Chat+ on an Nginx server

I am looking at setting up Chat+ on a server that will be using Nginx as the webserver.

Just replace $VAR_SITE_CHAT_DOMAIN with your real domain and $VAR_SITE_DOMAIN with your main site domain where SSL certificate is installed.

server {
    listen 80;
    server_name  $VAR_SITE_CHAT_DOMAIN;
    rewrite   ^  https://$VAR_SITE_CHAT_DOMAIN$request_uri? permanent;
}

server {
    listen 443 ssl;
    server_name $VAR_SITE_CHAT_DOMAIN;
    ssl on;
    ssl_protocols  SSLv2 TLSv1;

    ssl_certificate /etc/letsencrypt/live/$VAR_SITE_DOMAIN/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/$VAR_SITE_DOMAIN/privkey.pem;

    access_log  /var/log/nginx/chat.access.log;
    error_log  /var/log/nginx/chat.error.log;

    client_max_body_size 200M;

    root   /var/www/vhosts/mainsite/chat;

    location / {
        proxy_pass       http://127.0.0.1:3000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_set_header Host $http_host;

        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forward-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forward-Proto $scheme;
        proxy_set_header X-Nginx-Proxy true;

        proxy_redirect   off;
    }

}

Thanks Alex, your help is appreciated.