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Guide25.1K views1,329 votes0 replies1,216 following

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FastAPI Lifespan vs on_event: A Practical Decision Guide

Compare FastAPI's lifespan context manager with legacy on_event hooks. Learn how to safely initialize DB pools and shared resources using app.state for better testability and ASGI compliance.

fastapi lifespanTasadduq Burneyowner24K rep · 31 May 2026, 11:25 UTC