[question] interoperability with non-compliant authoritative servers which return FORMERR with OPT RR in answers
Chrome: DNS_PROBE_FINISHED_NXDOMAIN
iratest-dns:~/install/bind-9.19.4# dig @8.8.8.8 store.cranfield.ac.uk. a
; <<>> DiG 9.19.4 <<>> **@8.8.8.8** store.cranfield.ac.uk. a
[...]
;; ANSWER SECTION:
store.cranfield.ac.uk. 21587 IN CNAME cra0017-01.store.edu.wpmhost.net.
**cra0017-01.store.edu.wpmhost.net. 287 IN CNAME xbar4ndr.wpm.flywire.com.
xbar4ndr.wpm.flywire.com. 300 IN A 104.18.190.90
xbar4ndr.wpm.flywire.com. 300 IN A 104.17.66.74**
AND NOT:
; <<>> DiG 9.19.4 <<>> @localhost store.cranfield.ac.uk. A
[...]
;; ->>HEADER<<- opcode: QUERY, status: **SERVFAIL**, id: 24593
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1