Network · IOS API REFERENCE

NWParameters.ExpiredDNSBehavior

enum · iOS 12.0+ · SDK 27.1

enum ExpiredDNSBehavior

Allow or prohibit the use of expired DNS answers during connection establishment. If allowed, a DNS answer that was previously returned may be re-used for new connections even after the answers are considered expired. A query for fresh answers will be sent in parallel, and the fresh answers will be used as alternate addresses in case the expired answers do not result in successful connections. By default, this value is .systemDefault, which allows the system to determine if it is appropriate to use expired answers.

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