Fleck is a WebSocket server implementation in C# with NET 2.0 support.

This project is a fork of Fleck branched from the Nugget project. Fleck requires no inheritance, container, or additional references.

Install-Package Fleck2

Run build.bat from the commandline and release dll will be created for NET 2.0, 3.5, 4.0 and 4.5.

NET Framework 2.0 or newer.

The following is an example that will echo to a client.

var server = new WebSocketServer("ws://localhost:8181");
server.Start(socket =>
  {
    socket.OnOpen = () => Console.WriteLine("Open!");
    socket.OnClose = () => Console.WriteLine("Close!");
    socket.OnMessage = message => socket.Send(message);
  });
        

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+)

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://localhost:8431");
server.Certificate = new X509Certificate2("MyCert.pfx");
server.Start(socket =>
  {
    //...use as normal
  });

The MIT License

Copyright (c) 2013 Peter Sunde

Copyright (c) 2010-2012 Jason Staten

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.