Fiddler is one of the few good software from Microsoft that I know (actually I don't remember whether this was an MS project right from the start or did they just simply buy out the developer company). It works only on Windows and recent versions require .NET, but it's nothing one cannot live with. It is feature rich, supports a lot of views of HTTP sessions, supports various methods for HTTPS traffic capturing, etc. This is one of the best HTTP debugging tools for use on the Windows platform.
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Fiddler howtos
- Fiddler PowerToy - Part 1: HTTP Debugging
- Fiddler PowerToy - Part 2: HTTP Performance
Beware that MSDN pages are ... let's call it "IE-optimized" and in my FF2.x they pretty much broke (only the top of the page was visible without any vertical scrollbar). I assume this is not a coincidence, probably MS willingly designed MSDN so only IE users are capable of reading it. I'm sure they know what they're doing, but this tactic won't win me over to the MS side.Fiddler rulez