HttpWebRequest 上传文件原因 操作超时 WebException

Question

我一直在寻找答案，但真的不知道是什么导致了我的问题。 我正在使用 HttpWebRequest 将文件上传到我的服务器，该方案应该是正确的：
1. 组合多部分表单数据、边界和尾部。
2. 结合表单数据、文件的长度来设置请求的内容长度。
3.直接写入流并跟踪上传进度。

这是我正在使用的代码：

        HttpWebRequest uploadWebRequest = Func.UploadFileCompose(string.Format("url?hash={0}", uploadKeys.hash), cookieCollection);
        string headerTemplate = "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: {2}\r\n\r\n";
        string header = string.Format(headerTemplate, "video", Path.GetFileName(videoModel.DownloadedLocation), "video/mp4");
        byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(header);
        byte[] trailer = System.Text.Encoding.ASCII.GetBytes("\r\n--" + Func.boundary + "--\r\n");
        long totalBytes = 0;
        using(FileStream fileStream = new FileStream(videoModel.DownloadedLocation,FileMode.Open, FileAccess.Read))
        {
            totalBytes += headerbytes.Length;
            totalBytes += fileStream.Length;
            totalBytes += trailer.Length;
        }
        uploadWebRequest.ContentLength = totalBytes;

        using (Stream requestStream = uploadWebRequest.GetRequestStream())
        {
            requestStream.ReadTimeout = 10000;
            requestStream.WriteTimeout = 10000;

            //write header first
            requestStream.Write(headerbytes, 0, headerbytes.Length);

            using (FileStream fileStream = new FileStream(videoModel.DownloadedLocation, FileMode.Open, FileAccess.Read))
            {
                int bytesRead = 0;
                long bytesSent = 0;
                byte[] buffer = new byte[1024000];
                while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
                {
                    bytesSent += bytesRead;
                    requestStream.Write(buffer, 0, bytesRead);
                    decimal percentage = (decimal)(bytesSent * 100) / (decimal)fileStream.Length;
                    if (Math.Round(percentage, 1) % 0.2M == 0)
                    {
                        Func.SetProgressStatus(lvStatus, "Uploaded: " + Math.Round(percentage, 1) + "%");
                    }
                }
            }
            //write trailer
            requestStream.Write(trailer, 0, trailer.Length);
        }
        string uploadResponseInStr = "";
        using (HttpWebResponse response = (HttpWebResponse)uploadWebRequest.GetResponse())
        {
            var encoding = ASCIIEncoding.ASCII;
            try
            {
                using (var reader = new System.IO.StreamReader(response.GetResponseStream(), encoding))
                {
                    uploadResponseInStr = await reader.ReadToEndAsync();
                }
            }
            catch (Exception e1)
            {
                return null;
            }
        }

试图设置

        req.KeepAlive = true; //true or false
        req.Timeout = 10000;
        req.ReadWriteTimeout = 10000;
        req.ProtocolVersion = HttpVersion.Version10; // 11 or 10

没有帮助。
提前感谢您的帮助。 真的很感激！

编辑：设置 DefaultConnectionLimit 等于 1000 没有帮助。
连接已建立，但在引发异常之前只上传了几 MB

Answer 1

解决了。​​！
此请求缺少边界且长度不正确。
也有必要将边界写入流。