How to Set Geographic DNS Routing Limits with Go TTL Caching
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Use DNS only for a coarse regional assignment that can remain stale without breaking onboarding; put a fast cutover in the application or edge layer, where you can observe and reverse it directly. Short answer: no TTL turns DNS into a sub-minute failover system, because resolvers honor TTL loosely and cached answers can survive longer than the value suggests. For a fintech flow that must prove domain ownership before onboarding completes, that distinction is operational, not academic. A custome