今天也遇到了这个问题，折腾半天，终于定位到问题所在。先贴下自己找到的答案： [图片] 大致意思就是新版本的Spring框架不再在请求头里面自动添加"Content-Length"了，缺少这个请求头，就是我们出错的原因。 再说解决方法，提供3种思路供大家参考： 方法1：不用RestTemplate了，换一个客户端，比如hutool里面的HttpRequest; public WechatPhoneResponse getUserPhoneNumber(String code) { WechatAccessTokenResponse accessTokenResponse = this.getAccessToken(); String url = "https://api.weixin.qq.com/wxa/business/getuserphonenumber?access_token=" + accessTokenResponse.getAccessToken(); String body = String.format("{\"code\":\"%s\"}", code); HttpResponse response = HttpRequest.post(url) .body(body) .timeout(30000) .execute(); try { log.info("response body : {}", response.body()); return objectMapper.readValue(response.body(), WechatPhoneResponse.class); } catch (JsonProcessingException e) { throw new RuntimeException(e); } } 方法2：自己手动计算content-length,加到headers里面去 public WechatPhoneResponse getUserPhoneNumber(String code) { WechatAccessTokenResponse accessTokenResponse = this.getAccessToken(); String accessToken = accessTokenResponse.getAccessToken(); if (accessToken == null || accessToken.isEmpty()) { throw new RuntimeException("Failed to obtain access token"); } String url = "https://api.weixin.qq.com/wxa/business/getuserphonenumber?access_token=" + accessToken; Map<String, Object> body = Map.of("code", code); HttpHeaders headers = new HttpHeaders(); headers.setContentType(MediaType.APPLICATION_JSON); // 将请求体转换为字节数组，并计算它的长度 String jsonBody; try { jsonBody = objectMapper.writeValueAsString(body); } catch (JsonProcessingException e) { throw new RuntimeException(e); } byte[] bodyBytes = jsonBody.getBytes(StandardCharsets.UTF_8); int contentLength = bodyBytes.length; headers.setContentLength(contentLength); HttpEntity<Map<String, Object>> requestEntity = new HttpEntity<>(body, headers); log.debug("Request URL: {}", url); log.debug("Request Body: {}", body); log.debug("Request Headers: {}", headers); try { return restTemplate.postForObject(url, requestEntity, WechatPhoneResponse.class); } catch (HttpClientErrorException e) { log.error("HTTP Status Code: {}", e.getStatusCode()); log.error("Response Body: {}", e.getResponseBodyAsString()); throw e; 方法3：向最前面描述的那样，修改RestTemplate的配置，把缓冲加回去； @Bean public RestTemplate restTemplate() { RestTemplate restTemplate = builder .setConnectTimeout(Duration.ofSeconds(15)) .setReadTimeout(Duration.ofSeconds(15)) .build(); configureMessageConverters(restTemplate); return restTemplate; }

今天也遇到了这个问题，折腾半天，终于定位到问题所在。先贴下自己找到的答案： [图片] 大致意思就是新版本的Spring框架不再在请求头里面自动添加"Content-Length"了，缺少这个请求头，就是我们出错的原因。 再说解决方法，提供3种思路供大家参考： 方法1：不用RestTemplate了，换一个客户端，比如hutool里面的HttpRequest; public WechatPhoneResponse getUserPhoneNumber(String code) { WechatAccessTokenResponse accessTokenResponse = this.getAccessToken(); String url = "https://api.weixin.qq.com/wxa/business/getuserphonenumber?access_token=" + accessTokenResponse.getAccessToken(); String body = String.format("{\"code\":\"%s\"}", code); HttpResponse response = HttpRequest.post(url) .body(body) .timeout(30000) .execute(); try { log.info("response body : {}", response.body()); return objectMapper.readValue(response.body(), WechatPhoneResponse.class); } catch (JsonProcessingException e) { throw new RuntimeException(e); } } 方法2：自己手动计算content-length,加到headers里面去 public WechatPhoneResponse getUserPhoneNumber(String code) { WechatAccessTokenResponse accessTokenResponse = this.getAccessToken(); String accessToken = accessTokenResponse.getAccessToken(); if (accessToken == null || accessToken.isEmpty()) { throw new RuntimeException("Failed to obtain access token"); } String url = "https://api.weixin.qq.com/wxa/business/getuserphonenumber?access_token=" + accessToken; Map<String, Object> body = Map.of("code", code); HttpHeaders headers = new HttpHeaders(); headers.setContentType(MediaType.APPLICATION_JSON); // 将请求体转换为字节数组，并计算它的长度 String jsonBody; try { jsonBody = objectMapper.writeValueAsString(body); } catch (JsonProcessingException e) { throw new RuntimeException(e); } byte[] bodyBytes = jsonBody.getBytes(StandardCharsets.UTF_8); int contentLength = bodyBytes.length; headers.setContentLength(contentLength); HttpEntity<Map<String, Object>> requestEntity = new HttpEntity<>(body, headers); log.debug("Request URL: {}", url); log.debug("Request Body: {}", body); log.debug("Request Headers: {}", headers); try { return restTemplate.postForObject(url, requestEntity, WechatPhoneResponse.class); } catch (HttpClientErrorException e) { log.error("HTTP Status Code: {}", e.getStatusCode()); log.error("Response Body: {}", e.getResponseBodyAsString()); throw e; 方法3：向最前面描述的那样，修改RestTemplate的配置，把缓冲加回去； @Bean public RestTemplate restTemplate() { RestTemplate restTemplate = builder .setConnectTimeout(Duration.ofSeconds(15)) .setReadTimeout(Duration.ofSeconds(15)) .build(); configureMessageConverters(restTemplate); return restTemplate; }

今天也遇到了这个问题，折腾半天，终于定位到问题所在。先贴下自己找到的答案： [图片] 大致意思就是新版本的Spring框架不再在请求头里面自动添加"Content-Length"了，缺少这个请求头，就是我们出错的原因。 再说解决方法，提供3种思路供大家参考： 方法1：不用RestTemplate了，换一个客户端，比如hutool里面的HttpRequest; public WechatPhoneResponse getUserPhoneNumber(String code) { WechatAccessTokenResponse accessTokenResponse = this.getAccessToken(); String url = "https://api.weixin.qq.com/wxa/business/getuserphonenumber?access_token=" + accessTokenResponse.getAccessToken(); String body = String.format("{\"code\":\"%s\"}", code); HttpResponse response = HttpRequest.post(url) .body(body) .timeout(30000) .execute(); try { log.info("response body : {}", response.body()); return objectMapper.readValue(response.body(), WechatPhoneResponse.class); } catch (JsonProcessingException e) { throw new RuntimeException(e); } } 方法2：自己手动计算content-length,加到headers里面去 public WechatPhoneResponse getUserPhoneNumber(String code) { WechatAccessTokenResponse accessTokenResponse = this.getAccessToken(); String accessToken = accessTokenResponse.getAccessToken(); if (accessToken == null || accessToken.isEmpty()) { throw new RuntimeException("Failed to obtain access token"); } String url = "https://api.weixin.qq.com/wxa/business/getuserphonenumber?access_token=" + accessToken; Map<String, Object> body = Map.of("code", code); HttpHeaders headers = new HttpHeaders(); headers.setContentType(MediaType.APPLICATION_JSON); // 将请求体转换为字节数组，并计算它的长度 String jsonBody; try { jsonBody = objectMapper.writeValueAsString(body); } catch (JsonProcessingException e) { throw new RuntimeException(e); } byte[] bodyBytes = jsonBody.getBytes(StandardCharsets.UTF_8); int contentLength = bodyBytes.length; headers.setContentLength(contentLength); HttpEntity<Map<String, Object>> requestEntity = new HttpEntity<>(body, headers); log.debug("Request URL: {}", url); log.debug("Request Body: {}", body); log.debug("Request Headers: {}", headers); try { return restTemplate.postForObject(url, requestEntity, WechatPhoneResponse.class); } catch (HttpClientErrorException e) { log.error("HTTP Status Code: {}", e.getStatusCode()); log.error("Response Body: {}", e.getResponseBodyAsString()); throw e; 方法3：向最前面描述的那样，修改RestTemplate的配置，把缓冲加回去； @Bean public RestTemplate restTemplate() { RestTemplate restTemplate = builder .setConnectTimeout(Duration.ofSeconds(15)) .setReadTimeout(Duration.ofSeconds(15)) .build(); configureMessageConverters(restTemplate); return restTemplate; }