# File lib/cool.io/dns_resolver.rb, line 146
    def request_message
      # Standard query header
      message = [2, 1, 0].pack('nCC')

      # One entry
      qdcount = 1

      # No answer, authority, or additional records
      ancount = nscount = arcount = 0

      message << [qdcount, ancount, nscount, arcount].pack('nnnn')
      message << @question
    end