Google App Engine and Channel Api with Gwt

Sometimes you need to show updates straight forward. In this case you have two options: polling and pushing. Polling require you to call the server with a refresh period. Polling can be expensive especially if you need a small refresh period. To resolve this you can use pushing. In this case is the server that inform the user of a change. With website the push is implemented by keeping a channel open between client and server.

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