PhilippTheServer

fastapi

Building HTTP APIs with FastAPI and Pydantic.

  1. Enforcing Client Identity Alongside Realm Roles

    Keycloak azp claim: a realm role does not show which client the token was issued to. Enforcing azp next to role checks in a FastAPI dependency.

    identity security fastapi

  2. An OpenAI-Compatible Proxy in Front of a Local Model Server

    /v1/chat/completions behind a FastAPI proxy: bearer API-key auth, unbuffered SSE streaming, and a /healthz that cannot trigger a model load.

    llm fastapi api-design identity

  3. One Dashboard on Five Unrelated Backends: Normalising at the Boundary

    asyncio.gather with return_exceptions=True in a FastAPI BFF: map two upstream APIs onto one schema and return partial data with health when one is down.

    fastapi architecture api-design frontend

  4. Closed-Vocabulary Pydantic Validation for a Public Ingest Endpoint

    Pydantic extra="forbid" and Literal types return 422 for typo'd fields and unknown values that the default extra="ignore" silently drops.

    fastapi api-design

  5. An Exception Hierarchy and One Handler for FastAPI Error Responses

    FastAPI add_exception_handler on a base AppError instead of raising HTTPException in services: one status-code mapping and a consistent error body.

    fastapi python api-design

  6. Designing a Consistent FastAPI Response Envelope

    FastAPI response envelope with Pydantic Generic[T] and a custom APIRoute get_route_handler that wraps every response in success, data and error.

    fastapi api-design python

  7. A Feature-Module Layout for a FastAPI Application That Keeps Growing

    FastAPI APIRouter per feature directory with its own router.py, schemas.py and service.py, replacing a shared routers.py, schemas.py and crud.py.

    fastapi python architecture

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