Angular httpClient interceptor error handling

Question

after reading the documentation on angular about http client error handling, I still don\'t understand why I don\'t catch a 401 error from the server with the code below:

<

Answer 1

You must pass the argument value to the do function of the stream, not create a new function inside it:

return next.handle(request)
    .do((err: any) => {
        console.log('this log isn't');
        if (err instanceof HttpErrorResponse) {
            if (err.status === 401) {
                console.log('nor this one!');
            }
        }
    });