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It seems convenient to do this in CTile rather than Nginx because (currently) it's easier for us to scale the number of CTile instances than the number of Nginx instances.
Using NYTimes/gziphandler simplifies a little bit the handling of different cases (like whether or not the requester accepts gzip encoding).
I incorporated the gzip handler into
tileCachingHandler
rather than setting it up in main, in order to make it easier to test inside the current integration test.