Question

I’m calling ajax.php with jQuery. It returns a JSON response all the time.

    $.ajax({
        type: 'POST',
        url: 'ajax.php',
        data: 'some=info',
        dataType: 'json',
        success: function(data) {
            if(data != null) {
                console.log(data);
            } else {
                alert('IE fails here!');
            }
        }
    });

The Ajax always returns some data in JSON format. It works fine on all browsers except IE (tested on IE 7, 8 and 9). In IE it always prints the alert (which means that it never receives the response information). Any ideas?

Update 1: I just confirmed that the post is never successful in IE, that is why data is always null.

Update 2: the post arrives but returns null only when it is IE.

Update 3 (solution): my fault, the ajax was protecting against calls from other servers. It uses an if() statement at the beginning which asks $_SERVER[‘HTTP_REFERER’]’s host be the host of the same server. Now the question would be, why doesn’t IE recognize the $_SERVER[‘HTTP_REFERER’] in the ajax call?

This is the api code (php)

    if($_SERVER['REQUEST_METHOD'] == 'POST') {
        $security = parse_url($_SERVER['HTTP_REFERER']);
        if(in_array($security['host'],array('localhost','tradukka.com','173.203.198.123'))) {
            header('Content-type: application/json');
            $array = array('nice','data','for','api');
                echo json_encode($translation);
            }
        }
    }

IE fails at the $_SERVER[‘HTTP_REFERER’] check :s

Answer 1

the ajax was protecting against calls from other servers. It uses an if() statement at the beginning which asks $_SERVER[‘HTTP_REFERER’]’s host be the host of the same server. the machines where i was testing on IE didn’t get the host’s name; instead it had the ip value, that is why it always threw false.