RestTemplate报错400 Bad Request的解决方案

    @Autowired
    RestTemplate restTemplate;

    public boolean alarm(String url,String body) {
            if (body == null || url == null) {
                return false;
            }
        try {
            HttpHeaders httpHeaders = new HttpHeaders();
            httpHeaders.add(HttpHeaders.CONTENT_TYPE, ContentType.APPLICATION_JSON.toString());

            HttpEntity<String> entity = new HttpEntity<>(body, httpHeaders);
            FeishuAlarmResp result = restTemplate.postForObject(url, entity, FeishuAlarmResp.class);
            if (result == null || result.getStatusCode() == null || result.getStatusCode() != 0) {
                log.error("http发送失败>>>>>>result={} message={}",JSON.toJSONString(result),body);
                return false;
            }
        } catch (Throwable t) {
            log.error("http发送异常:url:" + url + ",body:" + body, t);
            return false;
        }
        return true;
    }

@Autowired
private RestTemplateBuilder restTemplateBuilder;
@Autowired
private RestTemplate restTemplate;
@Bean
public RestTemplate getRestTemplate() {
    return restTemplateBuilder.build();
}

//调用方式：
String baiduHtml = restTemplate.getForObject("https://www.baidu.com", String.class);
System.out.println(baiduHtml);

@Component
public class RestTemplateConfig {


    /**
     * RestTemplate
     * @return RestTemplate
     */
    @Bean
    public RestTemplate restTemplate() {
        return getRestTemplate();
    }

    /**
     * 获取自定义 RestTemplate
     * @return RestTemplate
     */
    private RestTemplate getRestTemplate() {
        RestTemplate restTemplate = new RestTemplateBuilder()
                .setConnectTimeout(5 * 1000)
                .setReadTimeout(60 * 1000)
                .build();
        // 为避免汉字变成问号，将String转换器编码格式置为 UTF-8
        restTemplate.getMessageConverters().forEach(converter -> {
            if (converter instanceof StringHttpMessageConverter) {
                ((StringHttpMessageConverter) converter).setDefaultCharset(StandardCharsets.UTF_8);
            }
        });
        return restTemplate;
    }
}