IE9 refuses to process XML response

Question

This is a question in relation to this one.

In UPDATE II, I added a script based on Jamie\'s feedback.

UPDATE - tl;dr:

Answer 1

• demo: http://bit.ly/HondPC

js code:

    $(function() {
        $('#uploadForm').ajaxForm({
            dataType : 'xml', // OR $('#uploadResponseType option:selected').val()
            beforeSubmit : function(a, f, o) {
                $('#uploadOutput').html('Submitting...');
            },
            success : function(data) {
                var original = $(data).find('links').find('original').text();
                $('#uploadOutput').html('');
            }
        });
    });

php code:

 base64_encode($data), 'key' => $api_key);
    $post    = http_build_query($pvars);

    $curl    = curl_init();
    curl_setopt($curl, CURLOPT_URL, 'http://api.imgur.com/2/upload.xml');
    curl_setopt($curl, CURLOPT_TIMEOUT, 30);
    curl_setopt($curl, CURLOPT_POST, 1);
    curl_setopt($curl, CURLOPT_POSTFIELDS, $post);
    curl_setopt($curl, CURLOPT_HTTPHEADER, array("Content-type: application/x-www-form-urlencoded"));
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
    $xml = curl_exec($curl); 
    curl_close ($curl);

    unlink($file);

    header('Content-type: text/xml'); 
    echo $xml;
?>