server {
    listen       9999;
    server_name  localhost;
    add_header Access-Control-Allow-Origin *;
    add_header Access-Control-Allow-Methods *;
    add_header Access-Control-Allow-Headers *;
    if ($request_method = 'OPTIONS') {
        return 204;
    }    
    

    location /nps/ {
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header REMOTE-HOST $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-NginX-Proxy true;
        proxy_pass http://localhost:8181; # страница порт
    }
}