host_or_subdomain_and_domain

# File actionpack/lib/action_dispatch/http/url.rb, line 66
        def host_or_subdomain_and_domain(options)
          return options[:host] unless options[:subdomain] || options[:domain]

          tld_length = options[:tld_length] || @@tld_length

          host = ""
          host << (options[:subdomain] || extract_subdomain(options[:host], tld_length))
          host << "."
          host << (options[:domain]    || extract_domain(options[:host], tld_length))
          host
        end