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Streaming an AI chat from Python FastAPI through a Next.js proxy: the four annoying details

This story is from 2026-09-28. It is preserved in the archive; the latest stories are on the live feed.

Streaming chat looks trivial in tutorials: for chunk in response: print(chunk.text) . It stops looking trivial the moment you add the things a real product needs — a logged-in user, a provider that can be swapped at runtime, a cost record per request, and an error that happens after you already sen…

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  1. 2026-09-28 14:03 · DEV Community — AI
    Streaming an AI chat from Python FastAPI through a Next.js proxy: the four annoying details

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