code: def set_write_buffer_limits(self, high=None, low=None):
          
  
          # Call set_write_buffer_limits() on the transport
          self._transport.set_write_buffer_limits(high=high, low=low)
docs: Called by the client protocol to set the high- and low-water
          limits for write flow control.
  
          These two values control when call the protocol's
          ``pause_writing()`` and ``resume_writing()`` methods are
          called.
  
          :param high: The high-water limit.  Must be a non-negative
                       integer greater than or equal to ``low``, if both
                       are specified.
          :param low: The low-water limit.  Must be a non-negative
                      integer less than or equal to ``high``, if both
                      are specified.  If only ``high`` is specified,
                      defaults to an implementation-specific value less
                      than or equal to ``high``.