We can add headers to an http request as in the below format.( This is an example only and not directly related syntax of AddRequestHeaders() API.

( "Content-Type"), _T("application/x-www-form-urlencoded")
I would like to know what exactly it means. By this , is the client requesting the response of the request in a particular format?

I have also come across code with request headers in the below format Here is the client requesting data in json format?

Thanks in advance..