Set a request header in JavaScript

by

W3C Spec on setrequestheader.

The brief points:

If the request header had
already been set, then the new value
MUST be concatenated to the existing
value using a U+002C COMMA followed by
a U+0020 SPACE for separation.

UAs MAY give the User-Agent header an initial value, but MUST allow authors to append values to it.

However – After searching through the framework XHR in jQuery they don’t allow you to change the User-Agent or Referer headers. The closest thing:

// Set header so the called script knows that it's an XMLHttpRequest
xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest");

I’m leaning towards the opinion that what you want to do is being denied by a security policy in FF – if you want to pass some custom Referer type header you could always do:

xhr.setRequestHeader('X-Alt-Referer', 'http://www.google.com');

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