!!! Overview
[{$pagename}] is a [HTTP Header Field] used within a [HTTP Response]

Not all [HTTP Header Fields] appearing in a [HTTP Response] are [{$pagename}]. For example, the [Content-Length] [HTTP Header Fields] is an [HTTP Entity Header] referring to the size of the body of the [HTTP Response] [message]. However, these entity Response are usually called [{$pagename}] in such a [context].

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