Fix WordPress https error on apache and Nginx reverse proxy

If you have an error below when installing WordPress

Blocked loading mixed active content css

Blocked loading mixed active content js file

Add this code on wp-config.php

if ( $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https' ) {
        $_SERVER['HTTPS']       = 'on';
        $_SERVER['SERVER_PORT'] = '443';
        define('FORCE_SSL_ADMIN', true);
}
if ( isset($_SERVER['HTTP_X_FORWARDED_HOST'])) {
        $_SERVER['HTTP_HOST'] = $_SERVER['HTTP_X_FORWARDED_HOST'];
}