#!/usr/bin/env sh
set -eu
host="${1:-example.com}"
printf '== DNS ==
'
dig +short "$host" A
printf '
== HTTPS headers ==
'
curl --fail --show-error --location --max-time 10 --head "https://$host/"
printf '
== Timing ==
'
curl -o /dev/null -sS -w 'status=%{http_code} dns=%{time_namelookup} connect=%{time_connect} total=%{time_total}
' "https://$host/"