code: protected Mono<ServerResponse> renderErrorResponse(ServerRequest request) {
  		boolean includeStackTrace = isIncludeStackTrace(request, MediaType.ALL);
  		Map<String, Object> error = getErrorAttributes(request, includeStackTrace);
  		return ServerResponse.status(getHttpStatus(error))
  				.contentType(MediaType.APPLICATION_JSON_UTF8)
  				.body(BodyInserters.fromObject(error));
  	}
docs: Render the error information as a JSON payload.
  @param request the current request
  @return a {@code Publisher} of the HTTP response