class method self.build_host_url

# File actionpack/lib/action_dispatch/http/url.rb, line 95
        def build_host_url(host, port, protocol, options, path)
          if match = host.match(HOST_REGEXP)
            protocol ||= match[1] unless protocol == false
            host       = match[2]
            port       = match[3] unless options.key? :port
          end

          protocol = normalize_protocol protocol
          host     = normalize_host(host, options)

          result = protocol.dup

          if options[:user] && options[:password]
            result << "#{Rack::Utils.escape(options[:user])}:#{Rack::Utils.escape(options[:password])}@"
          end

          result << host
          normalize_port(port, protocol) { |normalized_port|
            result << ":#{normalized_port}"
          }

          result.concat path
        end