function __construct()
 {
     $this->auth_name = 'openid_verify';
     // $this->field_name = array('openid.server','openid.delegate','ts','page');
     $this->field_name = array('author', 'server_url', 'local_id', 'ts', 'page');
     $this->response = array();
     parent::__construct();
 }