Integrating websockets with appengine applications

Today, I've been struggling with an experimental implementation for a pseudo server push on appengine application. So let me share it with you. The only problem with appengine is that we can not utilize comet like capabilities on it because of its 30 seconds request limit. In this article, I use external websockets server for a pseudo server push on appengine. Here is the diagram(Click for bigger

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松尾貴史さんによるGAEでChannelAPIとWebSocketsでpush実現する　の資料。