Whitelisting domains for WordPress CORS

This quick tip will share some code for how you can whitelist domains in WordPress to allow for Cross Origin Request Sharing (CORS).

add_filter( 'allowed_http_origins', 'mytheme_add_origins' );
 * Add origins for CORS
function mytheme_add_origins( $origins ) {
    $origins[] = 'http://subdomain.mysite.com';
    $origins[] = 'http://someothersite.com';
    return $origins;

Thats it! Now, your site will allow any of the domains you added to hit your Ajax URLs without running into any Access-Control-Allow-Origin error responses.

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