WordPress CORS plugin

cors-in-wp.php

<?php

/**
 * Plugin Name: CORSWP - CORS in WordPress
 * Plugin URI: http://leepowers.co/
 * Description: Enable CORSWP in WordPress
 * Version: 0.0.1
 * Author: Lee Powers
 * Author URI: http://leepowers.co/
 * Text Domain: cors-in-wp
 */

/**
* Output CORS for all preflight OPTIONS calls.
*/
function cors_in_wp_cors_preflight() {
    if ($_SERVER["REQUEST_METHOD"] === "OPTIONS") {
        status_header(200);
        $this->cors_in_wp_headers();
        die;
    }
}
add_action("init", "cors_in_wp_cors_preflight");

/**
* Output CORS headers
*/
function cors_in_wp_headers() {
    header("Access-Control-Allow-Origin: *");
    header("Access-Control-Allow-Headers: *");
    header("Access-Control-Allow-Methods: *");
    header("X-Frame-Options", "SAMEORIGIN");
}