how to make a chat room on google app engine , has some demo ? and example? [closed]

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has any app engine already do this ?

thanks

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Partychat an example of an XMPP-based chatroom running on App Engine. And it's open-source.

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AppEngine only supports HTTP and limits the response time (which makes Comet a no-go).

The only (supported) way is XMPP, but it only supports BOSH protocol, which does not facilitate push from server to clients.

It seems that your only way would be polling.