PHP streaming proxy with support for Range requests (perfect for proxying video files with progressive download MP4 streaming)

proxy.php

<?php
error_reporting(0);
set_time_limit(0);
ob_end_clean();

$url = $_GET['url'];

if(isset($_SERVER['HTTP_RANGE'])) {
	stream_context_set_default([
		'http' => [
			'header' => "Range: " . $_SERVER['HTTP_RANGE']
		]
	]);
}

$headers = get_headers($url, 1);

header($headers[0]);

if(isset($headers['Content-Type'])) { header('Content-Type: ' . $headers['Content-Type']); }
if(isset($headers['Content-Length'])) { header('Content-Length: ' . $headers['Content-Length']); } 
if(isset($headers['Accept-Ranges'])) { header('Accept-Ranges: ' . $headers['Accept-Ranges']); }
if(isset($headers['Content-Range'])) { header('Content-Range: ' . $headers['Content-Range']); }

if($_SERVER['REQUEST_METHOD'] == 'HEAD') { exit; }

$fp = fopen($url, 'rb');
while(!feof($fp)) {
	echo fread($fp, 1024 * 256); flush();
}
fclose($fp);