The mdns querier that you have yet to see
$ go run . query -t _http._tcp.local PTR
QUERY _http._tcp.local. PTR :: RESPONSE from 192.0.2.1 on eth0 in 250ms
Answer: _http._tcp.local. 3600 IN PTR myserver._http._tcp.local.
myserver._http._tcp.local. 120 IN SRV 0 0 80 myserver.local. [CF]
myserver._http._tcp.local. 3600 IN TXT "" [CF]
Additional: myserver.local. 120 IN A 192.0.2.1 [CF]
myserver.local. 120 IN AAAA 2001:db8::1 [CF]