Capture HTTP 401 with Angular.js interceptor

Question

I\'d like to implement authentication on a single page web app with Angular.js. The official Angular documentation recommends the using of interceptors:

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Answer 1

I don't know why, but response with 401 error goes into success function.

'responseError': function(rejection)
                {
                    // do something on error

                    if (rejection.status == 401)
                    {
                        $rootScope.signOut();
                    }

                    return $q.reject(rejection);
                },
                'response': function (response) {
                    // do something on error
                    if (response.status == 401) {
                        $rootScope.signOut();
                    };
                    return response || $q.when(response);
                }