For nslookup command, it has nslookup somewhere.com some.dns.server.
However, it seems that golang dnsclient only load config from /etc/resolv.conf
code here: https://golang.org/src/net/dnsclient_unix.go#L225
Does the golang standard library provide something like
func LookupTXT(name string, dnsServer string) (txt []string, err error) ?
requirement:
1. Don't change the default /etc/resolv.conf.
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