Interceptor for token based authentication

ngInterceptor.js

app.factory('authInterceptor', ['$q', function ($q) {
        return {
            request: function (config) {
                config.headers = config.headers || {};
                if (config.headers.skipAuthorization === false) {
                    var token = localStorage.getItem('authenticationToken');
                    if (token != null) {
                        config.headers.Authorization = token;
                    }
                }
                return config;
            },
            response: function (response) {
                if (response.headers("Authorization") != undefined || response.headers("Authorization") != '') {
                    localStorage.setItem('authenticationToken', response.headers("Authorization"));
                }
                return response;
            },
            responseError: function (rejection) {
                if (rejection.status === "401") {
                    localStorage.removeItem('authenticationToken');
                }
                return $q.reject(rejection);
            }
        };
    } ]);