Host addresses (127.0.0.1, 0.0.0.0)
Also written: 127.0.0.1, 0.0.0.0, localhost
127.0.0.1 (localhost) is reachable only from the same computer; 0.0.0.0 means listen on every network interface. The Dockerfile starts uvicorn with --host 0.0.0.0 so the container is reachable from outside.