$HTTP_RAW_POST_DATA = file_get_contents("php://input");
<br />
<b>Warning</b>:  Cannot modify header information - headers already sent by (output started at /home/greensto/public_html/xmlrpc.php:2) in <b>/home/greensto/public_html/wp-includes/class-IXR.php</b> on line <b>372</b><br />
XML-RPC server accepts POST requests only.