Resolve a user-entered address to its BCF service base URL WITHOUT
sending credentials, for callers holding a token or password: probing
with the secret itself would send it to a candidate not yet known to be a
BCF service. An unambiguous address resolves with no request at all.
Resolve a user-entered address to its BCF service base URL WITHOUT sending credentials, for callers holding a token or password: probing with the secret itself would send it to a candidate not yet known to be a BCF service. An unambiguous address resolves with no request at all.