HttpWebRequest throws System.Net.WebException Section=Respon

我编写了一个简单的httpserver，计划与HttpRequest/Response交互。服务器收到请求，解析很好，但当我写回时，我得到了异常

System.Net.WebException: Der Server hat eine Protokollverletzung ausgeführt. Section=ResponseStatusLine
   bei System.Net.HttpWebRequest.GetResponse()

我写回的服务器代码

TcpClient client = ...;
_stream = _client.GetStream();

// make sure "'r'n" is used as line ending, because it may be different on different OS
_output = new StreamWriter(_stream, Encoding.UTF8) { NewLine = "'r'n" };
length = 0;
code = 200;
message = "OK";
_output.WriteLine("HTTP/1.1 " + code + " " + message);
_output.WriteLine("Server: My Server");
_output.WriteLine("ContentLength: " + length);
_output.WriteLine("Connection: " + (_keepAlive ? "Keep-Alive" : "Close"));
_output.WriteLine();
_output.Flush();

客户端代码

var request = (HttpWebRequest)WebRequest.Create("http://127.0.0.1:8080/foo");
request.KeepAlive = false;
request.ServicePoint.Expect100Continue = false;
using (var res = request.GetResponse())   // throws here
{
}

知道吗？

更新：正如Jon提到的，第一个错误被删除，但仍然不能正常工作

备用客户端代码

using (var client = new TcpClient())
{
    client.Connect(new IPEndPoint(IPAddress.Loopback, 8080));
    using (var stream = client.GetStream())
    {
        var writer = new StreamWriter(stream);
        writer.WriteLine("GET /foo HTTP/1.1");
        writer.WriteLine("HOST:127.0.0.1");
        writer.WriteLine("Connection:Close");
        writer.WriteLine();
        writer.Flush();
        var response = new StreamReader(stream).ReadToEnd();
        foreach (var c in response)
        {
            if (char.IsControl(c))
                Console.Write("'{0}'" , (int)c);
            else
                Console.Write(c);
        }
    }
}

返回

HTTP/1.1 200 OK'13''10'Server: My custom Server'13''10'ContentLength: 0'13''10'Connection: Close'13''10''13''10'

_output = new StreamWriter(_stream, Encoding.UTF8) { NewLine = "'n'r" };