for _, p := range ext.params {
		switch p {
		case "client_no_context_takeover":
			copts.clientNoContextTakeover = true
			continue
		case "server_no_context_takeover":
			copts.serverNoContextTakeover = true
			continue
		}
                //add code
		if strings.HasPrefix(p, "server_max_window_bits") {
			fmt.Println("server_max_window_bits:", p)
			continue
		}
		return nil, fmt.Errorf("unsupported permessage-deflate parameter: %q", p)
	}