Lesson 08 · 12 min
HttpClient in a service
The component doesn't know the URL. The service returns an Observable; the template draws it via the async pipe.
this.http.get<User[]>("/api/users") returns an Observable: the request goes out when you subscribe. In the template | async subscribes and unsubscribes by itself. In the class, subscribe without unsubscribing on destroy is a leak. Catch errors with catchError in the service or show a branch in the template.
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