HarmonyOS通过 rawfile 中内容构造请求失败

return getContext(this).resourceManager.getRawFd(this._dir + "/" + assetPath) 
  .then((rawFile) => { 
    RLogger.debug(TAG, "hit cache " + fileUrl + ", {" + rawFile.fd + ", " + rawFile.length + "}") 
    return new CacheEntry(rawFile.fd, rawFile.length, fileUrl, url) 
  })

static updateSuccessCacheResponse(cacheEntry: CacheEntry, webResponse: WebResourceResponse): WebResourceResponse { 
  let mimeType = MimeUtils.getMimeType(RequestUtils.getExtensionFromUrl(cacheEntry.remoteUrl)) 
  return RequestUtils.updateSuccessResponse(cacheEntry.fd, mimeType, webResponse) 
} 
private static updateSuccessResponse(data: ArrayBuffer|number, mimeType: string|undefined, webResponse: WebResourceResponse): WebResourceResponse { 
  webResponse.setResponseEncoding('utf-8'); 
  webResponse.setResponseData(data); 
  if (mimeType !== undefined) { 
    webResponse.setResponseMimeType(mimeType); 
  } 
  webResponse.setResponseCode(200); 
  webResponse.setReasonMessage('OK'); 
  webResponse.setResponseHeader([{ 
    headerKey: 'Access-Control-Allow-Origin', 
    headerValue: '*' 
  }]) 
  webResponse.setResponseIsReady(true); 
  return webResponse 
}