FastAPI

How FastAPI's ASGI foundation, Depends dependency graph, and Pydantic validation compose into a single request lifecycle, and why that composition - not any one feature alone - is the framework's real design.

First app, path/query params, and auto docs.

Pydantic models, validation, and serialization.

`Depends`, sub-dependencies, and reusable providers.

Async endpoints with SQLAlchemy/`asyncpg`.

CORS, exception handlers, and custom middleware.

`TestClient`, dependency overrides, and fixtures.

Structure, validation, and performance.