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Some DNS responses may be valid from a protocol point of view, but may not contain any information considered as interested by the requester.. Purpose of the flag DNS_RESP_NO_EXPECTED_RECORD introduced by this patch is to allow reporting such situation. When this happens, a new DNS query is sent with a new query type. For now, the function only expect A and AAAA query types which is enough to cover current cases. In a next future, it will be up to the caller to tell the function which query types are expected.