我对SpringWebFlux中的webclient有问题（webclient对象是用webclient.builder（）创建的）

WebClient.RequestHeadersUriSpec uriSpec = webClient.get();
        WebClient.RequestHeadersSpec<?> bodySpec = uriSpec.uri(route.getUrl());
        System.out.println(route.getUrl());

        return bodySpec.exchangeToMono(response -> {
                System.out.println("Code : " + response.statusCode());
                if (response.statusCode()
                        .equals(HttpStatus.OK)) {
                    return response.bodyToMono(classResult);
                } else if (response.statusCode()
                        .is4xxClientError()) {
                    return response.bodyToMono(classResult);
                } else {
                    return response.createException()
                            .flatMap(Mono::error);
                }
            }).doOnError(signal -> System.out.println("Erreur : " + ((WebClientRequestException) 
             signal).getMessage()));

我只能用doonerror方法打印错误。例如，当我有一个“webclientrequestexception:connection timed out”时，有没有方法返回一个异常或包含错误消息的特定对象？
谢谢