code: async def execute_method(self, method, **params):
          
          url = self.url_builder(method, url_params=params)
          logger.info('Executing method %r', method)
          response = await aiohttp.get(url)
          logger.info('Status: %r', response.status)
          if response.status == 200:
              json = await response.json()
              logger.debug('...with JSON %r', json)
              if json.get('ok'):
                  return json
              raise SlackApiError(json['error'])
          else:
              raise_for_status(response)
docs: Execute a specified Slack Web API method.
  
          Arguments:
            method (:py:class:`str`): The name of the method.
            **params (:py:class:`dict`): Any additional parameters
              required.
  
          Returns:
            :py:class:`dict`: The JSON data from the response.
  
          Raises:
            :py:class:`aiohttp.web_exceptions.HTTPException`: If the HTTP
              request returns a code other than 200 (OK).
            SlackApiError: If the Slack API is reached but the response
             contains an error message.