Real-Time / Streaming

HTTP is request-response — the client must ask. Real-time requires the server to push. WebSocket gives you a persistent bidirectional connection with sub-50ms latency, but scale to multiple servers and you have a problem: User A is on Server 1, User B is on Server 2. A pub-sub layer (Redis or Kafka) bridges them — Server 1 publishes, Server 2 delivers.

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