How do websites get your real IP address when you're proxied? -

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from trusted computer engineer , rapidshare, seems possible real ip address when you're proxied. note define proxied mean using kind of tunneling (vpn, ssh, etc) computer not share ip address. not mean proxy sites, since trivial javascript , server side code can ip address easily.

my question though how? computer engineer mentioned said ask browser directly (presumably js) , cough real ip. mentioned using tracking image, although don't think work since thats requested proxy, not directly.

on http proxies, can use header name x-forwarded-for. format of header looks it:

x-forwarded-for: client1, proxy1, proxy2

this header added http proxy, web applications check it, of course can send fake header. supported major proxy servers squid, ms isa server, cisco cache engine, etc.


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