def write(self, chunk):
        """Write unbuffered data to the client."""
        if self.chunked_write and chunk:
            chunk_size_hex = hex(len(chunk))[2:].encode('ascii')
            buf = [chunk_size_hex, CRLF, chunk, CRLF]
            self.conn.wfile.write(EMPTY.join(buf))
        else:
            self.conn.wfile.write(chunk)
Write unbuffered data to the client.