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TIL: #Cloudflare doesn't support the Vary HTTP header, which means the origin server can't do any content negotiation, for example send WebP or AVIF for a JPEG request…
https://developers.cloudflare.com/cache/about/cache-control/#other
#Fastly supports it, just saying… 😅
I get a lot of 503 errors from #Fastly in Chrome or Edge, not in Firefox or Safari, for image requests on https://nicolas-hoizey.photo/ 😱
The requests go to #Netlify then #Cloudinary (here's how), I don't know exactly where Fastly is.
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