Open up your browser interactive terminal at http://127.0.0 . Expand the POST /generate-pdf/ endpoint block. Click on the button. Modify the example JSON values with your custom details. Click "Execute" .

mkdir fastapi-app cd fastapi-app python -m venv venv source venv/bin/activate # On Windows: venv\Scripts\activate pip install fastapi uvicorn Use code with caution. 2. Your First FastAPI Application Create a file named main.py and add the following code:

You'll also need to install an ASGI server like uvicorn:

from fastapi import Header, HTTPException async def verify_token(x_token: str = Header(...)): if x_token != "super-secret-token": raise HTTPException(status_code=400, detail="X-Token header invalid") return x_token @app.get("/protected-data/", dependencies=[Depends(verify_token)]) def get_protected_data(): return "data": "This is highly secured information." Use code with caution. 8. Authentication and Security (JWT)

. ├── database.py ├── models.py ├── schemas.py ├── crud.py └── main.py

: Reduces human-induced errors by approximately 40%.

from fastapi import Depends, HTTPException from sqlalchemy.orm import Session from .database import engine, Base, get_db from .models import DBProduct Base.metadata.create_all(bind=engine) @app.post("/products/") def add_product(name: str, price: float, db: Session = Depends(get_db)): product = DBProduct(name=name, price=price) db.add(product) db.commit() db.refresh(product) return product Use code with caution. 7. Dependency Injection System

FROM python:3.10-slim WORKDIR /code COPY ./requirements.txt /code/requirements.txt RUN pip install --no-cache-dir --upgrade -r /code/requirements.txt COPY ./app /code/app CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "80"] Use code with caution. Build and Run the Container

import os DATABASE_URL = os.getenv("DATABASE_URL", "sqlite:///./default.db")

from pydantic import BaseModel