How Can I Make My Flask Development Server Accessible from Other Computers on the Network?

Making Flask Dev Server Accessible across the Network

When running a Flask app in development mode, it's often not accessible from machines other than the local computer on which it's running. This behavior, unlike that of Rails in dev mode, can be puzzling.

Reason for Limited Accessibility

The Flask development server is not intended for production and is designed with a focus on convenience and ease of use rather than security and stability. For production deployment, the Flask documentation recommends using alternatives like gunicorn.

Solution: Configuring for Network Visibility

Despite the limitations, it is possible to enable network visibility for the Flask dev server with the following configuration:

1. --host Option: Use the --host option when running the server command, e.g., flask run --host=0.0.0.0.
2. host Parameter: Alternatively, set the host parameter when calling app.run(), e.g., app.run(host="0.0.0.0").

0.0.0.0 is a special IP address that binds the server to all IP addresses of the host machine. This allows access from other machines on the network using the machine's actual IP address.

Firewall and Security Considerations

After enabling network visibility, ensure that your firewall allows incoming connections on the designated port (5000 by default). Additionally, be mindful of potential security concerns associated with running the Flask dev server in a production environment.

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