How can I achieve a user's real IP when he visit my homepage using http proxy server?

From: Date: Sat, 08 May 2004 10:10:22 +0000
Subject: How can I achieve a user's real IP when he visit my homepage using http proxy server?
Groups: php.pear.general 
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The value of the environment variable "REMOTE_ADDR" is not his real ip but that of the http proxy server. How can I achieve a user's real IP when he visit my homepage using http proxy server?

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