WebRequest在Mono中超时

Question

我正在尝试向服务器发送POST请求。我使用.NET 4.5（从服务器获得OK）的代码可以正常工作但是使用Mono我得到一个WebException，说请求超时。

使用像HttpRequester这样的程序发送POST请求也对我有用，所以它不是服务器。我听说Mono没有TLS 1.1和TLS 1.2的实现，但我不知道这是不是问题。我使用相同的机器运行.NET（Visual Studio）和Mono。

的应用程序

public static void Main(string[] args)
    {
        ServicePointManager.ServerCertificateValidationCallback += (s, e, i, o) => true; // Trust all certificates (debug)
        var url = "https://pgorelease.nianticlabs.com/plfe/rpc";

        var requestData = "Hello World!";
        var byteArray = Encoding.UTF8.GetBytes(requestData);

        var request = (HttpWebRequest)WebRequest.Create(url);
        request.Proxy = null;
        request.UserAgent = "Niantic App";
        request.Method = "POST";
        request.KeepAlive = true;
        request.Accept = "*/*";
        request.ContentType = "application/x-www-form-urlencoded";
        request.ContentLength = byteArray.Length;
        request.AllowAutoRedirect = false;
        request.Expect = "200";
        request.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;
        request.Timeout = 30000;

        using (var stream = request.GetRequestStream())
        {
            stream.Write(byteArray, 0, byteArray.Length);
        }

        try
        {
            var response = (HttpWebResponse)request.GetResponse();
            using (var stream = response.GetResponseStream())
            {
                // print response
            }
        }
        catch (WebException ex)
        {
            // if response available print response, else print exception
        }

        Console.ReadLine();
    }