Spring SSE Reference SSE https://tecoble.techcourse.co.kr/post/2022-10-11-server-sent-events/ https://www.baeldung.com/spring-server-sent-events SSE troubleshooting https://gong-check.github.io/dev-blog/BE/%EC%96%B4%EC%8D%B8%EC%98%A4/sse/sse/ https://velog.io/@kimgunwooo/SSEServer-Sent-Events-%ED%8A%B8%EB%9F%AC%EB%B8%94%EC%8A%88%ED%8C%85 Redis Pub/Sub https://docs.spring.io/spring-data/redis/reference/redis/pubsub.html Redis serialization & deserialization https://mangkyu.tistory.com/402 https://unluckyjung.github.io/spring/2023/03/11/spring-redisTemplate/ https://unluckyjung.github.io/spring/2023/11/26/redis-template-wrapping/