Use pipe(take(1)) or pipe(first()) for all methods since http will never give a second result

[gideruette]

I suggest that we can add a take(1) or the operator first() to methods pipes so that we don't need to unsubscribe observable. Http won't give us a second value after return

[andresbm05]

That is not needed. Http request Observables returned by HttpClient are self-completed after emitting the response, so you dont need to unsubscribe and it will not cause memory leaks.