app = FastAPI()
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
python -m venv fastapi-env source fastapi-env/bin/activate # On Windows: fastapi-env\Scripts\activate pip install fastapi uvicorn fastapi tutorial pdf
To start building your first API, follow these essential steps: FastAPI – Python Web Framework - TutorialsPoint
For persistent data storage, FastAPI integrates smoothly with Object-Relational Mappers (ORMs) like SQLAlchemy. Below is a structured implementation pattern for a database layer. 1. Database Configuration ( database.py ) app = FastAPI() from fastapi import Header async
Let's create a few more endpoints to demonstrate FastAPI's capabilities. Update the main.py file with the following code:
app = FastAPI()
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. Dependency Injection in Routes ( main.py )
Open your browser and navigate to http://127.0.0.1:8000 . You will see the JSON response: "message": "Welcome to the FastAPI Tutorial" . Accessing Interactive Documentation Accessing Interactive Documentation