shell bypass 403
<?php
/**
* File: Support_Page_View_DoneContent.php
*
* @package W3TC
*/
namespace W3TC;
require W3TC_INC_DIR . '/options/common/header.php';
?>
<div style="text-align: center; font-weight: bold; margin-top: 50px">
Thank you for filling out the form
</div>
<iframe src="<?php echo esc_attr( $postprocess_url ); ?>" width="0" height="0"></iframe>