Google Maps Onebox data is not cached

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I’m with @codinghorror: this isn’t a bug.

Consider the difference in response headers from the two requests:

$ wget -O /dev/null -S https://xkcd.com/123 |& grep Cache-Control
  Cache-Control: max-age=300
  Cache-Control: max-age=300
$ wget -O /dev/null -S https://goo.gl/maps/R6nj3Qwf2LR2 |& grep Cache-Control
  Cache-Control: no-cache, no-store, max-age=0, must-revalidate
  Cache-Control: private
  Cache-Control: no-cache, must-revalidate

(There are multiple headers because of redirects being followed)

It would be a bug if the onebox library cached data when the origin said not to. The other way around… not so much.

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