返回错误的Microsoft Websocket代码示例

using System;
using System.Net.WebSockets;
using System.Threading;
using System.Threading.Tasks;

public class WebSocketServer
{
    private const int bufferSize = 1024;
    private static WebSocket webSocket;

    public static async Task Start()
    {
        var listener = new HttpListener();
        listener.Prefixes.Add("http://localhost:8080/");
        listener.Start();
        Console.WriteLine("Listening for WebSocket connections...");

        var context = await listener.GetContextAsync();
        if (context.Request.IsWebSocketRequest)
        {
            var webSocketContext = await context.AcceptWebSocketAsync(null);
            webSocket = webSocketContext.WebSocket;
            Console.WriteLine("WebSocket connection established.");
            await Receive();
        }
        else
        {
            context.Response.StatusCode = 400;
            context.Response.Close();
            Console.WriteLine("Invalid WebSocket request.");
        }
    }

    private static async Task Receive()
    {
        var buffer = new byte[bufferSize];
        while (webSocket.State == WebSocketState.Open)
        {
            var result = await webSocket.ReceiveAsync(new ArraySegment<byte>(buffer), CancellationToken.None);
            if (result.MessageType == WebSocketMessageType.Close)
            {
                await webSocket.CloseAsync(WebSocketCloseStatus.NormalClosure, string.Empty, CancellationToken.None);
                Console.WriteLine("WebSocket connection closed.");
            }
            else
            {
                var message = System.Text.Encoding.UTF8.GetString(buffer, 0, result.Count);
                Console.WriteLine("Received message: " + message);
            }
        }
    }
}