gistfile1.txt

// VECCHIO
.pipe(
  tap((event: HttpEvent<any>) => {
    if (event instanceof HttpResponse) {

    }
  }, (err: any) => {
  if (err instanceof HttpErrorResponse) {
    // do something
  }
}));
}

//NUOVO 
.pipe(
  catchError((event: HttpEvent<any>) => {
    if (event instanceof HttpErrorResponse) {
      console.log('do something');
    }
    return throwError(event)
  })
);