We don't support long polling. You'll want to star this issue here:

http://code.google.com/p/googleappengine/issues/detail?id=377

On Fri, Apr 9, 2010 at 6:50 AM, g3 insight <[email protected]> wrote:

> We are facing one problem when implementing reversed ajax call
> crossing users on GAE
>
> It is a game center, many client users join the game and play
> together.
> We supposed that there is a singleton Game Center instance, and all
> user is saved in user list within this Game Center instance.
> Then, if UserA did one request in game, and want to ask whether UserB
> accept it, then system(server side) will do one reverse ajax call to
> UserB to ask his response when processing UserA's request.
> Also, when there is any data update on user or game, we will also use
> reverse ajax call to push those new data to each client user in
> UserList which is saved in Game Center instance.
>
> Now, we understood the Game Center class will be initialized in
> different server (JVM), so Game Center is not singleton instance on
> GAE.
> Also we found that it is very difficult to do reverse ajax call
> crossing users on GAE, because we can not do reverse ajax call to
> client UserY who is on serverB, when system is processing request of
> UserX on serverA.
>
> Any idea for handling this type Reverse Ajax Solution (Comet) on GAE?
>
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-- 
Ikai Lan
Developer Programs Engineer, Google App Engine
http://googleappengine.blogspot.com | http://twitter.com/app_engine

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