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Cloudflare does not consider vary values in caching decisions
Here's the spot in Cloudflare's documentation where they hide a crucially important detail:
"Cloudflare does not consider vary values in caching decisions. Nevertheless, vary values are respected when Vary for images is configured and when the vary header is vary: accept-encoding."
This means you can't deploy an application that uses content negotiation via the Accept header behind the Cloudflare CDN - for example serving JSON or HTML for the same URL …