KPcM8k4A

Prevent caching across browser instances in Android (using zxing)
header("Cache-Control: no-store, no-cache, must-revalidate");
header("Expires: Sat, 26 Jul 1997 05:00:00 GMT"); // Date in the past
header("Pragma: no-cache");
header('Location: ' . generateAOneTimeURL(), TRUE, 307 );