PHPSimpleProxy.php

<?php
// PHP Simple Proxy
// Responds to GET or POST

//I would use session or other checks to prevent abuse.
//do not put it in the wild without limiting usage to a domain, list of urls etc

$url = ($_POST['url']) ? $_POST['url'] : $_GET['url'];
$url = urldecode($url);
if(empty($url)){
	echo "nothing to download";
	exit;
}
$filename = ($_POST['filename']) ? $_POST['filename'] : $_GET['filename'];

//start cURL session
$session = curl_init($url);

// Put the POST data in the body, if needed
if ($_POST['url']) {
	$postvars = '';
	while ($element = current($_POST)) {
		$postvars .= key($_POST).'='.$element.'&';
		next($_POST);
	}
	curl_setopt ($session, CURLOPT_POST, true);
	curl_setopt ($session, CURLOPT_POSTFIELDS, $postvars);
}

curl_setopt($session, CURLOPT_HEADER, false);
curl_setopt($session, CURLOPT_FOLLOWLOCATION, true); 
//curl_setopt($ch, CURLOPT_TIMEOUT, 4); 
curl_setopt($session, CURLOPT_RETURNTRANSFER, true);

// Make the call
$response = curl_exec($session);
curl_close($session);
$mimeType = '';
//if you need try detect mime and add back to response
if ($mimeType != ""){
header("Content-Type: ".$mimeType);
}
if(!empty($filename)){
header('Content-Disposition: attachment; filename="'.$filename.'"');
}
echo $response;
?>