Martin Brennan 901054fd75
FIX: Cache failed onebox URL request server-side (#8421)
We already cache failed onebox URL requests client-side, we now want to cache this on the server-side for extra protection. failed onebox previews will be cached for 1 hour, and any more requests for that URL will fail with a 404 status. Forcing a rebake via the Rebake HTML action will delete the failed URL cache (like how the oneboxer preview cache is deleted).
2019-11-28 07:48:29 +10:00
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