下载一个文件,我得到的内容长度头是无效的

我正在使用以下代码从Web服务器下载文件,并收到以下错误:

从保存文件时出错URL:服务器违反了协议。

Section=ResponseHeader Detail='Content-Length'标头值无效

从运行小提琴手的同时,它说:

代码:

public static bool SaveFileFromURL(string url, string destinationFileName, int timeoutInSeconds)
        {
            //SetAllowUnsafeHeaderParsing20();
            Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
            SettingsSection section = (SettingsSection)config.GetSection("system.net/settings");
            section.HttpWebRequest.UseUnsafeHeaderParsing = false;
            config.Save();

            // Create a web request to the URL
            HttpWebRequest MyRequest = (HttpWebRequest)WebRequest.Create(url);
            MyRequest.UseDefaultCredentials = true;
            MyRequest.ContentLength = 0;

            MyRequest.Timeout = timeoutInSeconds * 1000;
            try
            {
                // Get the web response
                HttpWebResponse MyResponse = (HttpWebResponse)MyRequest.GetResponse();

                // Make sure the response is valid
                if (HttpStatusCode.OK == MyResponse.StatusCode)
                {
                    // Open the response stream
                    using (Stream MyResponseStream = MyResponse.GetResponseStream())
                    {
                        // Open the destination file
                        using (FileStream MyFileStream = new FileStream(destinationFileName, FileMode.OpenOrCreate, FileAccess.Write))
                        {
                            // Create a 4K buffer to chunk the file
                            byte[] MyBuffer = new byte[4096];
                            int BytesRead;
                            // Read the chunk of the web response into the buffer
                            while (0 < (BytesRead = MyResponseStream.Read(MyBuffer, 0, MyBuffer.Length)))
                            {
                                // Write the chunk from the buffer to the file
                                MyFileStream.Write(MyBuffer, 0, BytesRead);
                            }
                        }
                    }
                }
            }
            catch (Exception err)
            {
                throw new Exception("Error saving file from URL:" + err.Message, err);
            }
            return true;
        }

更新 :如果我将URL直接传递到浏览器中,则文件将成功下载,并在GetResponse行引发错误。

更新2 :我得到相同的错误WebClient下载文件:

public static bool DL_Webclient(string url, string destinationFileName)
{
    WebClient myWebClient = new WebClient();
    myWebClient.UseDefaultCredentials = true;
    myWebClient.DownloadFile(url, destinationFileName);

    return true;
}

:在检索到邮件中的其他标题(使用Fiddler)后,它们是:

HTTP/1.1 200 OK
Connection: close
Date: Wed, 03 Mar 2010 08:43:06 GMT
Server: Microsoft-IIS/6.0
X-Powered-By: ASP.NET
Content-Length: 13314320
Content-Type: application/x-evsaveset
Set-Cookie: ASPSESSIONIDQQCQSCRC=CFHHJHADOIBCFAFOHFJCDNEG; path=/
Cache-control: private