Making SSE Token Streams Resumable, Cancellable, and Multi-Device for LLM Applications
Hacker News·low signal
A blog post on HN (34pts) details the engineering challenge of making LLM token streams durable: handling page refreshes, network drops, and load balancer re-routing mid-stream. The key architecture pattern separates client connections from generation by storing individual tokens in Redis, with a consumer that replays unseen chunks on reconnect. Cancellation requires a database marker checked between tokens. Relevant as LLM streaming moves from demos to production multi-device experiences.