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Learn how FastAPI caches dependencies per request, shares sub‑dependency instances, and lets you swap them in tests without touching production data.
Goal is to clarify request-scoped storage cleanup and state isolation guarantees for Fiber v3 applications running with Prefork enabled and custom middleware that references App-level state. The configuration transition from single-process to Prefork changes the process model and initialization semantics compared with the default single-process mode. Fiber v
fastapi
fiber