The third address
The phone failed because it asked itself. You put the LAN IP you already have into the phone, read the access log, and write a two-line runbook. You leave holding the same file at its third address.
Topics
Unit test
Quick check: can you say why localhost failed, put the LAN IP on the phone, and restart the server from a two-line runbook?
Project
Live on Your Network
Serve ~/projects/first-site/index.html, load it on a second device on your Wi-Fi, prove it with the server's access log, and write a two-line runbook you could follow again in six months. ---