Question

确定。这是完整的代码。我试图重用连接设置KeepAlive，但它根本不起作用。我使用Feedler和Charles查看了Http消息，但我能看到的只有Connection：关闭响应。

我看到有10个线程打开等待状态的600个TCP连接。每个线程一次运行一个http请求。

还有很多回复说 - 未经身份验证的请求。该服务需要摘要式身份验证。代码显然是静态的，只是从不同的线程运行相同的请求几百次...那么为什么有些请求无法进行身份验证？我

    static void GetRest(string rest)
    {
        int i = Interlocked.Increment(ref counter);

        Uri uri = new Uri(rest);
        CredentialCache cc = new CredentialCache();
        cc.Add(uri, "Digest", new NetworkCredential("zz", "zz"));

        ServicePointManager.FindServicePoint(uri).SetTcpKeepAlive(true, 6000000, 100000);
        ServicePointManager.FindServicePoint(uri).ConnectionLimit = 5;

        while (!stop)
        {

            HttpWebRequest req = WebRequest.Create(rest) as HttpWebRequest;

            req.Credentials = cc;
            req.Method = "GET";
            req.Timeout = timeout;
            req.KeepAlive = true;

            try
            {
                using (HttpWebResponse res = (HttpWebResponse)req.GetResponse())
                {
                    StreamReader sr = new StreamReader(res.GetResponseStream());

                    string result = sr.ReadToEnd().Substring(0, 20);
                    int rc = Interlocked.Increment(ref responseCounter);
                    Console.Write(".");

                    Thread.Sleep(20);
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine("EXCEPTION {0}, {1}", i, ex.Message);
                Interlocked.Increment(ref badResponseCounter);
            }
        }

        Interlocked.Decrement(ref counter);
    }

Answer 1

如果您在响应中看到Connection：Close，这是否表明服务器在每次请求后都强制关闭连接。我不确定此时你能做些什么来改变这种行为。也许您可以询问服务提供商他们为什么要返回Connection：在每个响应中关闭。

Answer 2

在我设置request.UnsafeAuthenticatedConnectionSharing = true后，我遇到了类似的问题。 ServicePointManager.MaxServicePointIdleTime = 100000; //不能为0

C＃Cant重用Http连接。没有KeepAlive标头。 HttpWebRequest.KeepAlive = true;

2 个答案: