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Fiddler is a debugging program for websites.
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Beautiful, cross-platform & open-source tools to debug, test & build with HTTP(S). One-click setup for browsers, servers, Android, CLI tools, scripts and more.
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HTTP proxy / HTTP monitor / Reverse Proxy.
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Get started with Google Chrome's built-in web developer tools.
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HttpWatch: The ultimate HTTP Sniffer for Chrome, IE and iOS.
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SplineTech JavaScript Debugger. Debug JavaScript.