// Redirect users to the OpenCart installation url preventing cross-origin resource sharing policy errors.
$https = isset($_SERVER['HTTPS']) && (($_SERVER['HTTPS'] == 'on') || ($_SERVER['HTTPS'] == '1'));

$current_url = parse_url(($https ? 'https' : 'http') . '://' . $_SERVER['HTTP_HOST'] . rtrim(dirname($_SERVER['PHP_SELF']), '/.\\') . '/');
$correct_url = parse_url($https ? HTTPS_SERVER : HTTP_SERVER);

if ($current_url !== $correct_url) {
if (dirname($_SERVER['PHP_SELF']) !== '/') {
$url = str_replace(dirname($_SERVER['PHP_SELF']), '', $_SERVER['REQUEST_URI']);
} else {
$url = $_SERVER['REQUEST_URI'];
}

$url = ($https ? HTTPS_SERVER : HTTP_SERVER) . ltrim($url, '/');

if (!headers_sent()) {
header('Location: ' . $url);
} else {
echo '<script>location = "' . $url . '";</script>';
}

exit;
}