Building a Streaming AI Chat Endpoint: My Rate Limit Wake-Up Call

Short summary

A developer hits OpenAI rate limits and unacceptable wait times building a chatbot endpoint. Solution: stream responses via Server-Sent Events (SSE) for real-time typing effect, reducing latency and API waste through early cancellation. Includes working Express.js code with hard-won lessons on error handling, connection cleanup, and SSE vs WebSocket tradeoffs.

• •Blocking API calls cause rate-limit problems and poor UX; streaming solves both
• •Server-Sent Events provide simpler real-time streaming than WebSockets for one-way chat
• •Working code included with production considerations: error handling, backpressure, message queues

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