worker_processes 4;
events{
    worker_connections 1024;
}

http{
    server {
        listen 80;
            server_name myserver;

        location / {
            proxy_pass http://mysite;
        }
    }

    upstream mysite {
        server 100.101.56.52:8012;
        server 100.101.56.52:8013;
    }
}

        public ActionResult CreateQrCode(string url)
        {
            var stream = QRCodeGenerate.BuildQrCode(url);

            return File(stream, "image/png");
            //return Content(url);
        }