Wordpress wp-admin behind HAproxy
This code has to be on top of the wp-config.php file right after the <?php tag. If it is somewhere in the file it doesn’t work.
/** Make sure WordPress understands it's behind an SSL terminator */ define('FORCE_SSL_ADMIN', true); define('FORCE_SSL_LOGIN', true); if ($_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https') $_SERVER['HTTPS']='on';
Source: