gistfile1.js

angular.module('magnet.services', []).
  config(['$httpProvider', function($httpProvider) {
    var interceptor = ['$q', '$rootScope', function($q, $rootScope) {
      //handle notifications at root
      if (!$rootScope.notifications) {
        $rootScope.notifications = [];
        $rootScope.removeNotification = function(n) {
          $rootScope.notifications = $rootScope.notifications.filter(function(notification) {
            return notification != n;
          });
        };
      }

      $rootScope.loading = true;

      function success(response) {
        return response;
      }

      function error(response) {
        switch (response.status) {
          case 401:
            window.location = '/signin';
            break;

          default:
            //handle error notifications
            if (response.data && response.data.error) {
              response.data.ts = new Date().getTime();
              $rootScope.notifications.push(response.data);
            }

            return $q.reject(response);
        }
      }

      return function(promise) {
        $rootScope.loading = true;

        return promise.then(success, error).then(function(r){ $rootScope.loading = false; return r; });
      }
    }];

    $httpProvider.responseInterceptors.push(interceptor);
  }]);