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Why is it so that when I set a HTTP proxy in the system preferences app, but some "my ip" sites still show my ip like in comma separated list in the first place? For example this one: I dont remember having such issues on my Windows machine. What should I do to hide my ip totally and use only the proxy?

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up vote 5 down vote accepted

Proxies usually add an X-Forwarded-For HTTP header that informs the target web-server of the true origin of the request.

There are anonymising proxies available which do not do this - a quick Google search will find them.

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The WWW site hyperlinked-to in the question is using that very header. – JdeBP Dec 8 '11 at 0:25

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