<p>My web app is a NodeJS + ReactJS app. I want to send notifications on follow user, upvote content, etc. Which technique should I use for the real time notification? </p>
<ul>
<li>Long-polling  </li>
<li>Server-Sent Events  </li>
<li>WebSockets</li>
</ul>


My web app is a NodeJS + ReactJS app. I want to send notifications on follow user, upvote content, etc. Which technique should I use for the real time notification? 

- Long-polling  
- Server-Sent Events  
- WebSockets

Which real-time notification technique should I use?

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