SseEventBuilder event = SseEmitter.event()
.name("event1")
.data("Hello")
.name("event2")
.data("World");
emitter.send(event);
SseEventBuilder event1 = SseEmitter....
emitter.send(event1);
SseEventBuilder event2 = SseEmitter....
emitter.send(event2);
static interface
extends ResponseBodyEmitter и можно было догадаться. https://www.baeldung.com/spring-server-sent-events