Angular Http Interceptor

interceptor.js

var interceptor = angular.module('Interceptor',[]);

interceptor.factory('HttpInterceptor', function ($q, $rootScope, $log) {

    var numLoadings = 0;

    return {
        request: function (config) {

            numLoadings++;
            $rootScope.$broadcast("event:pendingRequests");
            return config || $q.when(config)

        },
        response: function (response) {

            if ((--numLoadings) === 0) {
                $rootScope.$broadcast("event:allRequestsComplete");
            }

            return response || $q.when(response);

        },
        responseError: function (response) {
        	
            if (!(--numLoadings)) {
                $rootScope.$broadcast("event:allRequestsComplete");
            }
            
            var status = response.status;

            if (status === 401) {
            	$rootScope.$broadcast('event:loginRequired');
            	$log.info('broadcasted: event:loginRequired')
            }
            
            if (status === 403) {
            	$rootScope.$broadcast('event:accessDenied');  
            	$log.info('broadcasted: event:accessDenied')
            }
            
            if (status === 500) {
            	$rootScope.$broadcast('event:internalServerError', response);  
            	$log.info('broadcasted: event:internalServerError')
            }
            
            return $q.reject(response);
        }
    };
}).config(function ($httpProvider) {
    $httpProvider.interceptors.push('HttpInterceptor');
});