What is the issue with connecting two different pages on two different servers using PHP?

When connecting two different pages on two different servers using PHP, the main issue is the cross-origin resource sharing (CORS) policy. This policy restricts web pages from making requests to a different domain than the one that served the page. To solve this issue, you can set the appropriate headers in the PHP script on the server that you are making the request to, allowing cross-origin requests. 

<?php
header("Access-Control-Allow-Origin: *");
header("Access-Control-Allow-Methods: GET, POST, OPTIONS");
header("Access-Control-Allow-Headers: Content-Type");

Keywords

Cross-origin CORS XMLHttpRequest server-side authentication

Related Questions