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/usr/share/javascript/jquery-jfeed/proxy.php is in libjs-jquery-jfeed 10-2ubuntu2.

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<?php
header('Content-type: application/xml');
$handle = fopen($_REQUEST['url'], "r");

if ($handle) {
    while (!feof($handle)) {
        $buffer = fgets($handle, 4096);
        echo $buffer;
    }
    fclose($handle);
}
?>