FastAPI / Intermediate: application integration and security

FastAPI β€” Intermediate: application integration and security

Connect async execution, isolated tests, OpenAPI, trusted identity, resource policy, and transaction boundaries.

6 lessons Β· No account required

What you will learn

  • Choose appropriate async and synchronous execution boundaries.
  • Verify public contracts and real authorization with controlled dependencies.
  • Keep persistence, commit, and cleanup ownership explicit.

  1. Async execution and blocking work

    Choose async and synchronous boundaries according to the called operation, and preserve event-loop responsiveness without claiming unlimited parallelism.

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  2. Testing and dependency isolation

    Verify public behavior with isolated apps, controlled dependencies, and the appropriate synchronous or asynchronous test client.

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  3. Routers, OpenAPI, and contract evolution

    Organize operations into explicit modules and verify generated schema as part of a stable public API rather than treating documentation as authorization.

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  4. Authentication and security schemes

    Separate credential extraction, verification, session or token policy, and a trusted principal before protected application work.

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  5. Resource authorization and tenant scope

    Apply a trusted actor to the actual resource and operation, with deny-by-default behavior and tests that exercise the real policy.

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  6. Database and unit-of-work boundaries

    Separate request validation, repository access, transactions, and resource cleanup so an HTTP response reflects a defined persistence outcome.

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