.net websocket 实现 报错

Error during WebSocket handshake: Unexpected response code: 200

chrome控制台报的错误
action代码

         public HttpResponseMessage T()
        {
            if (System.Web.HttpContext.Current.IsWebSocketRequest)
            {
                System.Web.HttpContext.Current.AcceptWebSocketRequest(ProcessWSChat);
            }

            return new HttpResponseMessage(HttpStatusCode.SwitchingProtocols);
            //return View();
        }
        private async Task ProcessWSChat(AspNetWebSocketContext context)
        {
            System.Net.WebSockets.WebSocket socket = context.WebSocket;
            while (true)
            {
                //ArraySegment<byte> buffer = new ArraySegment<byte>(new byte[1024]);
                //WebSocketReceiveResult result = await socket.ReceiveAsync(
                //    buffer, CancellationToken.None);
                if (socket.State == WebSocketState.Open)
                {
                    //string userMessage = Encoding.UTF8.GetString(
                    //    buffer.Array, 0, result.Count);
                    string userMessage = DateTime.Now.ToString();
                    ArraySegment<byte> buffer = new ArraySegment<byte>(
                        Encoding.UTF8.GetBytes(userMessage));
                    await socket.SendAsync(
                        buffer, WebSocketMessageType.Text, true, CancellationToken.None);
                }
                else
                {
                    break;
                }
            }
        }

js代码

 <script type="text/javascript">
    var serverData,statusDiv,ws;
    //var SERVER_URL = "/Dou/T";
    window.onload = function () {
        ws = new WebSocket("ws://" + window.location.host  + "/Sun/T");
        serverData = document.getElementById("serverData");
        statusDiv = document.getElementById("statusDiv");
        startlistenServer();
    }
    function startlistenServer() {
        statusDiv.innerHTML="Start Connect Server...";
        //var es = new EventSource(SERVER_URL);
        ws.onopen = openHandler;
        ws.onerror = errorHandler;
        ws.onmessage = messageHandler;
    }
    function openHandler(e) {
        statusDiv.innerHTML = "Server Open<br>";
    }
    function errorHandler(e) {
        statusDiv.innerHTML = "Error<br>"+e.message;
    }
    function messageHandler(e) {
        serverData.innerHTML = e.data;
    }
</script>

    你确定HttpContext.Current 这个没错

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