CORS Configuration

To facilitate secure and seamless communication between the React frontend and the FastAPI backend, I implemented Cross-Origin Resource Sharing (CORS) middleware which is provided by FastAPI. This middleware allows controlled cross-origin requests, which are essential for enabling the frontend—served from different origins (e.g., local development servers at http://localhost:5173 and http://127.0.0.1:5173, or the production URL set via the environment variable FRONTEND_URL)—to communicate with the backend without security conflicts. Allowed origins are loaded from environment variables, ensuring flexibility across both development and deployment environments.

And we’re done with the backend!