# File lib/universal_ruby_whois/server.rb, line 196
    def raw_response!(domain)
      res = raw_response(domain)
      if !res || !res.respond_to?(:to_s) || res.blank?
        raise Whois::Server::Unavailable, "The WHOIS server for TLD #{tld.to_s} is currently unavailable. (response: #{unavailable_response})"
      end
      res
    end