VerifyCache in angularjs

I have a certain angularjs service below..

angular.service('SubmitPayment', function($resource){
  return $resource('api/SubmitPayment', {}, {
    query: {method:'GET', params:{}, isArray:false, verifyCache: false}
  });
});

anyone knows what does verifyCache do?

Thank you

Older versions of AngularJS had this option:

verifyCache – {boolean=} – If true then whenever cache hit occurs, the object is returned and an async request will be made to the server and the resources as well as the cache will be updated when the response is received.

See line 7360, http://code.google.com/p/freality/source/browse/trunk/space/war/angular.js?r=105

Quote from Vojta: "We got rid off whole $resource caching." -- https://groups.google.com/d/msg/angular/qWQyiXNNjqs/OMquMSVIF58J

The current code for the $resource service doesn't have this option: https://github.com/angular/angular.js/blob/master/src/ngResource/resource.js#L43

I think you can now manipulate the headers that are sent instead.