How to get specific OSB business service HTTP endpoint failover?

I am trying to get the following behavior in an HTTP Business Service in OSB, and I'm not finding the answer (if it exists) in the docs.
I have two backend endpoints, "production" and "backup." I want all request to go to the "production" endpoint unless it becomes unavailable. At which time all requests should go to the backup endpoint - without manual intervention. Automatic failback would be nice but not absolutely necessary. This is what the service provider is recommending for their operational concerns.
Is there some way to accomplish this?
The backup is available at most times, so we can't use round-robin load balancing to get this behavior.
Is this what having a load balancing algorithm of "none" accomplishes? The docs state the order in this case is significant, but not why?
Random-weighted does not work, as it does not allow a zero weight, which means some requests (even if small in proportion) may go to that backup even if the primary is available.

I'm now seeing this in real operation, and I'm seeing something that puzzles me based on the discussion above, and also a behavior I'd like to change if I can.....
First, the puzzlement - of about 6700 invocations over the space of a few hours, I see in the console 9 errors in the primary as configured above, and 9 messages handled successfully by the secondary. So, since the messages are coming on a fairly regular basis (a few per minute, spread over 3 OSB instances), and I have a 10 min retry interval, I would have expected to see a lot more messages handled by the secondary endpoint while OSB instance was waiting 10 min to retry the primary. What's going on here? Does this class of "failure" not take an endpoint "offline?"
Second, behavior I want to change: the errors are apparently intermittent SSL HANDSHAKE_FAILUREs reported by the backend. Is there anyway to get the primary retried first, since we only want traffic to go to the backup if the primary is really offline?
/Steve Elkind
####<Dec 22, 2009 10:45:14 PM EST> <Warning> <Security> <njxymh0099> <SS_ESB_mgd2> <[ACTIVE] ExecuteThread: '0' for queue: 'weblogic.kernel.Default (self-tuning)'> <<anonymous>> <> <> <1261539914730> <BEA-090497> <HANDSHAKE_FAILURE alert received from fobar-web02.inex.com - 207.235.231.231. Check both sides of the SSL configuration for mismatches in supported ciphers, supported protocol versions, trusted CAs, and hostname verification settings.>

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