Closest Cloud Provider to Google App Engine [closed]

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http://serverfault.com – I have an application that has to run on a Windows Server (2012) but I would like to access its REST API via Google App Engine. Which cloud provider (e.g. Amazon, Microsoft and Rackspace) would have a DC with the lowest latency and closest proximity to App Engine's US footprints? I know this is a bit hard to nail down as App Engine is distributed across multiple DCs, but I am wondering if anyone has experience in this area. (HowTos)