Posts Tagged: asynccontextmanager

FastAPI 0.115 to 0.120: New Lifespan Events Replace on_startup and on_shutdown

FastAPI 0.115-0.120 migration: Replace deprecated @app.on_event('startup'/'shutdown') with lifespan=asynccontextmanager(app). DB pools, ML models, uvicorn reload safe. Code before/after, pytest verify. Targets 'fastapi lifespan migration', 'fastapi startup shutdown deprecated', 'fastapi 0.115 lifespan events'.

Mar 15, 2026