class method self.normalize_host

# File actionpack/lib/action_dispatch/http/url.rb, line 152
          def normalize_host(_host, options)
            return _host unless named_host?(_host)

            tld_length = options[:tld_length] || @@tld_length
            subdomain  = options.fetch :subdomain, true
            domain     = options[:domain]

            host = +""
            if subdomain == true
              return _host if domain.nil?

              host << extract_subdomains_from(_host, tld_length).join(".")
            elsif subdomain
              host << subdomain.to_param
            end
            host << "." unless host.empty?
            host << (domain || extract_domain_from(_host, tld_length))
            host
          end