Where does the HTTP Request Header X-Requested-With come from
http-headers, xmlhttprequest
Solution
References to Prototype supporting `X-Requested-With` can be found in Should there be a standard X-Ajax-Engine request header? (posted on 6/30/2006).
Reference in the jQuery source code repository on Github to the May 16, 2006 version of ajax.js where `X-Requested-With` is originally added.
Dojo didn't see to add this until 02/09/08 and references the other libraries:
jQuery, Prototype, YUI and - as it seems - Mootools send the header "X-Requested-With: XMLHttpRequest" with their XHRs.
By 2008-10-21 v1.4, MochiKit calls this a standard:
MochiKit.Async now sets the "X-Requested-With: XMLHttpRequest" header, a de facto standard (Prototype, jQuery, Mootools).
Problem
As we know we can use the `X-Requested-With` http request header to judge that if a http request comes from Ajax or not. Many javascript framework will auto add `X-Requested-With` header in their ajax request，such as jQuery Ajax，Prototype Ajax.And as the wiki of List of HTTP header fields says the `X-Requested-With` is a non-standard request header. After google many times , I haven't found who first come up with the `X-Requested-With` request header. So I want to know if anybody else know where the `X-Requested-With` comes from ? Thanks...