What are WebSockets used for? Key use cases and who uses them today

You can use this to make sure that the client is still connected, for example. Additionally, the server can decide on extension/subprotocol requests here; see Miscellaneous for details. The Sec-WebSocket-Accept header is important in that the server must derive it from the Sec-WebSocket-Key that the client sent to it. WebSocket what is websocket client applications use the WebSocket API to communicate with WebSocket servers using the WebSocket protocol. Some libraries, like WS, do not always provide a mechanism to automatically reconnect to the server. You will probably need this feature if your backend unexpectedly restarts (which can happen after each deployment ).

Since the user will have been deleted from users, the client will basically get the message that someone disconnected. For example, if you are building a chat application, you could add a typingStatus and onlineStatus (personally, I look forward to being « out for lunch