Jquery, No X-Requested-With=XMLHttpRequest in ajax request header?

Question

SOME TIMES there is no X-Requested-With header, sometimes there is.

I checked in firebug and found that, don\'t know why.

So when I use requ

Answer 1

I was facing this issue as well with version 1.6.2, especially when the page has been setting idle for a while. Expanding on jitter's answer, this is adding the X-Requested-With redundantly for every request in one place. I put this in my Master page. Hope this works out.

$(document).ajaxSend(function (event, request, settings) {
    request.setRequestHeader("X-Requested-With", "XMLHttpRequest");
});