UWP StreamSocket。为什么https请求工作时我的http连接失败？

Question

我正在尝试集成http的连接方法。我找到了UWP的代码：

 StreamSocket clientSocket = new StreamSocket();
        HostName serverHost = new HostName("ecosia.org");
        string serverServiceName = "https";

    // Try to connect to contoso using HTTP (port 80)
    try {
        // Call ConnectAsync method with a plain socket
        await clientSocket.ConnectAsync(serverHost, serverServiceName, SocketProtectionLevel.PlainSocket);

        NotifyUser("Connected");

    }
    catch (Exception exception) {
                    Debug.WriteLine("Connection failed.");
        // If this is an unknown status it means that the error is fatal and retry will likely fail.
        if (SocketError.GetStatus(exception.HResult) == SocketErrorStatus.Unknown) {
            throw;
        }

                    NotifyUser("Connect failed with error: " + exception.Message);//, NotifyType.ErrorMessage);
        // Could retry the connection, but for this simple example
        // just close the socket.

        clientSocket.Dispose();
        clientSocket = null; 
        return;
    }

这适用于建立https连接。但是，我需要访问一个http页面，并尝试更改前两行，如下所示：

HostName serverHost = new HostName("www.seite.com");
string serverServiceName = "http";

但这在UWP中失败了。我怎么解决这个问题？请注意，我尝试通过HttpClient类建立，我面临同样的问题。