Allow cors in PHP

cors.php

header("Content-Type: application/json;charset=utf-8");
header("Access-Control-Allow-Origin: *");
header("Access-Control-Allow-Headers: Content-Type, Authorization");
header("Access-Control-Allow-Methods: POST, OPTIONS");
header("Allow: POST, OPTIONS");
$method = $_SERVER['REQUEST_METHOD'];
if ($method == "OPTIONS") {
  die();
}