我在用java调用云开发HTTPAPI上传文件时，总返回400错误，麻烦大神帮忙看下问题出在哪？ import cn.hutool.json.JSONObject; import com.dimon.cloud.commons.rest.ApiResponse; import com.dimon.cloud.customize.feign.WechatApi; import org.apache.http.client.HttpClient; import org.apache.http.client.methods.HttpPost; import org.apache.http.entity.mime.MultipartEntityBuilder; import org.apache.http.impl.client.HttpClientBuilder; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.RestController; import org.springframework.web.multipart.MultipartFile;   import javax.validation.constraints.NotNull; import java.io.IOException;   /**  * @Author: He Zhigang  * @Date: 2019/10/12 18:00  * @Description:  */ @RestController public class BackendController {       @Autowired     String accessToken;       @Autowired     WechatApi wechatApi;       @PostMapping("/upload/prod/img")     public ApiResponse uploadFile(@NotNull MultipartFile file) throws IOException {         String dir = "p_cust/prod/img/";         String path = dir + file.getOriginalFilename();         JSONObject reqBody = new JSONObject();         reqBody.put("env", "dev-4cs4fs");         reqBody.put("path", path);         JSONObject respJson = wechatApi.uploadFile(accessToken, reqBody);         String url = respJson.getStr("url");   //        HttpResponse httpResponse = HttpRequest.post(url) //                .contentType("multipart/form-data") //                .header("Content-Type", "multipart/form-data") //                .form("key", path) //                .form("Signature", respJson.getStr("authorization")) //                .form("x-cos-security-token", respJson.getStr("token")) //                .form("x-cos-meta-fileid", respJson.getStr("cos_file_id")) //                .form("file", file) //                .execute();         HttpClient httpClient = HttpClientBuilder.create().build();         HttpPost httpPost = new HttpPost(url);         httpPost.setHeader("Content-Type", "multipart/form-data");           MultipartEntityBuilder builder = MultipartEntityBuilder.create();         builder.addBinaryBody("file", file.getBytes())                 .addTextBody("key", path)                 .addTextBody("Signature", respJson.getStr("authorization"))                 .addTextBody("x-cos-security-token", respJson.getStr("token"))                 .addTextBody("x-cos-meta-fileid", respJson.getStr("cos_file_id"));         httpPost.setEntity(builder.build());         org.apache.http.HttpResponse res = httpClient.execute(httpPost);         return ApiResponse.ok().setBody(res);     }       } 上面我用了两种不同的HTTP client 都是返回同样的错误。[图片]

小程序客服聊天记录保存多久? 好像找不到以前的聊天记录了