How to Intercept HTTP requests from angular to include an authorization token

angularAuth.js

app.factory('TokenInterceptor', function($q, $cookies, $location, $rootScope, $injector) {
  return {
    request: function(config) {
      config.headers = config.headers || {};
      if($cookies.get('token')) {
        config.headers.authorization = $cookies.get('token');
      }
      return config;
    }
  }
});

app.config(function($httpProvider) {
  $httpProvider.interceptors.push('TokenInterceptor');
});