code: def check_content(self):
          
          if self.do_check_content and self.valid:
              # check content and recursion
              try:
                  if self.can_get_content():
                      self.aggregate.plugin_manager.run_content_plugins(self)
                  if self.allows_recursion():
                      return True
              except tuple(ExcList):
                  value = self.handle_exception()
                  self.add_warning(_("could not get content: %(msg)s") %
                       {"msg": str(value)}, tag=WARN_URL_ERROR_GETTING_CONTENT)
          return False
docs: Check content of URL.
          @return: True if content can be parsed, else False