title: Building a Chat application using Server sent Event and node.js
body: <p>I am new to node.js and SSE.
  I want to create a chat application using SSE and node.js.
  can any one guide which is better SSE or websocket?
  Is there any polyfill for IE using js not php for IE7+</p>
  
  <p>Please suggest.</p>
  
  <p>Thanks in advance.</p>