Wordpress behind NGINX reverse proxy

nginx-vhost.conf

        location /blog/ {
                #auth_basic "Restricted";
                #auth_basic_user_file /etc/nginx/.htpasswd;
                  proxy_pass https://test-blog.bitstarz.com/;
                  proxy_set_header X-Forwarded-Host $host;
                  proxy_set_header X-Forwarded-Proto $scheme;
        }

wp-config.php

// Proxy fix
define( 'WP_SITEURL', '/blog' );
define( 'WP_HOME', '/blog' );

if ($_SERVER['HTTP_X_FORWARDED_PROTO'] === 'https')
    $_SERVER['HTTPS'] = 'on';

if (isset($_SERVER['HTTP_X_FORWARDED_HOST'])) {
    $_SERVER['HTTP_HOST'] = $_SERVER['HTTP_X_FORWARDED_HOST'];
}

$_SERVER['REQUEST_URI'] = "/blog".$_SERVER['REQUEST_URI'];