Fiddler: a debugging proxy from Microsoft

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

I've just found two articles at MSDN on Fiddler:
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. Smile

Fiddler rulez

After taking a look on various debugging proxies written in Java, I must admit that Fiddler beats them all. I'm not sure why, but both Paros and WebScarab were awfully slow for me. They might be usable for inspecting basic web browsing sessions, but they failed to record a video stream coming from Move Networks. Only a fraction of the HTTP requests were displayed with both Java proxies. However using Fiddler in a virtual machine (Windows XP) in VMware Fusion showed all HTTP requests made by the Move Networks video player plugin.