D2 — CDN edge architecture
Edge / regional / origin caching tiers.
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user -> edge: request
edge -> regional: miss
regional -> origin: miss
origin -> regional: response
regional -> edge: cache
edge -> user: responseEdge / regional / origin caching tiers.
user -> edge: request
edge -> regional: miss
regional -> origin: miss
origin -> regional: response
regional -> edge: cache
edge -> user: response