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<?php

$callback = 'callback';
if (isset($_REQUEST['callback'])) {
    $callback = $_REQUEST['callback'];
}

$ch = curl_init('http://localhost/' . $_REQUEST['url']);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
$response = curl_exec($ch);
curl_close($ch);

echo $callback . '(' . $response . ');';