Does Cloudflare do colo-to-colo cache serving?

Hi everyone.

Assuming I have a resource edge-cached in a Cloudflare colo (say A), will requests from other regions to other colos (say B) be served through some kind of private link from the hosting colo (A) to that colo (B) and to the client, or instead hit the origin?

By default it will hit the origin if the resource is not available in the current PoP.

What you were mentioning though is also possible as paid add-on

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