!!! Overview[1]
[{$pagename}] is a [HTTP Method] which asks for a response identical to that of a [HTTP GET] request, but without the response body. 

[{$pagename}] is useful for retrieving meta-information written in [HTTP Response] [HTTP Header Fields], without having to transport the entire content.

!! 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-