Как сохранить HTML блок в pdf и предложить пользователю его скачать?

$('#save_route').click(function(event) {
	startPreloader();
	$.ajax({
		url: '/wp-admin/admin-ajax.php',
		type: "POST",
		data: "action=get_pdf",
		success: function(response){
			console.log(response);
			stopPreloader();
		}
	});
});

function get_pdf(){
	$apikey = 'e9c18905-cf-9a58-5cebbd9826d1';
	$value = 'yandex.ru';
	$result = file_get_contents("http://api.html2pdfrocket.com/pdf?apikey=" . urlencode($apikey) . "&value=" . urlencode($value));

	header('Content-Description: File Transfer');
	header('Content-Type: application/pdf');
	header('Expires: 0');
	header('Cache-Control: must-revalidate');
	header('Pragma: public');
	header('Content-Length: ' . strlen($result));
	 
	header('Content-Disposition: attachment; filename=' . 'alias-name.pdf' );

	echo $result;
	wp_die();
}