Question

尝试使用JavScript客户端和ASP.NET服务器实现基本WebSockets通道。客户端代码：

function Connect()
{
    var ws = new WebSocket("ws://" + window.location.host + "/callback.aspx");
    ws.onmessage = function (a) { alert("Message"); };
    ws.onopen = function (a) { alert("Open"); };
    ws.onerror = function (a) { alert("Error"); };
}

Callback.aspx是一个基本的ASP.NET网页，它是：

protected void Page_Load(object sender, EventArgs e)
{
    if (HttpContext.Current.IsWebSocketRequest)
    {
        HttpContext.Current.AcceptWebSocketRequest(SocketProc);
    }
}

private static async Task SocketProc(AspNetWebSocketContext a)
{
    try
    {
        ArraySegment<byte> Buffer = new ArraySegment<byte>(new Byte[1024]);
        while (true)
        {
            WebSocketReceiveResult res = await a.WebSocket.ReceiveAsync(Buffer, CancellationToken.None);
            if (a.WebSocket.State != WebSocketState.Open)
                return;
        }
    }
    catch (Exception exc)
    {
        Debug.WriteLine(exc);
    }
}

当我尝试从客户端连接时，调用Page_Load，然后调用SocketProc，然后ReceiveAsync立即抛出以下异常：

System.Net.WebSockets.WebSocketException (0x800703E3): The I/O operation has been aborted because of either a thread exit or an application request
at System.Web.WebSockets.WebSocketPipe.<>c__DisplayClass9_0.<ReadFragmentAsync>b__0(Int32 hrError, Int32 cbIO, Boolean fUtf8Encoded, Boolean fFinalFragment, Boolean fClose)
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Web.WebSockets.AspNetWebSocket.<DoWork>d__45`1.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Web.WebSockets.AspNetWebSocket.<>c__DisplayClass36_0.<<ReceiveAsyncImpl>b__0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
at CleanProxy.callback.<SocketProc>d__2.MoveNext() in C:\dev\CleanModel\CleanProxy\callback.aspx.cs:line 37

在客户端上，OnOpen触发，然后是OnError。

如果我在ReceiveAsync附近立即捕获异常，则WebSocket对象将关闭。

我在这里缺少什么？在IIS Express和IIS中的Windows Server 2016上进行测试。

编辑：我一直在测试内置的IE，但我现在尝试使用Chrome并遇到了不同的错误。这一次，没有异常，ReceiveAsync返回MessageType = Close，CloseStatus = ProtocolError的对象。在客户端上，Chrome控制台出现错误：

WebSocket connection to 'ws://localhost:53329/callback.aspx' failed: Invalid frame header

EDIT2：它以某种方式使用HTTP处理程序而不是ASPX页面。辣妈。没有要求使用经典的ASP.NET，所以现在这样做，但问题可能仍未解决。

WebSocketException：“I / O操作已中止”

0 个答案: