DNS names are case-insensitive (RFC 4343), but the catalog-zone
dispatch compared dname verbatim:
if dname == "catz" or dname == f"{nb_view.name}.catz":
dname is derived from qname.to_text(), which preserves the casing the
client sent. A query for CATZ, Public.catz, or any other mixed-case
variant failed the comparison and fell through to _get_zone_from_nb,
which returned None, so the request was denied instead of being served
as a catalog zone.
Lowercase both sides before comparing. Pass the lowercased name to
create_zone so catalog zones always get a canonical lowercase origin,
and pass the original dname to _get_zone_from_nb to leave the regular
zone-lookup behavior unchanged.
Sven Luethi
25c1ab4e12