балансировка через редирект на nginx

split_clients "${remote_addr}${http_user_agent}${date_gmt}" $variant {
  25% dg1;
  25% dg2;
  25% dg3;
  25% dg4;
}

server {
    listen   80;
    listen   443 ssl;

    server_name domain.lan;

    if ($variant = dg1) {
        set $redirect_url https://domain1.lan/url1;
    }
    if ($variant = dg2) {
        set $redirect_url https://domain2.lan/url1;
    }
    if ($variant = dg3) {
        set $redirect_url https://domain1.lan/url2;
    }
    if ($variant = dg4) {
        set $redirect_url https://domain2.lan/url2;
    }

    location / {
        return 302 $redirect_url;
    }
}