操作之间的差异有时间出来，（504）网关超时网关、差异、操作、时间

2023-09-04 02:35:28 作者：捂著心脏、逞強旳笑

我在我的应用程序，正在检查一些URI在多个线程使用的HttpWebRequest 。我得到多种类型的超时异常。

I am using HttpWebRequest in my application which is checking some URI's in multiple threads. I am getting multiple types of time out exceptions.

在该操作已超时在远程服务器返回错误：（504）网关超时

他们的细节是这样的：

System.Net.WebException：操作已超时在 System.Net.HttpWebRequest.GetResponse（）的......

System.Net.WebException: The operation has timed out at System.Net.HttpWebRequest.GetResponse() at ......

和

System.Net.WebException：远程服务器返回错误：（504）网关超时。在System.Net.HttpWebRequest.GetResponse（）在 ......

System.Net.WebException: The remote server returned an error: (504) Gateway Timeout. at System.Net.HttpWebRequest.GetResponse() at ....

这是在这两者之间的不同。

What is the different between these two.

我的功能是这样的：

public bool CheckUri(Uri m_url)
{
    try
    {
        HttpWebRequest request = HttpWebRequest.Create(m_url) as HttpWebRequest;
        request.UserAgent = "MyUserAgent";

        //For: The underlying connection was closed: An unexpected error occurred on a receive.
        request.KeepAlive = false; 
        request.ProtocolVersion = HttpVersion.Version10;

        request.Method = "HEAD"; //Get only the header information 
        using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
        {
            int statusCode = (int)response.StatusCode;
            if (statusCode >= 100 && statusCode < 400) //Good requests
            {
                string sContent = null;
                using (var stream = response.GetResponseStream())
                using (StreamReader loResponseStream = new StreamReader(stream))
                    sContent = loResponseStream.ReadToEnd();
                return true;

            }
            else
            {
                return false;
                //hard to reach here
            }
        }
    }
    //vexing exception
    catch (WebException ex)
    {
        if (ex.Status == WebExceptionStatus.ProtocolError) //400 errors
        {
            var response = ex.Response as HttpWebResponse;

            if (response != null)
            {
                Console.WriteLine("HTTP Status Code: " + (int)response.StatusCode);
                Console.WriteLine(response.StatusCode);
            }
        }
        else
        {
            Console.WriteLine(ex.Message);
        }
        return false;

    }
    catch (Exception ex)
    {
        Console.WriteLine(ex.Message);
        return false;
    }
}

此外，如果有人可以告诉我，会不会有一个问题，如果多个线程调用此方法具有不同的URI。我没有收到任何交叉线程例外。这种方法实际上是一个窗口服务，监控近200 URI列表的一部分。

Also If anyone could tell me, would there be an issue if multiple threads call this method with different URIs. I am not getting any cross thread exception. This method is actually a part of a windows service which monitors a list of almost 200 URIs.

操作之间的差异有时间出来，（504）网关超时网关、差异、操作、时间

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