- Bare IP addresses and non-domain hosts (localhost, IPv6) now return a
null expiry instead of throwing, so they no longer spam error logs.
- Extract the registrable domain with tldts instead of walking up
hostname labels, so a subdomain can never accidentally return its
parent domain's expiry date.
- Cache WHOIS lookups per registrable domain (1h positive, 10min
negative) so visiting details pages does not re-query the registry
every time.
Addresses review feedback on #3834.
colinjtsen2010
75516a220d