The check expects 405 for any HTTP method not declared on a path.
DECNET's topology router has a static `/topologies/services` (GET only)
sibling to a parameterized `/topologies/{topology_id}` (DELETE), so a
DELETE on the static path falls through to the parameterized route and
hits auth, which returns 401 — by design. Leaking 405-vs-401 would let
unauthenticated callers enumerate valid topology UUIDs.
The same shape applies to other static/dynamic sibling pairs across
the API. The check is fundamentally incompatible with that routing
strategy; document the omission inline.