Hands-On Cloud-Native Applications with Java and Quarkus

Introducing WebSockets

First off, let's briefly introduce new components for our application. WebSocket, as defined by its enterprise specification, is an API that establishes socket connections between a browser and a server endpoint. This is pretty much similar to standard TCP sockets due to its persistent connection between the client and the server, where both parties can start sending data at any time.

Typically, you would open a WebSocket connection simply by calling the WebSocket constructor in your JavaScript code:

var connection = new WebSocket('ws://localhost:8080/hello');

Notice the URL schema for WebSocket connections (ws:). We also have wss: for secure WebSocket connections, which is used in the same way as https: is for secure ...