Loading Java ImageIcon with Image Served by PHP Script

Question

I need to create an ImageIcon from an image on a remote server. When I loaded it with a URL like http://www.server.com/1.png it worked fine.

But recently the server was changed so that the images are stored outside of web root and must be accessed with something like http://www.server.com/get_image.php?id=1, where get_image.php outputs the correct headers to serve the image. When I create an ImageIcon with that type of URL, it fails to load without throwing any exceptions and getImageLoadStatus() returns MediaTracker.ERRORED. The image serving script works fine from a browser.

Any ideas on how could I make this work?

Thanks.

Edit: Here's the Java code.

ImageIcon labelIcon = new ImageIcon(new URL(IMAGE_URL));
System.out.println(labelIcon.getImageLoadStatus());

I also tried the following, but it didn't work either.

ImageIcon labelIcon = new ImageIcon();
BufferedImage image = ImageIO.read(new URL(IMAGE_URL));
labelIcon.setImage(image);

Edit: Here's the code from get_image.php. $DB is an object included from global.php that is used to interact with a MySQL database. I've verified that the MIME type being returned is image/png.

<?php
    if (isset($_GET['uid']))
    {
        require_once('./include/global.php');       
        getUpload(intval($_GET['uid']));
    }

    function getUpload($id)
    {
        global $DB;

        $query = "SELECT `name`, `mime_type` FROM `uploads` WHERE `id` = " . $id . " LIMIT 1";
        $arrUpload = $DB->getSingleRecord($query);

        if (count($arrUpload) > 0)
        {
            $file = UPLOADS_ROOT . $arrUpload['name'];
            header("Content-type: " . $arrUpload['mime_type']);
            header("Content-Disposition: filename=" . $arrUpload['name']);
            readfile($file);
        }
        else
        {
            header("HTTP/1.1 404 Not Found");
        }
        die();
    }
?>

Answer 1

The server may be returning the wrong content type: make sure that its properly setting the content-type header to image/png on the response.

Answer 2

One of the reasons that ImageIcon(URL) may fail is that the response didn't return status 200. Ensure that the URL didn't returned a redirect (status 301/302) or so. Also ensure that the request parameter name is correct. You used id in URL, but the PHP script expects uid.

To play a bit around yourself just to check what response headers the Java code actually gets, try this one:

URL url = new URL("http://www.server.com/get_image.php?id=1");
URLConnection connection = url.openConnection();
for (Entry<String, List<String>> header : connection.getHeaderFields().entrySet()) {
    System.out.println(header.getKey() + "=" + header.getValue());            
}