HarmonyOS鸿蒙Next中本地服务使用downloadFile局域网下载失败，可能是什么引起的

开发者您好，为了进一步分析问题，麻烦请提供一下信息：

1. 麻烦提供下完整点的代码demo，本地测试官网的代码demo没有复现出来开发者的问题，代码如下：

// 请在组件内获取context，确保this.getUIContext().getHostContext()返回结果为UIAbilityContext
let context = this.getUIContext().getHostContext() as common.UIAbilityContext;
try {
  // 需要手动将url替换为真实服务器的HTTP协议地址
  request.downloadFile(context, { url: 'xxxxxxxxx' }).then((data: request.DownloadTask) => {
    let downloadTask: request.DownloadTask = data;
    let progressCallback = (receivedSize: number, totalSize: number) => {
      console.info("download receivedSize:" + receivedSize + " totalSize:" + totalSize);
    };
    downloadTask.on('progress', progressCallback);
    let failCallback = (err: number) => {
      console.error(`Failed to download the task. Code: ${err}`);
    };
    downloadTask.on('fail', failCallback);
  }).catch((err: BusinessError) => {
    console.error(`Failed to request the download. Code: ${err.code}, message: ${err.message}`);
  })
} catch (err) {
  console.error(`Failed to request the download. Code: ${err.code}, message: ${err.message}`);
}

1. 只是局域网络下载失败吗，其他网络下载是否正常，比如外部公共网络。