问iOS MultipartUploadVodFile 上传请求超时？

网络没问题错误信息：Error Domain=NSURLErrorDomain Code=-1001 "The request timed out." UserInfo={NSErrorFailingURLStringKey=http://vod.qcloud.com/v2/index.php, _kCFStreamErrorCodeKey=-2102, NSErrorFailingURLKey=http://vod.qcloud.com/v2/index.php, NSLocalizedDescription=The request timed out., _kCFStreamErrorDomainKey=4, NSUnderlyingError=0x160acf40 {Error Domain=kCFErrorDomainCFNetwork Code=-1001 "(null)" UserInfo={_kCFStreamErrorDomainKey=4, _kCFStreamErrorCodeKey=-2102}}}