title: Angular 4: Chat application - Receiving messages from the server
body: <p>I am trying to build a new chat application in Angular4. I am able to send the messages using POST. Now I am working on the receiving part. I did some research and found out that some of them used Signalr/long polling/websocket/socket.io. 
  I tried POC for all of them but couldn't able to come to a decision.</p>