The independent, practitioner-built reference for WebSocket technology. Protocol internals, production patterns, scaling guides, and honest protocol comparisons with real code.
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Test WebSocket connections in real time. Send messages and see them echoed back instantly — no signup, no setup.
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Find your protocolHow it works
One request, one response. Connection closes. Every interaction has overhead.
Server streams to client only. Great for push — can't send back.
Full-duplex, persistent. Both sides send whenever they want.
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