What is Proxy?

Proxy is a network computer that can serve as an intermediate for connection with other computers. They are usually used for the following purposes:
As firewall, a proxy protects the local network from outside access.
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      As IP-addresses multiplexer, a proxy allows to connect a number of computers to Internet when having only one IP-address
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      Proxy servers can be used (to some extent) to anonymous web surfing.
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      Specialized proxy servers can filter out unwanted content, such as ads or 'unsuitable' material.
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      Proxy servers can afford some protection against hacking attacks.


      The program Win gate is often used as proxy. Quite a number of such proxies are open to easy access. Anonymous proxies hide the real IP address (and sometimes other information) from websites that the user visits. There are two sorts; ones can be used in the same way as the non-anonymous proxies above, and web-based anonymizers.


      Using a non-anonymous proxy:


      HTTP_X_FORWARDED_FOR = 62.64.175.55, 194.72.9.37. This shows the IP address (first number) and possibly the IP address of the proxy server used (second).


      Using an anonymous proxy:


      HTTP_X_FORWARDED_FOR = 66.51.107.3 This now only shows the IP address of the proxy.

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