why use http headers??

From: Date: Tue, 10 Aug 2004 08:36:12 +0000
Subject: why use http headers??
Groups: php.general 
Request: Send a blank email to php-general+get-193249@lists.php.net to get a copy of this message
Hey people, i need some help. Im missing some arguments for using http headers, especially "content-length", for speeding up a site or just improving the quality of a site :) any comments appreciated...

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