AngularJS Promises Use

AngularJSPromises.js

//controller
angular.module('app.controllers')
    .controller('GitCtrl', function(GitApi) {
        GitApi.fetchUser('codiodes')
            .then(function(user) {
                console.log(user);
            }, function(error) {
                console.log(error);
            })
    })

//factory
angular.module('app.factories')
.factory('GitApi', function($http, $q) {
  return {
    fetchUser: function(username) {
      var url = 'https://api.github.com/users/' + username;
      var promise = $q.defer();
      $http.get(url)
      .success(function (data, status, headers, config) {
        defer.resolve(data);
      })
      .error(function (data, status, headers, config) {
        defer.reject(data);
      })
      return promise;
    }
  }
})