How to prevent angular.js $http object from sending X-Requested-With header?

Angular.js, when accessing a web service using the $http object, automatically adds a X-Requested-With:XMLHttpRequest header to the request.

The web service I am accessing using CORS doesn't support X-Requested-With header, so I tried to eliminate it but I can't acess the $httpProvider object. I get an undefined object error, and if I reference it in the controllers parameters, so that angular injects it I get a "Error: Unknown provider: $httpProviderProvider <- $httpProvider"

So I wonder how can I access the $httpProvider, like it says in the docs (http://docs.angularjs.org/api/ng.$http) to tell angular.js not to send that header...

angular.module('myModule', [])
    .config(['$httpProvider', function($httpProvider) {
        delete $httpProvider.defaults.headers.common["X-Requested-With"]
    }])

I found that, besides Justen answer, I can also do it on a per request basis like this:

delete $http.defaults.headers.common['X-Requested-With']

Since Angular JS version 1.1.1 removing the header is no longer necessary.

See the change log:
https://github.com/angular/angular.js/blob/master/CHANGELOG.md#111-pathological-kerning-2012-11-26

For people like me who were using the header to identify ajax requests and respond to them differently.

e.g. making a request after the session expires.

You can re-enable the header like so:

angular.module('yourModule', [])
.config(['$httpProvider', function($httpProvider) {
    $httpProvider.defaults.headers.common["X-Requested-With"] = 'XMLHttpRequest';
}]);