In a specific setup (Specific Website) DNS server is getting request for specific record (www.example.com) thus it's confident that the request will be followed by series of others (x.example.com, y.example.com, z.example.com).
Is it possible to gain reduction in these other requests if their RRs are included in additional section of DNS response (preemptive responding)? I.e.
DNS QUERY www A ANSWERS www A IN 220.127.116.11 AUTHORITATIVE NAMESERVERS NS IN ns1 NS IN ns2 ADDITIONAL RECORDS x A IN 18.104.22.168 y A IN 22.214.171.124 z A IN 126.96.36.199
The intention is to use such pre-populated responses:
- to speed up overall interaction with domain DNS server is serving (primary objective).
- to reduce DNS server load (secondary objective).
Is there any DNS service provider that is expert in this type of optimizations? Or let me know about argumented write-up on the topic and why the above is not possible.