hello people
I have a question here. As we all know that a proxy service is used to proxify the request originated from the end station or to conceal its ip address. IMHO, I think, that the ip address of the end station(from where the request is originated, passing through a proxy service) can be still known, if you strip off the proxy header (the header given to the packet by proxy service ). There is a field in the http header about X_Forwarded_For which gives you the ip address of end station, even after passing through a proxy service. Please ******** me on this.I may be wrong. I am posting a URL here which gives you all information of your http header, and it gives you the ip of any intermediate server(if you are going through a proxy server), as well as the ip of end station.
http://inet-police.com/cgi-bin/env.cgi

Lately, there had been a thread , which have information about an application that spoofes the http header information. I could'nt find that thread again in any forum. Please anyone refer to the thread.