!!! Overview
[{$pagename}] is a [HTTP Response Header] defines the [Authentication Method] that should be used to gain access to a [resource] behind a [Proxy Server]. 

[{$pagename}] authenticate the request to the proxy server, allowing it to transmit the request further.

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]