Ghost index in subdirectory

Could you share what you’ve tried? Generally, your Nginx configuration would need to look something like this:

    location ^~ /blog {
        proxy_pass http://localhost:2368;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $http_host;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_buffering off;
    }
}