How to Access a FastAPI Backend from a Different Machine on the Same Local Network?

Accessing FastAPI Backend from a Different Machine on the Same Local Network

Solution:

To access a FastAPI backend from a different machine or IP address on the same local network, it's essential to ensure the following:

1. Set the Host Flag to 0.0.0.0

By setting the host of the FastAPI application to 0.0.0.0, the server will listen on all IPv4 addresses on the local machine. This allows it to be reachable from any machine on the network.

2. Adjust Firewall Settings

Depending on your operating system, you may need to adjust firewall settings to allow external access to the specified port for the FastAPI server.

3. Configure CORS

If the frontend is listening on a different IP address or port than the backend, proper CORS configuration is crucial. Ensure that the frontend's origin is included in the CORS settings of the backend to allow cross-origin requests.

4. JavaScript Fetch Requests

When making fetch requests from the frontend, use the same origin (e.g., IP address and port) that you type in the browser's address bar. For example:

fetch('http://192.168.178.23:8000/people', {...});

Additional Considerations:

• If both frontend and backend are running on the same machine on the same port, you can use relative paths for convenience.
• If you're accessing the frontend or backend using localhost or 127.0.0.1 on the same machine, they are considered different origins and require CORS configuration.
• Include the frontend origin in the CORS settings of the backend whenever the frontend origin differs from the backend origin.

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