function index()
 {
     StaticPublisher::set_echo_progress(true);
     $page = singleton('Page');
     if (!$page->hasMethod('allPagesToCache')) {
         user_error('RebuildStaticCacheTask::index(): Please define a method "allPagesToCache()" on your Page class to return all pages affected by a cache refresh.', E_USER_ERROR);
     }
     if (!empty($_GET['urls'])) {
         $urls = $_GET['urls'];
     } else {
         $urls = $page->allPagesToCache();
     }
     $this->rebuildCache($urls, true);
 }