Nginx SSL proxy for NodeJS

nginx.conf

server {
    listen 443 ssl;
    server_name api.sandbox.gitwit.dev;
    ssl_certificate /etc/letsencrypt/live/api.sandbox.gitwit.dev/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/api.sandbox.gitwit.dev/privkey.pem; # managed by Certbot


    location / {
        proxy_pass http://localhost:4000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_cache_bypass $http_upgrade;
    }

}