DNS_RECORD_TYPE_UNSUPPORTED
HTTP 400No
NEW code. record_type not in {A,AAAA,CNAME,TXT,MX}. param=record_type.
By default a failed call returns a result with an error instead of throwing, so your business flow is never interrupted.
Published error codes are permanent: their meaning never silently changes, and deprecated codes keep returning for at least 12 months.