Cross-Origin Request Headers(CORS) with PHP headers

Question

I have a simple PHP script that I am attempting a cross-domain CORS request:

Answer 1

I got the same error, and fixed it with the following PHP in my back-end script:

header('Access-Control-Allow-Origin: *');

header('Access-Control-Allow-Methods: GET, POST');

header("Access-Control-Allow-Headers: X-Requested-With");