What is SEC WebSocket protocol?

A WebSocket is a persistent bi-directional communication channel between a client (e.g. a browser) and a backend service . In contrast with HTTP request/response connections, websockets can transport any number of protocols and provide server-to-client message delivery without polling.

Django Channels facilitates support of WebSockets in Django in a manner similar to traditional HTTP views. It wraps Django’s native asynchronous view support, allowing Django projects to handle not only HTTP, but also protocols that require long-running connections, such as WebSockets, MQTT, chatbots, etc.1 Mar 2021

The Sec-WebSocket-Protocol header specifies one or more WebSocket protocols that you wish to use, in order of preference . The first one that is supported by the server will be selected and returned by the server in a Sec-WebSocket-Protocol header included in the response.

With WebSockets (via Django Channels) managing the communication between the client and the server, whenever a user is authenticated, an event will be broadcasted to every other connected user . Each user’s screen will change automatically, without them having to reload their browsers.