title: How to implement Long Polling REST endpoint in Spring Boot app?
body: <p>Would you be so kind as to share any up-to-date manual or explain here how to implement a REST Long Polling endpoint with the latest Spring (Spring Boot)?</p>
  
  <p>Everything that I've found by this time is quite out-dated and was issued a couple of years ago.</p>
  
  <p>So, I've raised a question is Long Polling still a good approach? I know it's used in chess.com</p>