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Fleck is a WebSocket server implementation in C#. Branched from the Nugget project, Fleck requires no inheritance, container, or additional references.
Example
The following is an example that will echo to a client.
var server = new WebSocketServer(“ws://0.0.0.0:8181”);
server.Start(socket =>
{
socket.OnOpen = () => Console.WriteLine(“Open!”);
socket.OnClose = () => Console.WriteLine(“Close!”);
socket.OnMessage = message => socket.Send(message);
});
Supported WebSocket Versions
Fleck supports several WebSocket versions of modern web browsers
Hixie-Draft-76/Hybi-00 (Safari 5, Chrome < 14, Firefox 4 (when enabled))
Hybi-07 (Firefox 6)
Hybi-10 (Chrome 14-16, Firefox 7)
Hybi-13 (Chrome 17+)
Secure WebSockets (wss://)
Enabling secure connections requires two things: using the scheme wss instead of ws, and pointing Fleck to an x509 certificate containing a public and private key
var server = new WebSocketServer(“wss://0.0.0.0:8431”);
server.Certificate = new X509Certificate2(“MyCert.pfx”);
server.Start(socket =>
{
//…use as normal
});
SubProtocol Negotiation
To enable negotiation of subprotocols, specify the supported protocols on theWebSocketServer.SupportedSubProtocolsproperty. The negotiated subprotocol will be available on the socket’s ConnectionInfo.NegotiatedSubProtocol.
If no supported subprotocols are found on the client request (the Sec-WebSocket-Protocol header), the connection will be closed.
var server = new WebSocketServer(“ws://0.0.0.0:8181”);
server.SupportedSubProtocols = new []{ “superchat”, “chat” };
server.Start(socket =>
{
//socket.ConnectionInfo.NegotiatedSubProtocol is populated
});
Custom Logging
Fleck can log into Log4Net or any other third party logging system. Just override the FleckLog.LogAction property with the desired behavior.
ILog logger = LogManager.GetLogger(typeof(FleckLog));
FleckLog.LogAction = (level, message, ex) => {
switch(level) {
case LogLevel.Debug:
logger.Debug(message, ex);
break;
case LogLevel.Error:
logger.Error(message, ex);
break;
case LogLevel.Warn:
logger.Warn(message, ex);
break;
default:
logger.Info(message, ex);
break;
}
};
Disable Nagle’s Algorithm
Set NoDelay to true on the WebSocketConnection.ListenerSocket
var server = new WebSocketServer(“ws://0.0.0.0:8181”);
server.ListenerSocket.NoDelay = true;
server.Start(socket =>
{
//Child connections will not use Nagle’s Algorithm
});
Auto Restart After Listen Error
Set RestartAfterListenError to true on the WebSocketConnection
var server = new WebSocketServer(“ws://0.0.0.0:8181”);
server.RestartAfterListenError = true;
server.Start(socket =>
{
//…use as normal
});
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