Fiddler

Fiddler 4.4 beta

Free
Fiddler enables you to inspect all HTTP traffic and "fiddle" with any data
4.2  (125 votes)
4.6
4.6.2.3 (See all)

Fiddler can help you answer these questions, and many more. 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.

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