http-error.interceptor.ts

export class HttpErrorInterceptor implements HttpInterceptor {
  intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    return next.handle(request).pipe(
      tap(
        () => {},
        error => {
          // There may be other events besides the response error.
          if (
            error instanceof HttpErrorResponse
          ) {
              // do stuff
          }
        }
      )
    );
  }