Field notes — what I broke, and what the output actually said.

curl exit 0, 6, 7 and 28 — and why the same wrong port gives opposite symptoms

Four requests, one working app, four different exit codes, and no logs read. The interesting pair is 7 and 28: the identical mistake — a port nothing listens on — produces an instant TCP reset against a Pod IP and six seconds of silence against a ClusterIP, because only one of those addresses is a real machine.