!!! Overview
[{$pagename}] is an [HTTP Header Field] used by [HTTP] clients to tell the server what [Content-Types] they can accept. The server will then send back a response, which will include a [Content-Type] header telling the client what the content type of the returned content actually is.

However, as you may have noticed, [HTTP] requests can also contain [Content-Type] headers. In a [HTTP POST] or [HTTP PUT] requests. With those request types, the client is actually sending a bunch of data to the server as part of the request, and the [Content-Type] header tells the server what the data actually is (and thus determines how the server will parse it).

In particular, for a [HTTP POST] request resulting from an [HTML] form submission, the [Content-Type] of the request will (normally) be one of the standard form content types below, as specified by the enctype attribute on the <form> tag:

* application/x-www-form-urlencoded (default, older, simpler, slightly less overhead for small amounts of simple ASCII text, no file upload support)
* multipart/form-data (newer, adds support for file uploads, more efficient for large amounts of binary data or non-ASCII text)

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