!!! Overview
[{$pagename}] is using the application/x-www-form-urlencoded format as defined by [W3C.REC‑html401‑19991224]. 

[{$pagename}] is typically used in [HTTP GET] requests. The same [{$pagename}] method is also used when adding parameters to the fragment component of a [URL].
!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]