HarmonyOS request.downloadFile支持断点续传吗？这是个异步方法，如果同时开启多个，有性能问题吗？

try { 
  request.downloadFile(context, { 
    url: 'https://xxxx/xxxx.txt', 
    filePath: filesDir + '/xxxx.txt' 
  }).then((downloadTask: request.DownloadTask) => { 
    downloadTask.on('complete', () => { 
      console.info('download complete'); 
      let file = fs.openSync(filesDir + '/xxxx.txt', fs.OpenMode.READ_WRITE); 
      let arrayBuffer = new ArrayBuffer(1024); 
      let readLen = fs.readSync(file.fd, arrayBuffer); 
      let buf = buffer.from(arrayBuffer, 0, readLen); 
      console.info(`The content of file: ${buf.toString()}`); 
      fs.closeSync(file); 
    }) 
  }).catch((err: BusinessError) => { 
    console.error(`Invoke downloadTask failed, code is ${err.code}, message is ${err.message}`); 
  }); 
} catch (error) { 
  let err: BusinessError = error as BusinessError; 
  console.error(`Invoke downloadFile failed, code is ${err.code}, message is ${err.message}`); 
}
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