/**
* Set/get cachable state for the response.
*
* If $allow is set, sets the cachable state of the response. Always returns current state.
*
* @param boolean $allow True to allow browser caching.
*
* @return boolean True if browser caching should be allowed
*
* @since 11.1
*/
public static function allowCache($allow = null)
{
if (!is_null($allow)) {
self::$cachable = (bool) $allow;
}
return self::$cachable;
}