How can COMET/ Server Push be achieved on Google app engine?

I am new to both Stack overflow and Google app engine. in a Java Web application, how ddo I achieve COMET, are there limitations in terms of connection timeout or if that is not possible, can a websocket serv开发者_运维知识库er be implemented on appengine ?

If you need server-to-client push, you have to use Channel API for GAE.

It not a COMET or WebSockets, technically, but it's same. And, I guess, I'll be functioning as a web sockets, sometimes in future (maybe it's already working, but i don't know where to get a browser that supports this feature, right now. Can anyone correct me there?). Btw, for you it'll be still same Channel API