Is it necessary to unsubscribe from observables created by Http methods?

Question

Do you need to unsubscribe from Angular 2 http calls to prevent memory leak?

 fetchFilm(index) {
        var sub = this._http.get(`http://example.com`)
              


        

Answer 1

You should definitely read this article. It shows you why you should always unsubscribe even from http.

If after creating the request but before receiving an answer from the back-end you deem the component unnecessary and destroy it, your subscription will maintain the reference to the component thus creating a chance for causing memory leaks.

Update

The above affirmation seems to be true, but anyway, when the answer comes back the http subscription is destroyed anyway