Socket IO


### Socket - Namespace - Room(Channel)
- socket - client
> - id
> - handshake
>> - time
>> - address
>> - headers
- io - clients 
### Redis session share 로 멀티 인스턴스 공유 구현하기도






### Funny demo chat page
> [Socket.IO - Chat](https://socket.io/demos/chat)

### [Socket.io](http://socket.io) Full Usage
> [Send response to all clients except sender](https://stackoverflow.com/questions/10058226/send-response-to-all-clients-except-sender)

### [Socket.io](http://socket.io) Emit Sheet
> [Emit cheatsheet](https://socket.io/docs/emit-cheatsheet/)

> [websocket, socket.io를 이용한 양방향 통신](http://www.secmem.org/blog/2019/08/17/websocket-socketio/)

> [Socket.IO](https://socket.io/)

> [socket.io와 websocket의 차이점](https://www.it-swarm.dev/ko/node.js/socketio%EC%99%80-websocket%EC%9D%98-%EC%B0%A8%EC%9D%B4%EC%A0%90/1067384250/)

> [NAVER D2](https://d2.naver.com/helloworld/1336)





