I encountered a weird issue. 1 of the .css and .woff file never cache in AMS data center and hit error 522 where the cache-control show private. However, if I load my site from other Cloudflare data center, eg SIN/LHN/CDG, the same file show HIT.
I purged all cache in the dashboard, but problem still there.
Status Code: 522
cache-control: private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0