_LOG	false	Enable web server access log
access-log-skip-paths	WHOAMI_ACCESS_LOG_SKIP_PATHS	""	Comma-separated list of url paths to exclude from access log
read-timeout	WHOAMI_READ_TIMEOUT	"0s"	Web server read timeout
read-header-timeout	WHOAMI_READ_HEADER_TIMEOUT	"0s"	Web server read header timeout
write-timeout	WHOAMI_WRITE_TIMEOUT	"0s"	Web server write timeout
tls-cert	WHOAMI_TLS_CERT_FILE	""	TLS certificate file
tls-key	WHOAMI_TLS_KEY_FILE	""	TLS private key file
tls-ca	WHOAMI_TLS_CA_FILE	""	TLS CA certificate file for mTLS authentication

Usage

HTTP Routes

• Method	Path	Params	Description
  ANY	/	?[delay=<duration>]	Returns web server info in plain text format

  Parameters:

  • delay (Optional): Request delay duration in Go-duration format (ex. 5s, 1m, etc).

  Request:

  curl -Ss http://localhost/

  Response:

   RequestID: 29a11732-d622-4c02-8366-4d834954c5aa
   Hostname: my.local
   IP: 192.168.1.1
   Host: localhost
   URL: /
   Method: GET
   Proto: HTTP/1.1
   UserAgent: PostmanRuntime/7.29.2
   RemoteAddr: [::1]:49995

  ---

• Method	Path	Params	Description
  ANY	/api/*	?[delay=<duration>]	Returns web server info in JSON format

  Parameters:

  • delay (Optional): Request delay duration in Go-duration format (ex. 5s, 1m, etc).

  Request:

  curl -Ss http://localhost/api

  Response:

  {
   "request_id": "0d5ab77f-c47c-46f3-88b4-fbd56d854007",
   "hostname": "my.local",
   "host": "localhost",
   "url": "/api",
   "method": "GET",
   "user_agent": "curl/7.79.1",
   "remote_addr": "127.0.0.1:50061",
  }

  ---

• Method	Path	Params	Description
  ANY	/data	?[size=<size>]&[unit=<unit>]	Simulates web server data responce with requested size and unit

  Parameters:

  • size (Optional, default: 1): Response data size.
  • unit (Optional, default: B): Response data unit. Possible values: B, KB, MB, GB, TB.

  Request:

  curl -Ss http://localhost/data?size=1&unit=KB

  ---

• Method	Path	Params	Description
  POST	/upload	-	Simulates web server data upload

  Request:

  curl -Ss -X POST http://localhost/upload -F file=@file.txt

  ---

• Method	Path	Params	Description
  GET	/health	-	Returns web server healthcheck status

  Request:

  curl -Ss http://localhost/health

  Response:

  {"status": 200}

  ---

• Method	Path	Params	Description
  POST	/health	-	Set web server healthcheck status

  Payload: Valid HTTP status code in range 100..599.

  Request:

  curl -Ss -X POST -d '418' http://localhost/health

  Response: Accepted with status 202 on success.

  ---

• Method	Path	Params	Description
  GET	/metrics	-	Returns web server metrics in Prometheus format

  Request:

  curl -Ss http://localhost/metrics

  Response:

  ...
  http_request_duration_seconds_sum{code="200",method="GET",path="/metrics",service=""} 0.018380583
  http_request_duration_seconds_count{code="200",method="GET",path="/metrics",service=""} 2
  whoami_build_info{version="0.0.1"} 1
  whoami_runtime_info{arch="arm64",go_version="go1.21",os="darwin"} 1
  ...