Fiddler

Fiddler: A useful HTTP Debugging Proxy

Fiddler is an HTTP Debugging Proxy that logs all HTTP traffic between your computer and the Internet. This application is very useful for various purposes, such as tracking down performance bottlenecks, seeing which cookies are being sent or which downloaded content is made cacheable and others.

This free application allows you to inspect all HTTP traffic, set breakpoints and perform various settings for incoming and outgoing data. Fiddler has been designed to be easier to use than the other network debuggers and as a result it only exposes HTTP traffic in a friendly format.
Requirements:

- 800 MHz CPU or higher.
- 10 MB free disk space.
- 128 MB of RAM or more.
- Microsoft .NET Framework 2.0 or higher.