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")
  -port int
        Port to listen on (default 8080)
  -https-cert-file string
         HTTPS certificate file
  -https-key-file string
         HTTPS 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)

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

  # Run https server

  # Generate .crt and .key files
  $ 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 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"
    "testing"
    "time"

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

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

    client := http.Client{
        Timeout: time.Duration(1 * time.Second),
    }
    _, err := client.Get(srv.URL + "/delay/10")
    if err == nil {
        t.Fatal("expected timeout error")
    }
}

Installation

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

# local development
make
make test
make testcover
make run

# building & pushing docker images
make image
make imagepush