code: static private String getPostBackUrlFromHTML(String html)
    {
      Document doc = Jsoup.parse(html);
      Elements e1 = doc.getElementsByTag("body");
      Elements e2 = e1.get(0).getElementsByTag("form");
      String postBackUrl = e2.first().attr("action");
      return postBackUrl;
    }
docs: Extracts post back url from the HTML returned by the IDP
  
  @param html
  @return