code: def doc
        unless body.empty?
          doc_class = if html?
                        Nokogiri::HTML::Document
                      elsif rss? || atom? || xml? || xsl?
                        Nokogiri::XML::Document
                      end
  
          if doc_class
            begin
              @doc ||= doc_class.parse(body, @url.to_s, content_charset)
            rescue
            end
          end
        end
      end
docs: Returns a parsed document object for HTML, XML, RSS and Atom pages.
  
   @return [Nokogiri::HTML::Document, Nokogiri::XML::Document, nil]
     The document that represents HTML or XML pages.
     Returns `nil` if the page is neither HTML, XML, RSS, Atom or if
     the page could not be parsed properly.
  
   @see http://nokogiri.rubyforge.org/nokogiri/Nokogiri/XML/Document.html
   @see http://nokogiri.rubyforge.org/nokogiri/Nokogiri/HTML/Document.html