I definitely, absolutely love the idea of having appengine internally route 
foo.com/api to api.foo.appspot.com.  An under-the-covers targeting of 
different apps/versions is the only way I can think of to get ssl for the 
whole app without having to deal with how browsers handle the 
 *.appspot.com certificate.  Plus, being able to configure different 
instance configs with high or low latency would take advantage of smart 
clients that actually know which requests _should_ take a certain amount of 
time {before pre-warming requests, I had every gwt rpc log it's average run 
time in a format I compiled in to set a "you should be done by now" timer 
at 2x expected latency, so I could kill to old request and fire off a retry 
without waiting 10 seconds for the request to die}.

Anyway, the extra perks of shared memcache would be nice, but I would be 
more than absolutely happy to use it with nothing more than a single shared 
datastore namespace to serve as inter-app-swap space.  Being able to remote 
api data over _would_ work, but paying for http + instance hours when all 
we need is entity get() -> entity put() makes it far less than desirable.


I think, for standard users, they would have to pay flat billing for all 
app versions as if they were the same app.  Premium accounts already pay 
$500/month and can just hook up multiple apps however they please, and just 
pay for usage.

Please keep us updated, I'm very excited about the potential to wire up 
multiple apps, especially if I can send requests to sub-apps / sub-versions 
under a single ssl-friendly subdomain. =}

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