!!! Overview
[{$pagename}] by adding the parameter names and values to the entity body of the [HTTP Request] using the application/x-www-form-urlencoded format as defined by [W3C.REC‑html401‑19991224]. 

[{$pagename}] is typically used in [HTTP POST] requests.

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