header('HTTP/1.1 503 Service Temporarily Unavailable');
header('Status: 503 Service Temporarily Unavailable');
header('Retry-After: 90');
die();
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/totalb/public_html/xmlrpc.php:5) in <b>/home/totalb/public_html/wp-includes/class-IXR.php</b> on line <b>372</b><br />
XML-RPC server accepts POST requests only.