Nginx Proxy Reverse for NodeJS App with SSL Letsencrypt

nodejs-app.conf

upstream nodejs-app {
    server 127.0.0.1:3000;
    keepalive 64;
}
 
# Server on port 80
server {
    listen 80;
    server_name app.nodejs.com;
    root /app;
 
    location / {
        # Proxy_pass configuration
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $http_host;
        proxy_set_header X-NginX-Proxy true;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_max_temp_file_size 0;
        proxy_pass http://nodejs-app/;
        proxy_redirect off;
        proxy_read_timeout 240s;
    }

    listen 443 ssl;
    ssl_certificate /etc/letsencrypt/live/app.nodejs.com/fullchain.pem;
    ssl_certificate_key /etc/letsencrypt/live/app.nodejs.com/privkey.pem;
    include /etc/letsencrypt/options-ssl-nginx.conf;

    if ($scheme != "https") {
      return 301 https://app.nodejs.com$request_uri;
    }

}