get_url (Raggle::Engine)

    # File raggle, line 5053
        def Engine::get_url(url, last_modified = nil)
          ret = [nil, nil]

          if url =~ /^(\w+?):/
            key = $1.downcase
            if $config['url_handlers'][key]
              ret = $config['url_handlers'][key].call(url, last_modified)
            else
              if $config['strict_url_handling']
                raise "Missing handler for URL \"#{url}\"."
              else
                key = $config['default_url_handler']
                ret = $config['url_handlers'][key].call(url, last_modified)
              end
            end
          else
            if $config['strict_url_handling']
              raise "Malformed URL: #{url}"
            else
              key = $config['default_url_handler']
              ret = $config['url_handlers'][key].call(url, last_modified)
            end
          end

          ret
        end