Not able to make the ajax request with my header given by ember-simple-auth authorizers

I have developed a template (feedheader.hbs) which I am rendering in my feed template like {{ render 'feedheader' feedheader}}.This feedheader contains the username and profile pic of user.I need to send the the requests to http://ift.tt/1NS6RkP along with my auth header to get the user details.So I made a controller for feedheader and made the ajax requests.I am using ember-simple-auth (fb login ) for authorization.

controller.js

import Ember from 'ember';
import OAuth2Bearer from 'ember-simple-auth/authorizers/oauth2-bearer';

const { service } = Ember.inject;

export default Ember.Controller.extend(OAuth2Bearer,{
      session:service('session'),
      init:function(){
            this.get('session').authorize('authorizer:application', (headerName, headerValue) => {
              const headers = {};
              headers[headerName] = headerValue;
              Ember.$.ajax('http://ift.tt/1NS6RkP', { headers });
});

      }


});

But it throws an error in console

 "Uncaught Error: Assertion Failed: Expected hash or Mixin instance, got [object Function]"

authorizers(application.js)

import OAuth2Bearer from 'ember-simple-auth/authorizers/oauth2-bearer';

export default OAuth2Bearer.extend();

The authorizers is working fine in my adapter.There is some simple thing I am missing and not able to fix this.Please tell how to send the ajax request with my authorizers header.