Fiddler

Fiddler 4.6

Free
Fiddler is a web debugging proxy that displays Internet traffic from your PC
4.2  (125 votes)
5.2
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Fiddler is a web debugging proxy that displays all Internet traffic from your PC. It lets you see the “total page weight,” HTTP caching and compression at a glance. Isolate performance bottlenecks with rules like “Flag any uncompressed responses larger than 25kb.”

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