and WebSocket endpoints

WebSocket endpoints are persistent, bidirectional communication channels that enable real-time data exchange between clients and servers over a single TCP connection.

WebSocket endpoints replace the traditional overhead of HTTP polling with a full-duplex connection (RFC 6455) that stays open for the duration of a session. By initiating a handshake via the 'Upgrade' header, a standard HTTP request transforms into a continuous stream where both the server and client push data independently. This architecture is critical for low-latency systems like Slack's real-time messaging, Binance's live order books, and multiplayer gaming environments. Using the 'ws://' or 'wss://' URI schemes, these endpoints handle small, lightweight frames of text or binary data, drastically reducing latency and server load compared to repetitive request-response cycles.

https://developer.mozilla.org/en-US/docs/Web/API/WebSockets_API