c# httpwebrequest getResponse() 冻结并挂起我的程序

Question

我试图使用 httpwebrequest 在远程服务器上使用类似于休息的服务，从第一次执行本身开始，我的代码就挂起了程序。然后我尝试将它作为控制台应用程序，以确保它与程序本身无关，但没有运气！

        string credentialsJson = @"{""username"":""test"",
                                      ""password"":""test"" 
                                   }";

        int tmp = ServicePointManager.DefaultConnectionLimit;
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(@"https://qrua.com/qr/service" + @"/auth/login");
        request.Method = "POST";
        request.KeepAlive = true;
        request.Timeout = 50000 ;
        request.CookieContainer = new CookieContainer();
        request.ContentType = "application/json";
        try
        {
            StreamWriter writer = new StreamWriter(request.GetRequestStream());
            writer.Write(credentialsJson);
        }
        catch (Exception e)
        {
            Console.WriteLine("EXCEPTION:" + e.Message);
        }

        //WebResponse response = request.GetResponse();
        try
        {
            using (WebResponse response = (HttpWebResponse)request.GetResponse())
            {
                Console.WriteLine("request:\n" + request.ToString() + "\nresponse:\n" + response.ContentLength);
                response.Close();
            }
        }
        catch (Exception e)
        {
            Console.WriteLine("EXCEPTION: in sending http request:" + " \nError message:" + e.Message);
        }

尝试了不同论坛的几种方法，但没有帮助。即使是具有上述代码的简单控制台应用程序也会无限期地挂起控制台！任何帮助都会很棒..

谢谢

Answer 1

你永远不会关闭StreamWriter...所以我怀疑它没有被刷新。诚然，我希望服务器会出现错误，而不仅仅是挂起，但它值得一看。

顺便说一句，您不需要关闭响应并处置它。只需 using 语句就足够了。

Answer 2

如果远程服务器没有响应，除了定义一个超时并捕获异常，以通知用户操作无法完成，因为远程站点没有响应，您无能为力。响应：

var request = (HttpWebRequest)WebRequest.Create("https://qrua.com/qr/service/auth/login");
request.Timeout = 5000;
// If the server doesn't respond within 5 seconds you might catch the timeout exception
using (var response = request.GetResponse())
{

}

如果您不想冻结 UI，可以使用异步版本：BeginGetResponse

Answer 3

尝试指定 request.ContentLength。

在做之前：

        StreamWriter writer = new StreamWriter(request.GetRequestStream());
        writer.Write(credentialsJson);

尝试这样的事情：

using (MemoryStream stream = new MemoryStream())
{
    using (var writer = StreamWriter writer = new StreamWriter(stream))
    {
        writer.Write(credentialsJson);
        writer.Close();
    }
    request.ContentLength = stream.Length;
}