I\'m using angular 1.1.5 and I\'m using a $resource to make a XHR to a REST service but it seems like the the $resource isn\'t appending the header as X-Requested-With as XM
It used to but was changed. (see here)
"X-Requested-With header is rarely used in practice and by using it all the time we are triggering preflight checks for crossdomain requests."
From Thomas Pons' answer here.