Config of NGINX as reverse proxy

Open confix on the following path: /etc/nginx/sites-enabled:

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

server {
    listen              443 ssl;

    ssl_certificate     /etc/ssl/paletter.front/paletter.dev.crt;
    ssl_certificate_key /etc/ssl/paletter.front/ssl-paletter.key;

    server_name         paletter.dev;
    access_log          /var/log/nginx/nginx.vhost.access.log;
    error_log           /var/log/nginx/nginx.vhost.error.log;

    location / {
        proxy_http_version 1.1;
        proxy_set_header   Upgrade $http_upgrade;
        proxy_set_header   Connection $connection_upgrade;
        proxy_set_header   X-Forwarded-For $remote_addr;
        proxy_set_header   Host $http_host;
        proxy_pass         http://localhost:3000;
    }
}