AngularJS HTTP Interceptor for Bearer Token Auth Requests

bearerHttpInterceptor

app.factory('BearerAuthInterceptor', function ($window, $q) {
    return {
        request: function(config) {
            config.headers = config.headers || {};
            if ($window.localStorage.getItem('token')) {
              // may also use sessionStorage
                config.headers.Authorization = 'Bearer ' + $window.localStorage.getItem('token');
            }
            return config || $q.when(config);
        },
        response: function(response) {
            if (response.status === 401) {
                //  Redirect user to login page / signup Page.
            }
            return response || $q.when(response);
        }
    };
});

// Register the previously created AuthInterceptor.
app.config(function ($httpProvider) {
    $httpProvider.interceptors.push('BearerAuthInterceptor');
});

response.status === 401 this code should come under responseError