Then please remove it from rootDSE. It does not make sense at all to be advertised in 'supportedControl'.
It's hidden, in fact. You're not supposed to treat HEAD as released code, and you won't see it advertised in re24 (until it works, at least).
In any case, there's nothing wrong in advertising support for a control and returning unwillingToPerform or unavailableCriticalExtension: in both cases it's correct. It means that the DSA recognizes the control but either does not want, or cannot apply it in the case requested by the client. It's LDAPv3 anyway.
p.
Ing. Pierangelo Masarati OpenLDAP Core Team
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