code: def text_response(self, contents, code=200, headers={}):
          
          return Response(contents, status=code, headers={
              'Content-Type': 'text/plain'
          })
docs: shortcut to return simple plain/text messages in the response.
  
          :param contents: a string with the response contents
          :param code: the http status code
          :param headers: a dict with optional headers
          :returns: a :py:class:`flask.Response` with the ``text/plain`` **Content-Type** header.