[Update Links] Complete Intro to Real-Time | FrontendMasters

Build apps where the client can push messages to the server and talk in real-time! You’ll start by learning long polling with Vanilla JavaScript and Node.js, then open web sockets by hand, and finally, you’ll learn some excellent web socket abstractions with SocketIO. You’ll learn back off and retry strategies along the way, as well as use HTTP2 push in the browser!

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