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#startup-shutdown

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FastAPI Lifespan vs Legacy Events: Choosing the Right Startup Pattern for Shared Resources

Choose FastAPI's lifespan context manager over legacy on_event handlers for reliable startup/shutdown of database pools, caches, and telemetry. This guide compares mechanisms, shows a production-ready pattern with nested async context managers, and provides validation steps.

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fastapi startup-shutdownTasadduq Burneyowner28.8K rep · 12 Mar 2026, 08:25 UTC

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Managing App-Lifetime Resources in FastAPI with Lifespan Context Managers

Use FastAPI lifespan context managers to initialize app-scoped resources once at startup and guarantee cleanup on shutdown, exposing them via dependency injection without globals.

fastapi startup-shutdown dependency-injectionTasadduq Burneyowner28.8K rep · 30 Nov 2025, 07:08 UTC