Fatal error if authcache_exit is invoked when not fully bootstrapped

yes, you are right. but the shurly module creates short urls like www.example.com/xyz without any prefix. that means, i can not block those links in the setting form with pattern. there are thousands of them, it is of course not possible to add them to the list one by one.

thanks, i tried this with no success, finally i found out because the redirect happens already in shurly_boot(), so i added drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL); then it works. but i'm not sure if there is a disadvantage to do like this

/**
 * Implements hook_boot().
 */
function shurly_boot() {
  // if the path has any unallowed characters in it (such as slashes),
  // it's not a short URL, so we can bail out and save ourselves a database call
  if (isset($_GET['q']) && shurly_validate_custom($_GET['q'])) {
    drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL);
    $row = db_query("SELECT rid, destination FROM {shurly} WHERE BINARY source = :q AND active = 1", array(':q' => $_GET['q']))->fetchObject();
    if ($row) {
      shurly_goto($row);
    }
  }
}

/**
 * Implements hook_authcache_request_exclude().
 */
function shurly_authcache_request_exclude() {
	if (isset($_GET['q']) && shurly_validate_custom($_GET['q'])) {
		return t('URL is from shurly');
	}
}

thanks, it works great.