http://httpbin.org

Sometimes you need to write an HTTP server to debug the client you are writing.

One quick way to avoid this is to use http://httpbin.org/. It supports most of the common HTTP verbs and mostly return the variables you send in.

For example (note the args field in the reply):

$ curl -i 'http://httpbin.org/get?x=1&y=2'
HTTP/1.1 200 OK
Content-Type: application/json
Date: Mon, 15 Oct 2012 21:50:27 GMT
Server: gunicorn/0.13.4
Content-Length: 386
Connection: keep-alive

{
  "url": "http://httpbin.org/get?x=1&y=2",
  "headers": {
    "Content-Length": "",
    "Connection": "keep-alive",
    "Accept": "*/*",
    "User-Agent": "curl/7.22.0 (x86_64-pc-linux-gnu) libcurl/7.22.0 OpenSSL/1.0.1 zlib/1.2.3.4 libidn/1.23 librtmp/2.3",
    "Host": "httpbin.org",
    "Content-Type": ""
  },
  "args": {
    "y": "2",
    "x": "1"
  },
  "origin": "75.82.8.111"
}