Fiddler2 - New Version of Fiddler Debugging Proxy
by David Hayden ( Microsoft MVP C# ), Filed: .NET Developer Tools
This is more-or-less a bookmark for myself, because I always forget about Fiddler2, which is developed separately from Fiddler and located at a different URL.
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 includes a powerful event-based scripting subsystem, and can be extended using any .NET language. Fiddler is freeware and can debug traffic from virtually any application, including Internet Explorer, Mozilla Firefox, Opera, and thousands more.
Fiddler, Fiddler2