url_for

# File actionpack/lib/action_dispatch/routing/route_set.rb, line 651
      def url_for(options)
        options = default_url_options.merge(options || {})

        user, password = extract_authentication(options)
        recall  = options.delete(:_recall)

        original_script_name = options.delete(:original_script_name).presence
        script_name = options.delete(:script_name).presence || _generate_prefix(options)

        if script_name && original_script_name
          script_name = original_script_name + script_name
        end

        path_options = options.except(*RESERVED_OPTIONS)
        path_options = yield(path_options) if block_given?

        path, params = generate(path_options, recall || {})
        params.merge!(options[:params] || {})

        ActionDispatch::Http::URL.url_for(options.merge!({
          :path => path,
          :script_name => script_name,
          :params => params,
          :user => user,
          :password => password
        }))
      end