我正在尝试实现C#Web套接字服务器,但它给我带来了一些麻烦。我正在运行Web服务器(ASP.NET),以使用javascript托管页面,并且Web套接字服务器已实现为C#控制台应用程序。
我能够检测到来自客户端的连接尝试(运行javascript的Chrome浏览器),还可以从客户端检索握手。但是客户端似乎不接受我发回的握手信号(onopen从不调用Web套接字上的函数)。
onopen
我一直在阅读Web套接字协议,但看不到我在做什么错。以下是服务器代码:
Socket listener = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.IP); IPEndPoint ep = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 8181); listener.Bind(ep); listener.Listen(100); Console.WriteLine("Wainting for connection..."); Socket socketForClient = listener.Accept(); if (socketForClient.Connected) { Console.WriteLine("Client connected"); NetworkStream networkStream = new NetworkStream(socketForClient); System.IO.StreamWriter streamWriter = new System.IO.StreamWriter(networkStream); System.IO.StreamReader streamReader = new System.IO.StreamReader(networkStream); //read handshake from client: Console.WriteLine("HANDSHAKING..."); char[] shake = new char[255]; streamReader.Read(shake, 0, 255); string handshake = "HTTP/1.1 101 Web Socket Protocol Handshake\r\n" + "Upgrade: WebSocket\r\n" + "Connection: Upgrade\r\n" + "WebSocket-Origin: http://localhost:8080\r\n" + "WebSocket-Location: ws://localhost:8181\r\n" + "\r\n"; streamWriter.Write(handshake); streamWriter.Flush();
我正在本地主机上运行端口8080上的Web服务器和端口8181上的Web套接字服务器。
我尝试过以不同的编码(ASCII,字节和十六进制)发送握手,但这似乎没有什么区别。连接永远不会完全建立。javascript看起来像这样:
var ws; var host = 'ws://localhost:8181'; debug("Connecting to " + host + " ..."); try { ws = new WebSocket(host); } catch (err) { debug(err, 'error'); } ws.onopen = function () { debug("connected...", 'success'); }; ws.onclose = function () { debug("Socket closed!", 'error'); }; ws.onmessage = function (evt) { debug('response: ' + evt, 'response'); };
我猜测错误是C#服务器出现的,因为chrome正在按其应有的方式发送信息,但是正如所说的那样onopen,从未调用过该函数。
简而言之,我的问题是: 你们中的任何人都做到过吗?如果是,您是如何做到的?原因:在代码中是否看到任何明显的错误(希望不要问太多)
可能是编码问题。这是我编写的可运行的C#服务器:
class Program { static void Main(string[] args) { var listener = new TcpListener(IPAddress.Loopback, 8181); listener.Start(); using (var client = listener.AcceptTcpClient()) using (var stream = client.GetStream()) using (var reader = new StreamReader(stream)) using (var writer = new StreamWriter(stream)) { writer.WriteLine("HTTP/1.1 101 Web Socket Protocol Handshake"); writer.WriteLine("Upgrade: WebSocket"); writer.WriteLine("Connection: Upgrade"); writer.WriteLine("WebSocket-Origin: http://localhost:8080"); writer.WriteLine("WebSocket-Location: ws://localhost:8181/websession"); writer.WriteLine(""); } listener.Stop(); } }
以及相应的客户端托管在localhost:8080:
localhost:8080
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <script type="text/javascript"> var socket = new WebSocket('ws://localhost:8181/websession'); socket.onopen = function() { alert('handshake successfully established. May send data now...'); }; socket.onclose = function() { alert('connection closed'); }; </script> </head> <body> </body> </html>
本示例仅建立握手。建立握手后,您将需要调整服务器以继续接受数据。