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Socket.IO: Rooms, Namespaces & Scaling

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Socket.IO: reliable real-time over HTTP infrastructure

WebSocket is ideal but not universal — corporate proxies, some CDNs, and older browsers can break raw WebSocket connections. Socket.IO starts with HTTP long-polling (which works everywhere) and upgrades to WebSocket when possible.

On top of this transport layer, Socket.IO adds rooms (group messaging), namespaces (logical channel separation), and automatic reconnection. The tradeoff: slightly more complexity than raw WebSocket.

Packets in motion — click to inspect:

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