推荐几个 WebSocket 服务端实现

http://netty.io/
http://socket.io/
https://github.com/StackExchange/NetGain
https://github.com/SignalR/SignalR

https://github.com/uWebSockets

https://github.com/statianzo/Fleck

https://github.com/sta/websocket-sharp

https://github.com/vtortola/WebSocketListener

https://www.oschina.net/translate/websocket-libraries-comparison-2