cache_page

# File actionpack/lib/action_controller/caching/pages.rb, line 138
      def cache_page(content = nil, options = nil)
        return unless self.class.perform_caching && caching_allowed?

        path = case options
          when Hash
            url_for(options.merge(:only_path => true, :format => params[:format]))
          when String
            options
          else
            request.path
        end

        if (type = Mime::LOOKUP[self.content_type]) && (type_symbol = type.symbol).present?
          extension = ".#{type_symbol}"
        end

        self.class.cache_page(content || response.body, path, extension)
      end