How Can I Make My Flask Development Server Accessible from Other Networks?

Make Flask Development Server Accessible from the Network

The Flask development server is intended for local use and does not facilitate access from other network devices by default. While it's possible to enable this, it's not recommended for production environments due to security and performance limitations.

Host Configuration

To make the development server accessible across the network, set the --host option in the following manner:

flask run --host=0.0.0.0

This configuration instructs the server to listen on all available IP addresses associated with your machine. Note that it's necessary to access the server using the actual IP address, as 0.0.0.0 is not resolvable in browsers.

Firewall Considerations

After enabling external access, it may be necessary to adjust your firewall settings to allow incoming connections on the specific port (default: 5000). Check your firewall configuration to ensure access is granted from the intended source.

Documentation Reference

The Flask quickstart documentation explains this configuration in the "Externally Visible Server" section:

If you run the server you will notice that the server is only
accessible from your own computer, not from any other in the network.
This is the default because in debugging mode a user of the
application can execute arbitrary Python code on your computer.

If you have the debugger disabled or trust the users on your network,
you can make the server publicly available simply by adding
--host=0.0.0.0 to the command line:

$ flask run --host=0.0.0.0

This tells your operating system to listen on all public IPs.

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