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I have a question on service endpoints.
I've read that Horizon depends quite heavily on them, and a
misconfiguration there can really mess things up. My question is, does the
endpoint need to be compatible with Horizon?

For instance, as of Grizzly, Keystone will support /v2.0 and /v3
Nova will support /v1.1 and /v2
Glance will support /v1 and /v2
Quantum will support a /v2

Can I safely use the latest endpoints (For instance, Keystone /v3), or does
Horizon only support certain endpoint versions? Can I have multiple
endpoints and create a /v2.0 and /v3?
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