CODE EXAMPLE FOR PHP

php header pdf

<?php
header("Pragma: public");
    header("Expires: 0");
    header("Accept-Ranges: bytes");
    header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
    header("Content-Type: application/pdf");
    header("Content-Disposition: attachment; filename=order.pdf");
    header("Content-Transfer-Encoding: binary");