A generator of multiplexed data blocks read from a buffered
        response.

def _multiplexed_buffer_helper(self, response):
        """A generator of multiplexed data blocks read from a buffered
        response."""
        buf = self._result(response, binary=True)
        buf_length = len(buf)
        walker = 0
        while True:
            if buf_length - walker < STREAM_HEADER_SIZE_BYTES:
                break
            header = buf[walker:walker + STREAM_HEADER_SIZE_BYTES]
            _, length = struct.unpack_from('>BxxxL', header)
            start = walker + STREAM_HEADER_SIZE_BYTES
            end = start + length
            walker = end
            yield buf[start:end]