How can I access my FastAPI backend from a different IP on the same network?

How to Access FastAPI Backend from a Different IP on the Same Network

Accessing a FastAPI backend from a different IP address within the same local network can be achieved by following the steps outlined below:

1. Setting the Host Flag to 0.0.0.0:

To ensure accessibility from other devices on the network, set the host flag to 0.0.0.0 when running the FastAPI server. This indicates that the server should bind to all available IP addresses on the machine.

2. Adjusting Firewall Settings:

If necessary, adjust firewall settings to allow external access to the specified port. You may have to create inbound firewall rules to permit inbound connections.

3. Configuring CORS:

Configure CORS (Cross-Origin Resource Sharing) to allow requests from different origins in order to enable cross-origin requests (e.g., requests from the frontend to the backend).

4. Making HTTP Requests in JavaScript:

Ensure that the JavaScript fetch requests made by the frontend to the backend are using the correct origin and URL. This means using the same domain name as the one displayed in the browser's address bar, along with the port number the backend is listening on.

Additional Considerations:

• If the frontend and backend are running on the same IP address and port, relative paths can be used in the JavaScript fetch requests.
• Otherwise, the backend's CORS configuration must include the origin of the frontend.

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