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explore / Backend & APIs / mozg / FastAPI

FastAPI · Advanced

Answer questions from the FastAPI advanced guide: advanced dependency patterns, sub-applications and mounting, WebSockets, lifespan events, custom request and APIRoute classes, and the advanced security setups.

234 notes · updated 2026-08-09 · trained 87%

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https://mozg.sh/mcp --header "Authorization: Bearer …"
> use mozg/fastapi-advanced — …
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Ask it things like

answers 26/30 on its latest exam
How do I create a dependency that can be configured with parameters at declaration time?Advanced Dependencies & Parameterized Patterns✓
What is the purpose of the SecurityScopes class in advanced security patterns?Advanced Security✓
How do you verify scopes in token validation for advanced security setups?Advanced Security✓
What is the difference between returning a response_model versus a Response object directly?Custom Request & Response Classes✓
What happens when you return a Response object directly from a path operation?Custom Request & Response Classes✓
What is the recommended pattern for implementing lifespan events in modern FastAPI?Lifespan Events✓
What does app.dependency_overrides attribute do in testing?Testing & Advanced Patterns✓
What is the basic syntax for receiving and sending messages in a WebSocket endpoint?WebSockets✓

What it can answer

30 coverage checks
87%
Answers 26 of the exam's 30 questions
✓Custom Request & Response Classes5 / 5
✓WebSockets5 / 5
▲Advanced Security4 / 5
▲Lifespan Events4 / 5
▲Sub-applications & Mounting4 / 5
▲Advanced Dependencies & Parameterized Patterns3 / 4
✓Testing & Advanced Patterns1 / 1
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Attacks survived

re-run weekly · 2026-08-09
✓gate-battery12/12 known hostile payloads caught by the ingest gate
✓injection-corpusevery active note scanned — no steering language
✓secret-corpusevery active note scanned — no keys or credentials

heuristic scans against known attack classes — measured and dated, not a promise of unpoisonability

Inside

  • TestClient for WebSocket testing · testing
  • Mounting WSGI application example with Flask · sub-applications
  • Using WSGIMiddleware to mount WSGI applications · sub-applications
  • a2wsgi package requirement for WSGIMiddleware · sub-applications
  • Deprecated WSGIMiddleware import location · sub-applications
  • In-memory WebSocket broadcasting limitations · websockets
  • WebSocket installation requirement · websockets
  • WebSocket dependency injection · websockets
  • WebSocket API syntax in FastAPI · websockets
  • WebSocketDisconnect exception handling · websockets
  • Await for messages and send messages in WebSocket · websockets
  • WebSocketException vs HTTPException in WebSocket endpoints · websockets
  • Data from Request object bypasses validation and documentation · advanced-dependencies/middleware
  • Request can coexist with other path parameters · advanced-dependencies/middleware

Licence

CC BY-NC-SA 4.0

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