Performs an HTTP 302 redirect (for the 1.x protocol).
function openid_redirect_http($url, $message) {
$query = array();
foreach ($message as $key => $val) {
$query[] = $key . '=' . urlencode($val);
}
$sep = strpos($url, '?') === FALSE ? '?' : '&';
header('Location: ' . $url . $sep . implode('&', $query), TRUE, 302);
drupal_exit();
}