748a548e1b4fbecc7d7de12a6c0e87979810ac46
From RFC 6762, Section 10.2 "They (the rules about when to set the cache-flush bit) apply to startup announcements as described in Section 8.3, "Announcing", and to responses generated as a result of receiving query messages." So, set the cache-flush bit for mDNS answers except for DNS-SD service enumerattion PTRs described in RFC 6763, Section 4.1.
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