JavaScript: Moving to ES2015

Summary

In this chapter, we learned the fundamentals of the WebSocket protocol. We learned about its relationship with HTTP and how it behaves with proxies, load balancers, and firewalls. Then, we jumped into the Socket.IO library, which primarily uses WebSocket to achieve bidirectional full-duplex communication in real time. You should be comfortable with implementing bidirectional communication between a browser and a Node.js server.

In the next chapter, we will build a real-world application using Socket.IO. You will learn more advanced things, such as integrating a Socket.IO server with an Express server and checking authentication before connecting to a WebSocket server.