Using a proxy

Today, I was using a proxy to visit a website, the website listed the proxy IP and my real IP correctly, how is it possible? Any ideas how they did that?
 
I don't think you can reproduce it since my real IP was blocked by this website, giving the details doesn't seem to help.

Let me ask in another way:

Assume you manage a website, how can you find out a visitor's real IP if he's behind a proxy visiting your site? I just don't think it's technically possible.
 
JavaScript can also be used to detect your real IP#.

The page linked to by leebrown66 was broken until I enabled scripting for it. Just as it should be IMO.


Boy, I sure do miss Multiproxy... :)
 
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