func appendAddress(request []byte, address v2net.Address) []byte { switch { case address.IsIPv4(): request = append(request, byte(0x01)) request = append(request, address.IP()...) case address.IsIPv6(): request = append(request, byte(0x04)) request = append(request, address.IP()...) case address.IsDomain(): request = append(request, byte(0x03), byte(len(address.Domain()))) request = append(request, []byte(address.Domain())...) } request = append(request, address.PortBytes()...) return request }