PUBLIC MARKS with tags http & freeware

HTTPLook is a http sniffer, which gives a complete picture of any site at work. HTTPLook can restore the data transmitted between the local computer and the server and show the control footing and contents of the captured resources.

Fiddler is a HTTP Debugging Proxy which logs all HTTP traffic between your computer and the Internet. Fiddler allows you to inspect all HTTP Traffic, set breakpoints, and "fiddle" with incoming or outgoing data. Fiddler is designed to be much simpler than using NetMon or Achilles, and includes a simple but powerful JScript.NET event-based scripting subsystem.