上传图片，请求发出好久之后才返回，错误请求连接超时 1001。
<QNResponseInfo= id: 1441090202646251, status: -1001, requestId: (null), xlog: (null), xvia: (null), host: up.qiniu.com ip: (null) duration: 60.032909 s time: 1441090322 error: Error Domain=NSURLErrorDomain Code=-1001 "The request timed out." UserInfo=0x7fa5acc46020 {NSUnderlyingError=0x7fa5ac9f5e50 "The operation couldn’t be completed. (kCFErrorDomainCFNetwork error -1001.)", NSErrorFailingURLStringKey=http://183.136.139.10:80/, NSErrorFailingURLKey=http://183.136.139.10:80/, NSLocalizedDescription=The request timed out.}>
使用的SDK版本 V7.0.12，