build-on:
                - SUCCESS
                - FAILURE
                - UNSTABLE
              build-steps:
                - http-request:
                    url: https://homer.app.elstc.co/webhook/jenkins/build-finished
                    mode: GET
                    custom-headers:
                      - name: X-Jenkins-Build

     * @param discloser the mail posting discloser
     */
    protected void sendToSlack(final CardView cardView, final SMailPostingDiscloser discloser) {
        // https://api.slack.com/messaging/webhooks#posting_with_webhooks
        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        final String slackWebhookUrls = fessConfig.getSlackWebhookUrls();
        if (StringUtil.isBlank(slackWebhookUrls)) {