According to their own statement, Cloudflare perceived the "problem" to be the
code-complexity of their DNS implementation -- in particular, they
characterized the complexity of their (former) QTYPE=*-handling code as
"enormous". Their "fix" was to feign ignorance (RCODE=NOTIMP) of QTYPE=* and
Regarding the statement "query type ANY 'matches all RR types CURRENTLY IN THE
CACHE'."
Actually, there's nothing in RFC 1034 that clearly *mandates* this behavior --
Section 3.7.1 says only that a QTYPE of * "matches all RR types", whereas
Section 5.3.3 ("Algorithm") says to return "the answer
My 2 cents...
It is commonplace, these days, to clearly enumerate "MANDATORY TO IMPLEMENT"
elements of a protocol specification. But, this was not the typical practice at
the time RFCs 1034/1035 was written, and I don't think we can apply modern
standards-parlance retroactively. RFC 1034/1035 c
