from fastapi import Header async def verify_secret_token(x_auth_token: str = Header(...)): if x_auth_token != "super-secret-system-key": raise HTTPException(status_code=400, detail="Invalid Security Token") return x_auth_token @app.get("/secure-data") def get_protected_resources(token: str = Depends(verify_secret_token)): return "secure_payload": "Top secret analytics data", "authenticated_via": token Use code with caution. Comprehensive Error Handling
FastAPI automatically generates documentation for your endpoints. You can access them at: : http://127.0.0 ReDoc : http://127.0.0 Handling Path and Query Parameters
class Item(ItemBase): id: int class Config: orm_mode = True # allows reading from ORM objects
@app.get("/users/") def read_users(db: Session = Depends(get_db)): return db.query(User).all() fastapi tutorial pdf
from sqlalchemy import Column, Integer, String from .database import Base class DBUser(Base): __tablename__ = "users" id = Column(Integer, primary_key=True, index=True) username = Column(String, unique=True, index=True) email = Column(String, unique=True, index=True) Use code with caution. 3. Integrating with Endpoints
Next, install FastAPI along with , an ASGI server used to run your application. pip install fastapi uvicorn[standard] Use code with caution. 2. Your First FastAPI Application
@app.get( Use code with caution. Copied to clipboard uvicorn main:app --reload to start a development server with live-reloading. 2. Path and Query Parameters : Type completions work everywhere
Mastering FastAPI: The Ultimate Guide to Building High-Performance APIs
There is a lack of a definitive "textbook" style PDF for FastAPI. Most resources are either reference docs or very short blog posts.
: Type completions work everywhere, reducing debugging time. press Ctrl+P (or Cmd+P )
The official FastAPI documentation allows you to print individual pages or the entire navigation tree. Simply go to any page, press Ctrl+P (or Cmd+P ), and select "Save as PDF." For the full tutorial, start from the "First Steps" page and repeat.
# GET endpoint to retrieve all items @app.get("/items/") def read_items(): return items
: Covers CRUD operations, dependency injection, and file uploads. Official & Interactive Resources
from fastapi import Query, Path
@app.get("/users/me/") def read_users_me(current_user: User = Depends(get_current_user)): return current_user