dnsdist: Handle header-only responses, handle Refused as Servfail in the cache #4812
@rygl reported that
The check is done before inserting the response into the cache, but it feels safer to check it again before passing it to `memcpy()`. We check that the cached response is larger than `sizeof(dnsheader) + qname` afterwards, but the previous commit moved the header copy before that check.
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