oschaaf commented on issue #1655: Clarification about downstream caching 
documentation
URL: 
https://github.com/apache/incubator-pagespeed-ngx/issues/1655#issuecomment-501837078
 
 
   I think the cache-control is overridden to make sure no-one downstream 
caches it.
   
   Varnish will cache it though, and reply with cached html responses most of 
the time. (A small sample set of traffic will be forced cache-miss randomly, 
which allows pagespeed to resynthesize the response every now and then and send 
intrumentation beacons to the browsers).

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