Websocket server: onopen function on the web socket is never called

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Probably it’s an encoding issue. Here’s a working C# server I wrote:

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();
    }
}

And the corresponding client hosted on 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>

This example only establishes the handshake. You will need to tweak the server in order to continue accepting data once the handshake has been established.

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