<?php
require_once 'http.php';

// fill this with actual values
$url = 'http://www.google.ru/images/srpr/logo3w.png';
$file_size = 7007;
$name = 'test.bin';

$server_http_range = isset($_SERVER['HTTP_RANGE']) ? $_SERVER['HTTP_RANGE'] : false;

$request_ranges = array();

if ($server_http_range) {
  $range_list = HTTP\parse_range_request($file_size, $server_http_range);

  if ($range_list === false) {
    exit();
  }

  if (empty($range_list)) {
    header('Status: 416 Requested range not satisfiable');
    exit();
  }

  foreach ($range_list as $range) {
    $request_ranges[] = $range->get_first_pos() . '-' . $range->get_last_pos();
  }

  header('Status: 206 Partial Content');
} else {
  $request_ranges[] = "0-" . ($file_size - 1);

  header('Status: 200 Ok');
  header('Content-Length: ' . $file_size);
}

header('Content-Type: application/octet-stream');
header('Accept-Ranges: bytes');
header('Content-Disposition: attachment; filename="' . $name . '";');

$ch = curl_init();
curl_setopt($ch, CURLOPT_VERBOSE, 1);
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RANGE, implode(',', $request_ranges));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 0);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($ch, CURLOPT_USERAGENT, $user_agent);
$result = curl_exec($ch);

curl_close($ch);

?>