restTemplate 401 Unauthorized: [no body]

@Bean
    public RestTemplate registerTemplate() {
        RestTemplate restTemplate = new RestTemplate(getFactory());
        //这个地方需要配置消息转换器，不然收到消息后转换会出现异常
        restTemplate.setMessageConverters(getConverts());
        return restTemplate;
    }

    private SimpleClientHttpRequestFactory getFactory() {
        SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory();
        factory.setConnectTimeout(connectionTimeout);
        factory.setReadTimeout(readTimeout);
        return factory;
    }

    private List<HttpMessageConverter<?>> getConverts() {
        List<HttpMessageConverter<?>> messageConverters = new ArrayList<>();
        // String转换器
        StringHttpMessageConverter stringConvert = new StringHttpMessageConverter();
        List<MediaType> stringMediaTypes = new ArrayList<MediaType>() {{
            //添加响应数据格式，不匹配会报401
            add(MediaType.TEXT_PLAIN);
            add(MediaType.TEXT_HTML);
            add(MediaType.APPLICATION_JSON);
        }};
        stringConvert.setSupportedMediaTypes(stringMediaTypes);
        messageConverters.add(stringConvert);
        return messageConverters;
    }