my output

curl -v -X POST -d "key=val" http://127.0.0.1:4567/postman/123456
* About to connect() to 127.0.0.1 port 4567 (#0)
*   Trying 127.0.0.1... connected
* Connected to 127.0.0.1 (127.0.0.1) port 4567 (#0)
> POST /postman/123456 HTTP/1.1
> User-Agent: curl/7.21.6 (x86_64-pc-linux-gnu) libcurl/7.21.6 OpenSSL/1.0.0e zlib/1.2.3.4 libidn/1.22 librtmp/2.3
> Host: 127.0.0.1:4567
> Accept: */*
> Content-Length: 7
> Content-Type: application/x-www-form-urlencoded
>
< HTTP/1.1 404 Not Found
< X-Frame-Options: sameorigin
< X-Xss-Protection: 1; mode=block
< Content-Type: text/html;charset=utf-8
< X-Cascade: pass
< Content-Length: 451
< Server: WEBrick/1.3.1 (Ruby/1.9.2/2011-07-09)
< Date: Fri, 02 Mar 2012 23:11:57 GMT
< Connection: Keep-Alive
<
<!DOCTYPE html>
<html>
<head>
  <style type="text/css">
  body { text-align:center;font-family:helvetica,arial;font-size:22px;
    color:#888;margin:20px}
  #c {margin:0 auto;width:500px;text-align:left}
  </style>
</head>
<body>
  <h2>Sinatra doesn&rsquo;t know this ditty.</h2>
  <img src='http://127.0.0.1:4567/__sinatra__/404.png'>
  <div id="c">
    Try this:
    <pre>post '/postman/123456' do
  "Hello World"
end</pre>
  </div>
</body>
</html>
* Connection #0 to host 127.0.0.1 left intact
* Closing connection #0