How to capture intercepted information when there is no Token?

// Use subscription Error
this.http.get('/user').subscribe(
  res => console.log('success', res),
  err => console.error('error', err)
);
// Or use catchError
this.http.get('/user').pipe(
  catchError(err => {
    console.error('error', err);
    return of({});
  })
).subscribe();