map $http_upgrade $connection_upgrade {
  default upgrade;
  '' close;
}

server {
  server_name sudomain.your.domain;
  location / {
    proxy_pass http://localhost:3000/;
  }

  # Proxy Grafana Live WebSocket connections.
  location /api/live {
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "Upgrade";
    proxy_set_header Host $http_host;
    proxy_pass http://localhost:3002/;
  }

    listen 80;
}