!!! Overview[1]
[{$pagename}] is a [HTTP Method] which echoes the received request so that a client can see what (if any) changes or additions have been made by intermediate servers.

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]
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* [#1] - [Request methods|Wikipedia:Hypertext_Transfer_Protocol#Request_methods|target='_blank'] - based on information obtained 2016-05-21-