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I need to make application that needs to poll server often, but GAE has limitations on requests, so making a lot of requests could be very costly. Is it possible to use long polling and make requests wait for the maxium 30 seconds for changes?
Google AppEngine has a new feature Channel API, with that you have
a possibility to build a good realtime application.
Another solution is to use a third part comet server like mochiweb
or twisted with a iframe pattern.
Client1, waiting a event:
Client2, sending a message:
To use mochiweb with comet pattern, Richard Jones has written a good
topic (on google: Richard Jones A Million-user Comet Application).