Wordpress is just broken. (HTTPS behind reverse proxy)

[w4tsn]

/**
 * For WordPress, force the protocol scheme to be HTTPS
 * when is_ssl() doesn't work, e.g. on a reverse proxied server
 * where _SERVER['HTTPS'] and _SERVER['SERVER_PORT'] don't
 * indicate that SSL is being used.
 */
if ($_SERVER['HTTP_X_FORWARDED_PROTO'] === 'https')
    $_SERVER['HTTPS'] = '1';
 
if (isset($_SERVER['HTTP_X_FORWARDED_HOST'])) {
    $_SERVER['HTTP_HOST'] = $_SERVER['HTTP_X_FORWARDED_HOST'];