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From Jim Jagielski <>
Subject Re: ping for http in mod_proxy
Date Thu, 14 Feb 2008 13:01:34 GMT

On Feb 13, 2008, at 6:01 PM, Graham Leggett wrote:

> Jim Jagielski wrote:
>> Ideally, it would be nice if we had better insight on the
>> actual health of the backends than a simple "do they respond
>> to OPTIONS * and how long does it take", but that's pretty
>> much all we can do unless go full-on multicasting of info
>> ala mod_backhand... At least the balancer is setup to allow
>> for load balancing based on that, if the submodule/provider
>> actually existed :)
> Is there anything stopping us going the multicasting route, say by  
> adding a hook or hooks of some kind to proxy that keeps track of  
> known server states?

> A dedicated module could then have it's job as handling the  
> multicasting and letting the rest of the server know if a server is  
> on or off the air, in realtime.
> The proxy can then just say "which of these servers should I connect  
> to?", and the hook will return the suggested ones in the given order.

Well, we almost do that now... :)

> As a dedicated module, people who don't need it can turn it off or  
> not build it.

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