Is long polling possible in Google App Engine?

Question

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

Answer 1

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:

client1 --Iframe Pattern--> Erlang/Mochiweb(HttpLongPolling):

Client2, sending a message:

client2 --XhrIo--> AppEngine --UrlFetch--> Erlang/Mochiweb

To use mochiweb with comet pattern, Richard Jones has written a good topic (on google: Richard Jones A Million-user Comet Application).