go-httpbin

A reasonably complete and well-tested golang port of Kenneth Reitz's httpbin service, with zero dependencies outside the go stdlib.

Usage

Run as a standalone binary, configured by command line flags or environment variables:

$ go-httpbin --help
Usage of go-httpbin:
  -host string
      Host to listen on (default "0.0.0.0")
  -https-cert-file string
      HTTPS Server certificate file
  -https-key-file string
      HTTPS Server private key file
  -max-body-size int
      Maximum size of request or response, in bytes (default 1048576)
  -max-duration duration
      Maximum duration a response may take (default 10s)
  -port int
      Port to listen on (default 8080)

Examples:

# Run http server
$ go-httpbin -host 127.0.0.1 -port 8081

# Run https server
$ openssl genrsa -out server.key 2048
$ openssl ecparam -genkey -name secp384r1 -out server.key
$ openssl req -new -x509 -sha256 -key server.key -out server.crt -days 3650
$ go-httpbin -host 127.0.0.1 -port 8081 -https-cert-file ./server.crt -https-key-file ./server.key

Docker images are published to Docker Hub:

# Run http server
$ docker run -P mccutchen/go-httpbin

# Run https server
$ docker run -e HTTPS_CERT_FILE='/tmp/server.crt' -e HTTPS_KEY_FILE='/tmp/server.key' -p 8080:8080 -v /tmp:/tmp mccutchen/go-httpbin

The github.com/mccutchen/go-httpbin/httpbin/v2 package can also be used as a library for testing an applications interactions with an upstream HTTP service, like so:

package httpbin_test

import (
	"net/http"
	"net/http/httptest"
	"os"
	"testing"
	"time"

	"github.com/mccutchen/go-httpbin/v2/httpbin"
)

func TestSlowResponse(t *testing.T) {
	app := httpbin.New()
	testServer := httptest.NewServer(app.Handler())
	defer testServer.Close()

	client := http.Client{
		Timeout: time.Duration(1 * time.Second),
	}

	_, err := client.Get(testServer.URL + "/delay/10")
	if !os.IsTimeout(err) {
		t.Fatalf("expected timeout error, got %s", err)
	}
}

Installation

To add go-httpbin to an existing golang project:

go get -u github.com/mccutchen/go-httpbin/v2

To install the go-httpbin binary:

go install github.com/mccutchen/go-httpbin/v2/cmd/go-httpbin

Motivation & prior art

I've been a longtime user of Kenneith Reitz's original httpbin.org, and wanted to write a golang port for fun and to see how far I could get using only the stdlib.

When I started this project, there were a handful of existing and incomplete golang ports, with the most promising being ahmetb/go-httpbin. This project showed me how useful it might be to have an httpbin library available for testing golang applications.

Known differences from other httpbin versions

Compared to the original:

No /brotli endpoint (due to lack of support in Go's stdlib)
The ?show_env=1 query param is ignored (i.e. no special handling of runtime environment headers)
Response values which may be encoded as either a string or a list of strings will always be encoded as a list of strings (e.g. request headers, query params, form values)

Compared to ahmetb/go-httpbin:

No dependencies on 3rd party packages
More complete implementation of endpoints

Development