c# - 底层连接已关闭: An unexpected error occurred on a receive

Question

使用在 Azure 上作为计划任务运行的控制台应用程序来处理 Azure 上所有长时间运行的网页。

几分钟后出现问题:底层连接已关闭:接收时发生意外错误

 //// used as WebClient doesn't support timeout
public class ExtendedWebClient : WebClient
{
    public int Timeout { get; set; }

    protected override WebRequest GetWebRequest(Uri address)
    {
        HttpWebRequest request = (HttpWebRequest)base.GetWebRequest(address);
        if (request != null)
            request.Timeout = Timeout;
        request.KeepAlive = false;
        request.ProtocolVersion = HttpVersion.Version10;
        return request;
    }

    public ExtendedWebClient()
    {
        Timeout = 1000000; // in ms.. the standard is 100,000
    }
}

class Program
{
    static void Main(string[] args)
    {
        var taskUrl = "http://www.secret.com/secret.aspx";
        // create a webclient and issue an HTTP get to our url
        using (ExtendedWebClient httpRequest = new ExtendedWebClient())
        {
            var output = httpRequest.DownloadString(taskUrl);
        }
    }
}

Answer 1

请注意，Windows Azure 负载平衡器会在 60 秒后终止空闲 TCP 连接。看起来您正在通过负载均衡器进行调用...是否有可能该操作花费的时间超过 60 秒而没有发送任何内容？