How to set X-Requested-With header in AngularJS ngDialog plugin

Question

I was able to figure out how to get the $http object to send X-Requested-With header but I now need to do the same for AngularJS's ngDialog plugin. (or would prefer to)

I'm trying to use the Zend Framework 2 getRequest()->isXmlHttpRequest() to detect ajax calls in a controller, but that means I need to be able to set the X-Requested-With header to XMLHttpRequest

SW