HTTP_REFERER->
このPHPはcURLでREFERERを「http://ipvx.info/」として実行しています。（正規）

stdClass Object
(
    [error] => stdClass Object
        (
            [code] => 403
            [message] => Method doesn't allow unregistered callers (callers without established identity). Please use API Key or other form of API consumer identity to call this API.
            [errors] => Array
                (
                    [0] => stdClass Object
                        (
                            [message] => Method doesn't allow unregistered callers (callers without established identity). Please use API Key or other form of API consumer identity to call this API.
                            [domain] => global
                            [reason] => forbidden
                        )

                )

            [status] => PERMISSION_DENIED
        )

)