code: public static String getUnmappedUrl(SlingHttpServletRequest request, String url) {
          return getUrl(request, url, null, null, LinkMapper.CONTEXT);
      }
docs: Builds a unmapped link to a path (resource path) without selectors and a determined extension.
  
  @param request the request context for path mapping (the result is always mapped)
  @param url     the URL to use (complete) or the path to an addressed resource (without any extension)
  @return the unmapped url for the referenced resource