gistfile1.js

angular
  .module('api', ['$http'])
  .constant('API_URL', '/api/')
  .factory('getInitializationData', function () {
      //since $http.get returns a promise,
      //and promise.then() also returns a promise
      //that resolves to whatever value is returned in it's
      //callback argument, we can return that.
      return $http
                  .get(API_URL + 'action/initalize')
                  .then(function (result) {
                     return result.data;
                  });
  });