Fiddler

de John Stubbings 01/31/2008 11:45

http://www.fiddlertool.com/Fiddler2/version.asp

Fiddler is an HTTP debugging proxy that logs all HTTP traffic between
your computer and the Internet. Fiddler enables you to inspect all HTTP
traffic, set breakpoints, and "fiddle" with incoming or outgoing data.
Fiddler is much simpler to use than NetMon or other network debuggers
because it exposes only HTTP traffic and does so in a user-friendly
format.

Fiddler includes a simple but powerful Microsoft JScript .NET
event-based scripting subsystem flexible enough to support a broad array
of HTTP debugging tasks. Written in C# on the Microsoft .NET Framework,
Fiddler is available as an unsupported PowerToy for Internet Explorer.

http://msdn2.microsoft.com/en-us/library/bb250446.aspx