Requirements
- Target platform
- OpenClaw
- Install method
- Manual import
- Extraction
- Extract archive
- Prerequisites
- OpenClaw
- Primary doc
- SKILL.md
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FastAPI
Build fast, production-ready Python APIs with type hints, validation, and async support.
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Build fast, production-ready Python APIs with type hints, validation, and async support.
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Install for OpenClaw
Quick setup
- Download the package from Yavira.
- Extract the archive and review SKILL.md first.
- Import or place the package into your OpenClaw setup.
Package facts
- Download mode
- Yavira redirect
- Package format
- ZIP package
- Source platform
- Tencent SkillHub
- What's included
- SKILL.md
Validation
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- Review SKILL.md after the package is downloaded.
- Confirm the extracted package contains the expected setup assets.
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Trust & source
Release facts
- Source
- Tencent SkillHub
- Verification
- Indexed source record
- Version
- 1.0.0
Provenance
- Publisher
- ivangdavila
- Source page
- View original listing
- Canonical URL
- Open canonical page
Documentation
Async Traps
Mixing sync database drivers (psycopg2, PyMySQL) in async endpoints blocks the event loop โ use async drivers (asyncpg, aiomysql) or run sync code in run_in_executor time.sleep() in async endpoints blocks everything โ use await asyncio.sleep() instead CPU-bound work in async endpoints starves other requests โ offload to ProcessPoolExecutor or background workers Async endpoints calling sync functions that do I/O still block โ the entire call chain must be async
Pydantic Validation
Default values in models become shared mutable state: items: list = [] shares the same list across requests โ use Field(default_factory=list) Optional[str] doesn't make a field optional in the request โ add = None or use Field(default=None) Pydantic v2 uses model_validate() not parse_obj(), and model_dump() not .dict() โ v1 methods are deprecated Use Annotated[str, Field(min_length=1)] for reusable validated types instead of repeating constraints
Dependency Injection
Dependencies run on every request by default โ use lru_cache on expensive dependencies or cache in app.state for singletons Depends() without an argument reuses the type hint as the dependency โ clean but can confuse readers Nested dependencies form a DAG โ if A depends on B and C, and both B and C depend on D, D runs once (cached per-request) yield dependencies for cleanup (DB sessions, file handles) โ code after yield runs even if the endpoint raises
Lifespan and Startup
@app.on_event("startup") is deprecated โ use lifespan async context manager Store shared resources (DB pool, HTTP client) in app.state during lifespan, not as global variables Lifespan runs once per worker process โ with 4 Uvicorn workers you get 4 DB pools from contextlib import asynccontextmanager @asynccontextmanager async def lifespan(app): app.state.db = await create_pool() yield await app.state.db.close() app = FastAPI(lifespan=lifespan)
Request/Response
Return dict from endpoints, not Pydantic models directly โ FastAPI handles serialization and it's faster Use status_code=201 on POST endpoints returning created resources โ 200 is the default but semantically wrong Response with media_type="text/plain" for non-JSON responses โ returning a string still gets JSON-encoded otherwise Set response_model_exclude_unset=True to omit None fields from response โ cleaner API output
Error Handling
raise HTTPException(status_code=404) โ don't return Response objects for errors, it bypasses middleware Custom exception handlers with @app.exception_handler(CustomError) โ but remember they don't catch HTTPException Use detail= for user-facing messages, log the actual error separately โ don't leak stack traces
Background Tasks
BackgroundTasks runs after the response is sent but still in the same process โ not suitable for long-running jobs Tasks execute sequentially in order added โ don't assume parallelism If a background task fails, the client never knows โ add your own error handling and alerting
Security
OAuth2PasswordBearer is for documentation only โ it doesn't validate tokens, you must implement that in the dependency CORS middleware must come after exception handlers in middleware order โ or errors won't have CORS headers Depends(get_current_user) in path operation, not in router โ dependencies on routers affect all routes including health checks
Testing
TestClient runs sync even for async endpoints โ use httpx.AsyncClient with ASGITransport for true async testing Override dependencies with app.dependency_overrides[get_db] = mock_db โ cleaner than monkeypatching TestClient context manager ensures lifespan runs โ without with TestClient(app) as client: startup/shutdown hooks don't fire
Category context
Code helpers, APIs, CLIs, browser automation, testing, and developer operations.
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Package contents
Included in package
1 Docs
- SKILL.md