Gather proxies from the providers without checking.

        :param list countries: (optional) List of ISO country codes
                               where should be located proxies
        :param int limit: (optional) The maximum number of proxies

        :ref:`Example of usage <proxybroker-examples-grab>`.

async def grab(self, *, countries=None, limit=0):
        """Gather proxies from the providers without checking.

        :param list countries: (optional) List of ISO country codes
                               where should be located proxies
        :param int limit: (optional) The maximum number of proxies

        :ref:`Example of usage <proxybroker-examples-grab>`.
        """
        self._countries = countries
        self._limit = limit
        task = asyncio.ensure_future(self._grab(check=False))
        self._all_tasks.append(task)