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While I was laying the groundwork for a new datastore client library with support for asynchronous requests, I added some low-level support for asynchronous RPCs that you can use today. The only App Engine API with documented support for asynchronous RPCs is urlfetch, and it happens to be quite useful with that.Suppose you want to fetch some data from a remote service. The remote service has two instances, both of which are slightly flaky. What you want to do is send off requests to both servers...