protected function __construct($api_key, $after_compress_callback)
 {
     parent::__construct($after_compress_callback);
     $this->api_key = $api_key;
 }
 protected function __construct($api_key, $after_compress_callback)
 {
     parent::__construct($after_compress_callback);
     $this->proxy = new WP_HTTP_Proxy();
     \Tinify\setAppIdentifier(self::identifier());
     \Tinify\setKey($api_key);
 }