return buf.toString();
    }

    protected void sendToGoogleChat(final CardView cardView, final SMailPostingDiscloser discloser) {
        // https://developers.google.com/hangouts/chat/how-tos/webhooks
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final String googleChatWebhookUrls = fessConfig.getGoogleChatWebhookUrls();
        if (StringUtil.isBlank(googleChatWebhookUrls)) {

    public static final String SLACK_WEBHOOK_URLS_PROPERTY = "slack.webhook.urls";

    public static final String GOOGLE_CHAT_WEBHOOK_URLS_PROPERTY = "google.chat.webhook.urls";

    public static final String USE_BROWSER_LOCALE_FOR_SEARCH_PROPERTY = "search.use.browser.locale";

    public static final String SUGGEST_SEARCH_LOG_PROPERTY = "suggest.searchlog";