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WebSocket Rooms: Socket.IO Internals

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Socket.IO: rooms and namespaces on WebSocket

Socket.IO wraps WebSocket with application-level routing: namespaces (like channels) and rooms (dynamic groups within a namespace). A single WebSocket connection can join many rooms and receive targeted broadcasts.

The killer feature: Socket.IO's adapter pattern makes room.emit() work across multiple server instances — essential for horizontal scaling.

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