Security
python
Intermediate
CORS Middleware for FastAPI
Configure CORS in FastAPI with environment-driven allowed origins.
python
import os
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
app = FastAPI()
origins = os.getenv('ALLOWED_ORIGINS', 'http://localhost:3000').split(',')
app.add_middleware(
CORSMiddleware,
allow_origins=origins,
allow_credentials=True,
allow_methods=['*'],
allow_headers=['*'],
)Prerequisites
- fastapi
- python-dotenv
Pro Tips
- → Never use allow_origins=['*'] with allow_credentials=True.
Commercial Licensing
Acquire a production access token or template license for enterprise deployment.
Module Info
- Language
- python
- Level
- Intermediate
- Read time
- 2 min
- Published
- Jan 2025
- License
- Commercial License
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