code: def get_http_connection(self, host, is_secure):
          
          if is_secure:
              return AsyncHTTPSConnection(host, http_client=self._httpclient)
          else:
              return AsyncHTTPConnection(host, http_client=self._httpclient)
docs: Gets a connection from the pool for the named host.  Returns
          None if there is no connection that can be reused.