Ben Lubar c3d1594576 Reduce server load caused by anonymous viewing. (#9059)
Do not start a session if the current user is not logged in for public-facing pages.

Mark pages that don't care about sessions as publicly cacheable.

Keep the max age as 0 so proxies and browsers will still try to retrieve an updated version but can still fall back to the stale version if the site is down or too slow.

Fixes #9035.
2019-03-17 15:39:25 +01:00
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