Simplest way for Nginx as Node.js reverse proxy [CONFIG]

simplest-nodejs-nginx-config.conf

server {
    listen 80;

    server_name domain.com;

    location / {
        proxy_pass http://mystream;
        proxy_set_header Host $http_host;
    }
}

upstream mystream {
    server __IP_ADDRESS_OF_YOUR_SERVER__:3000;
}