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| Cache MISS | Visitor → edge → origin | No | High, first request only | HTTP, backbone to origin | Medium | First visitor of each URL |
| Edge HIT | Edge POP → visitor | No, a stored copy | Very low | HTTP at the POP | Low | Hot assets on repeat views |
| Purge + TTL | Origin → every edge POP | Near real-time | Seconds, until propagated | Purge API or TTL expiry | Medium | Fresh content after deploys |