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Added to my comment, but basically S3 is not a CDN - it doesn't have PoPs/anycast.

They _do_ use anycast and PoPs for the DNS services though. So that's basically how they handle the routing for buckets - but relies entirely on having separate subdomains.

What you're saying is correct for Cloudfront though.

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With SDN the PoP would only need to receive the TCP request and proxy TCP acks.

Raw data could flow from a different PoP that's closer to DC.

Aka user->Closest PoP-> backhaul fiber -> dc->user

Presumably Amazon has PoPs for CloudFront; why couldn't S3 share the same infrastructure?

It means two hops not one. S3 gets can be cached but then you have a whole host off issues. Better to get to the origin.

They could do that, but they have absolutely no incentive to do so - all it would do is cost them more. S3 isn't a CDN and isn't designed to work like one.

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