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我的代码发出https请求.这是我的代码

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(UploadUrl);
            request.Method = "POST";
            request.KeepAlive = false;
            request.Credentials = new NetworkCredential(userid, testpwd);

            postData = "<root></root>";
            request.ContentType = "application/x-www-form-urlencoded";

            byte[] postDataBytes = Encoding.UTF8.GetBytes(postData);
            request.ContentLength = postDataBytes.Length;

            Stream requestStream = request.GetRequestStream();
            requestStream.Write(postDataBytes, 0, postDataBytes.Length);
            requestStream.Close();

            using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
            {
                StreamReader responseReader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
                var result = responseReader.ReadToEnd();
                responseReader.Close();
                Console.WriteLine(result);
            }

这段代码运行良好但突然抛出异常

System.Net.WebException

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异常消息是:基础连接已关闭:发送时发生意外错误.

堆栈跟踪:位于System.Net.HttpWebRequest.GetRequestStream(TransportContext&context)的System.Net.HttpWebRequest.GetRequestStream(),位于CustomerProcessor.Delivery.Deliver(String content,Int32 productCategory,String identifier,String xsltFile)

Exception有一个内部异常:发生异常:System.IO.IOException异常消息是:从传输流中收到意外的EOF或0字节.

堆栈跟踪:System.Net上的System.Net.FixedSizeReader.ReadPacket(Byte []缓冲区,Int32偏移量,Int32计数)处于System.Net的System.Net.Security.SslState.StartReadFrame(Byte []缓冲区,Int32 readBytes,AsyncProtocolRequest asyncRequest).在System.Net.Security.SslState.StartSendBlob(Byte []传入,Int32计数,System.SNet.Security.SslState.CheckCompletionBeforeNextReceive(ProtocolToken消息,AsyncProtocolRequest asyncRequest)上的Security.SslState.StartReceiveBlob(Byte []缓冲区,AsyncProtocolRequest asyncRequest),位于System.Net.TlsStream.CallProcessAuthentication(对象状态)的System.Net.Security.SslState.ProcessAuthentication(LazyAsyncResult lazyResult)的System.Net.Security.SslState.ForceAuthentication(Boolean receiveFirst,Byte [] buffer,AsyncProtocolRequest asyncRequest)中的AsyncProtocolRequest asyncRequest) …