code: private static String getContentPath(HttpServletRequest request) {
  
      String contentPath = (String)request.getAttribute(Value.CONTENTPATH_ATTRIBUTE);
      if (contentPath == null) {
        // fallback to suffix if CONTENTPATH_ATTRIBUTE is not set
        // (e.g. in inside a /libs/granite/ui/components/foundation/form/multifield component)
        contentPath = ((SlingHttpServletRequest)request).getRequestPathInfo().getSuffix();
      }
  
      return contentPath;
    }
docs: Current content path
  @param request Request
  @return Current content path or null