websocket

https://docs.spring.io/spring/docs/4.0.1.RELEASE/spring-framework-reference/html/websocket.html

https://docs.spring.io/spring/docs/4.3.12.RELEASE/spring-framework-reference/htmlsingle/

https://spring.io/guides/gs/messaging-stomp-websocket/

https://docs.spring.io/spring-framework/docs/5.0.0.BUILD-SNAPSHOT/spring-framework-reference/html/websocket.html