String file = request.getRequestURI();
if (request.getQueryString() != null) {
   file += '?' + request.getQueryString();
}
URL reconstructedURL = new URL(request.getScheme(),
                               request.getServerName(),
                               request.getServerPort(),
                               file);
out.println(URL.toString());

• UrlRewriteFilter

httpResponse.setHeader("Cache-Control", "no-cache");
httpResponse.setHeader("Pragma", "No-cache");
httpResponse.setHeader("Expires", "0");