Squid is a good general-purpose proxy. On Mac, SquidMan is a nice installer and front-end for Squid.

Charles is a proxy largely intended for use by developers to view and manipulate HTTP traffic. It has some handy features like bandwidth and latency throttling, and a breakpoint feature where you can see the request and potentially alter it before a response is sent.

The best HTTP debugging tool for Windows developers is Fiddler, which can also act as a debug proxy for Mac or Linux clients. Fiddler is a very mature tool at this point, and is pretty transparent for WinInet clients.

HTTP::Proxy is a proxy written in Perl, the advantage being full manipulation of the HTTP stream by a developer. It doesn’t work on Windows for some reason.

And of course many web servers have built-in or add-on proxy support.


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