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websocket-pro

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WebSocket guidance — connection lifecycle, scaling with pub/sub, auth, heartbeats, and fallbacks.

skills/websocket-pro/SKILL.md

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## Overview

WebSockets give you full-duplex, low-latency messaging over a single long-lived connection — the foundation of chat, live dashboards, collaborative editing, and realtime games. The protocol is simple; operating it is not: connection state, horizontal scaling, reconnection, and backpressure are where projects fail. This skill covers building realtime features on WebSockets that survive production, including when to choose SSE or polling instead.

## When to use

- Adding realtime features (chat, notifications, live updates, collaboration).
- Scaling WebSocket servers horizontally.
- Designing reconnection and message-delivery semantics.
- Choosing between WebSockets, SSE, long-polling, and WebRTC data channels.
- Authenticating and authorizing persistent connections.
- Debugging dropped connections, memory leaks, and thundering herds.

## Core concepts
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