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explore / Backend & APIs / mozg / FastAPI

FastAPI · Reference

Answer questions about the FastAPI reference exactly as specified: the FastAPI class and its parameters, APIRouter, Request and Response classes, status codes and exceptions, and every parameter class with its arguments.

197 notes · updated 2026-08-12 · trained 80%

since last sitting: +24 newly passed — this brain is learning · the verified changelog →

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$ claude mcp add --transport http mozg \
https://mozg.sh/mcp --header "Authorization: Bearer …"
> use mozg/fastapi-reference — …
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Ask it things like

answers 24/30 on its latest exam
When should I use Security() instead of Depends() for dependency injection?Dependencies and Background Tasks✓
How do I specify which servers should appear in the OpenAPI documentation for a FastAPI application?FastAPI Class Core✓
What parameter do I use in FastAPI() to customize how operation IDs are generated for path operations?FastAPI Class Core✓
What parameter in a path operation decorator lets me define which HTTP status codes are possible responses?Path Operations and Decorators✓
What exception should I raise for HTTP errors, and where is it imported from?Status Codes and Exceptions✓
What methods does APIRouter have available?APIRouter✓
What parameter can I pass to APIRouter to use a custom route class instead of the default?APIRouter✓
What is the scope parameter in yield dependencies used for?Dependencies and Background Tasks✓

What it can answer

30 coverage checks
80%
Answers 24 of the exam's 30 questionsIt answers 24 questions, 24 more than last time, out of an exam that grew by 30.Nothing it used to answer has stopped working.
▲Path Operations and Decorators6 / 7
✓Status Codes and Exceptions4 / 4
✓Dependencies and Background Tasks3 / 3
▲FastAPI Class Core3 / 4
▲Request and Response Classes3 / 4
✓APIRouter2 / 2
✓Testing2 / 2
▲Parameter Classes1 / 4
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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

  • Query, Path, and Cookie are functions returning special classes · parameter classes
  • Cookie parameters work like Query and Path parameters · parameter classes
  • Browser cookies limitation in API documentation UI · parameter classes
  • Cookie parameter declaration syntax · parameter classes
  • Cookie must be imported explicitly · parameter classes
  • Cookie is a Param subclass · parameter classes
  • Extra forbidden cookie error response format · status codes and exceptions
  • Cookie parameter models with Pydantic · parameter classes
  • Cookie parameter models apply to Query, Header too · parameter classes
  • Forbid extra cookies with Pydantic model configuration · parameter classes
  • Custom Request class to override Request.body() · request & response classes
  • Accessing request body in exception handlers · request and response classes
  • Use cases for custom Request and APIRoute classes · path operations & decorators
  • Request object attributes: scope and receive · request and response classes

Licence

CC BY-NC-SA 4.0

Use it, copy it, build on it, with credit. Selling it is not allowed.