>>>
POST / HTTP/1.0
Host: www.example.com
Content-Length: ABC
Content-Type: application/x-www-form-urlencoded
User-Agent: Mozilla

p=0123456789
<<<
HTTP/1.0 200 OK
Date: Mon, 31 Aug 2009 20:25:50 GMT
Server: Apache
Connection: close
Content-Type: text/html
Content-Length: 12

Hello World!