code: async def send_maps(self, map_list):
          
          params = {
              'VER': 8,  # channel protocol version
              'RID': 81188,  # request identifier
              'ctype': 'hangouts',  # client type
          }
          if self._gsessionid_param is not None:
              params['gsessionid'] = self._gsessionid_param
          if self._sid_param is not None:
              params['SID'] = self._sid_param
          data_dict = dict(count=len(map_list), ofs=0)
          for map_num, map_ in enumerate(map_list):
              for map_key, map_val in map_.items():
                  data_dict['req{}_{}'.format(map_num, map_key)] = map_val
          res = await self._session.fetch(
              'post', CHANNEL_URL, params=params, data=data_dict
          )
          return res
docs: Sends a request to the server containing maps (dicts).