XHR Related Controls

Is there anyway we can do setHeader or setCookie override on XHR requests. Right now in a script the profile we set in setHeader/addHeader does not crry over which is true of browser behavior but can I do a exec which shall add headers to the xhr requests?

Which browser and are the requests http ot https? http requests shouldn’t care if it is XHR or otherwise and should modify the requests on the wire.

Actually its weird that only one request does not abide

Check this waterfall for request #49 and you can see that the cookie is absent
http://www.webpagetest.org/result/140928_XT_8dc32a229f54db2bd876191f0a39e146/1/details/