Server-Sent-Events

https://en.wikipedia.org/wiki/Server-sent_events

https://www.youtube.com/watch?v=2To3_mYT2hc&t=8s

https://developer.mozilla.org/en-US/docs/Web/API/Server-sent_events

https://docs.spring.io/spring-framework/docs/current/reference/html/web.html#mvc-ann-async-sse