Fix Cloudflare not caching (always REVALIDATED/EXPIRED) due to duplicate Cache-Control: no-cache on OpenLiteSpeed and Nginx Reverse Proxy

Detailed guide on how to diagnose and fix Cloudflare cache failure (always returning REVALIDATED or EXPIRED status) due to duplicate Cache-Control headers with no-cache from the origin server using an Nginx Reverse Proxy combined with OpenLiteSpeed model.

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