HarmonyOS 鸿蒙Next文件上传接口数据返回信息

可以尝试订阅服务端请求信息，获取的headers中包含有header和body，参考文档：

https://developer.huawei.com/consumer/cn/doc/harmonyos-references-V5/js-apis-request-V5#onheaderreceive7

demo如下：

import { BusinessError, request } from '[@kit](/user/kit).BasicServicesKit';
[@Entry](/user/Entry)
[@Component](/user/Component)
struct UploadFile {
  [@State](/user/State) message: string = 'Hello World';
  upload() {
    let uploadConfig: request.UploadConfig = {
      url: 'http://www.example.com', // 需要手动将 url 替换为真实服务器的 HTTP 协议地址
      header: { 'Accept': '/' },
      method: "POST",
      files: [{
        filename: "test",
        name: "test",
        uri: "internal://cache/test.jpg",
        type: "jpg"
      }],
      data: [{ name: "name123", value: "123" }],
    };
    try {
      request.uploadFile(getContext(), uploadConfig).then((data: request.UploadTask) => {
        let uploadTask = data;
        uploadTask.on('complete', (taskStates: Array<request.TaskState>) => {
          for (let i = 0; i < taskStates.length; i++) {
            console.info(upload complete taskState: ${JSON.stringify(taskStates[i])});
          }
        });
        uploadTask.on('headerReceive',(header:Object)=>{
          console.log('###headerReceive',JSON.stringify(header))
          if(header){
            let body:object = JSON.parse(JSON.stringify(header)).body
            console.log('=====body',JSON.stringify(body))
          }
        })
      }).catch((err: BusinessError) => {
        console.error(Failed to request the upload. Code: ${err.code}, message: ${err.message});
      });
    } catch (err) {
      console.error(Failed to request the upload. err: ${JSON.stringify(err)});
    }
  }
  build() {
    Column() {
      Button('上传').onClick(() => {
        console.log('123456')
        this.upload()
      })
    }.width('100%').height('100%').justifyContent(FlexAlign.Center)
  }
}