Open Stack

hello everyone,
i'm wondering if there is any rest api for componnets' version info.

i read the http://api.openstack.org/api-ref.html and find:
1) keystone truly have a rest api for version info:
# curl http://127.0.0.1:5000/v2.0/
{"version": {"status": "beta", "updated": "2011-11-19T00:00:00Z",...
2) nova says it has, but sadly it does not work for essex
# curl -H "X-Auth-Token:token-for-admin-tenant" http://127.0.0.1:8774/v2
Authentication required
# curl -H "X-Auth-Token:token-for-admin-tenant" http://127.0.0.1:8774/v2.0/
{"choices": [{"status": "CURRENT",
so the document may point to folsom, and essex has little difference.

there seems no rest api for glance and horizon, and no CLI for nova
and horizon while CLI has glance --version and nova-manage version

so my question is:
1) is there any rest api for query components' version info in essex
and folsom (beside keystone)?
2) if not, will it be implemented in future?

thanks for any help.