javascript - How to call ajax from anonymous host, header Access-Control-Allow-Origin: * not working

Hello i am trying to create a PHP page that can be called by ajax from anonymous host, I run my code XAMPP host and working nice, But when i try to run it fromhttp://podserver.info/ means I take a free hosting from there, it iswww.datatwo.podserver.info. I use the following PHP code

<?php 
    header('Access-Control-Allow-Origin: *');
    header('Access-Control-Allow-Methods: GET, POST, OPTIONS');
    header('Access-Control-Allow-Headers: Origin, Content-Type, Accept,Authorization, X-Request-With');
    header('Access-Control-Allow-Credentials: true');
    echo "hi";
?>
Copy code

and JavaScript ajax code is

var xmlhttp;

    if (window.XMLHttpRequest) {
        // code for IE7+, Firefox, Chrome, Opera, Safari
        xmlhttp = new XMLHttpRequest();
    } else {
        // code for IE6, IE5
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    }
    xmlhttp.onreadystatechange = function() {
        if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
            console.log(xmlhttp.responseText);
        }
    }
    xmlhttp.open("GET", "//www.datatwo.podserver.info/index.php", true);
    xmlhttp.send();
Copy code

but it only work when I use XAMPP server and when I upload it to pod server it dos not work, what can I do now?

A error message from console XMLHttpRequest cannot load http://www.datatwo.podserver.info/index.php. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://stackoverflow.com' is therefore not allowed access.