Glossary: CI/CD with GitHub Actions

Host addresses (127.0.0.1, 0.0.0.0)

Also written: 0.0.0.0, 127.0.0.1, localhost

`localhost` (127.0.0.1) means your own computer. `0.0.0.0` tells a server to accept connections from anywhere, which gunicorn needs inside a container.