interceptDownload(http, cacheControl) {
    const readStream = this.getReadStream();
    const downloadFlag = http?.params?.query?.download;

    let ret = false;
    if (readStream) {
      ret = true;
      httpStreamOutput(readStream, this.fileObj.name, http, downloadFlag, cacheControl);
    }

    return ret;
  }
download the file
@param http the current http request
@param cacheControl cacheControl of FilesCollection