Angular 4.3 HttpClient : Intercept response

Question

In the documentation about the new HttpClientModule included in the new version of Angular 4.3, the mechanism to intercept requests is explained very well. Ther

Answer 1

From what i can understand (I've only done the intercept for request and inject auth token) .. you can attach a .do() and test if is a reponse .. like (as doc says):

import 'rxjs/add/operator/do';

export class TimingInterceptor implements HttpInterceptor {
  constructor(private auth: AuthService) {}

  intercept(req: HttpRequest, next: HttpHandler): Observable> {
    const started = Date.now();
    return next
      .handle(req)
      .do(event => {
        if (event instanceof HttpResponse) { //<-- HERE
          const elapsed = Date.now() - started;
          console.log(event} ms.`);
        }
      });
  }

}