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Angular 4 RxJS retry failed request

How To handle and retry the failed request due to Poor Network Connection in Angular 4?

In Angular 4, simply retry the request using RxJS operator called .retry (). It is automatically presubscribed to an Observable, thus reissuing the request when an error occurred!

Import RxJS for using retry () method-
import 'rxjs/add/operator/retry';

HTTP Observables for retry the failed request 
  .retry(2) //Retry this request up to 2 times.
  .subscribe(data => {console.log(data);}, //Successful responses call the first callback.
      (err: HttpErrorResponse) => {
        if (err.error instanceof Error) {
           console.log('Error - ', err.error.message);
        }else {
            console.log('Error status - ${err.status}, and Error Detail - ${err.error}');

References -
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