code: def _add_cookies(self, request: Request):
          '''Add the cookie headers to the Request.'''
          self._cookie_jar.add_cookie_header(
              request, self._get_cookie_referrer_host()
          f _add_cookies(self, request: Request):
          '''Add the cookie headers to the Request.'''
          self._cookie_jar.add_cookie_header(
              request, self._get_cookie_referrer_host()
          )
docs: Add the cookie headers to the Request.