}
			}
		} else if s == "192.0.2.1:53" {
			if q.Questions[0].Type == dnsmessage.TypeA && strings.HasPrefix(q.Questions[0].Name.String(), "empty.com.") {
				var edns0Hdr dnsmessage.ResourceHeader
				edns0Hdr.SetEDNS0(maxDNSPacketSize, dnsmessage.RCodeSuccess, false)

				r.Additionals = []dnsmessage.Resource{
					{
						Header: edns0Hdr,
						Body:   &dnsmessage.OPTResource{},
					},
				}
			}
		}

const (
	edns0Version = 0

	edns0DNSSECOK     = 0x00008000
	ednsVersionMask   = 0x00ff0000
	edns0DNSSECOKMask = 0x00ff8000
)

// SetEDNS0 configures h for EDNS(0).
//
// The provided extRCode must be an extended RCode.
func (h *ResourceHeader) SetEDNS0(udpPayloadLen int, extRCode RCode, dnssecOK bool) error {
	h.Name = Name{Data: [255]byte{'.'}, Length: 1} // RFC 6891 section 6.1.2
	h.Type = TypeOPT