http://symfony.com/doc/current/book/http_cache.html#cache-invalidation http://showmethecode.es/php/symfony/symfony2-reverse-proxy-borrar-la-cache-de-una-url/

http://php-and-symfony.matthiasnoback.nl/2011/11/symfony2-define-your-bundles-configuration-values-using-the-treebuilder/

use Symfony\Component\Validator\Constraints\True; // in your buildForm() method: $builder ->add("firstName", "text") ->add("lastName", "text") ->add("emailAddress", "email") ->add("t_and_c", "checkbox", array( "mapped" => false, "constraints" => new True(array( "message" => "Please accept the Terms and conditions in order to register") ), ) );