WebSocket API for real-time session

WebSocket API establishes a persistent, full-duplex TCP connection between client and server for sub-100ms data exchange.

Modern interactive apps require more than the overhead-heavy HTTP request-response cycle. The WebSocket API (RFC 6455) solves this by upgrading a standard HTTP handshake into a single, long-lived connection. This allows servers to push updates (like live stock tickers or chat messages) the millisecond they occur without waiting for a client poll. By utilizing a binary or text-based framing protocol, it reduces header overhead from kilobytes to just 2-14 bytes per message. For high-concurrency environments like multiplayer gaming or collaborative document editing, this protocol is the industry standard for maintaining stateful, low-latency sessions.

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