php curl get location header

$post_fields=array(
	"field1"=>$value1,
	"field2"=>$value2,
);
$curl=curl_init();
curl_setopt($curl,CURLOPT_URL,'https://site.ru/path/');
curl_setopt($curl,CURLOPT_HEADER,1);
curl_setopt($curl,CURLOPT_POST,1);
curl_setopt($curl,CURLOPT_RETURNTRANSFER,1);
curl_setopt($curl,CURLOPT_FOLLOWLOCATION,false);
curl_setopt($curl,CURLOPT_POSTFIELDS,$post_fields);
$res=curl_exec($curl);
curl_close($curl);
preg_match_all('/^Location:(.*)$/mi',$res,$matches);
if(!empty($matches[1])){
	header("Location: ".trim($matches[1][0]),true,301);
}
exit();