WebClient修改远程文件时：“远程服务器返回错误: (501) 未实现”的错误_十步一杀

            clientDownload = new WebClient();           
            Stream stream = clientDownload.OpenWrite(new Uri(remoteUrl + "/aa/aa.txt"), "PUT");
            byte[] buffer = ASCIIEncoding.Default.GetBytes("bb");
            stream.Write(buffer, 0, buffer.Length);
            stream.Close();            clientDownload = new WebClient(