module ActionDispatch::Http::URL

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