NGINX Virtual Host Config with http->https redirection (Certbot)

etc-nginx-sites-available.conf

server {
  server_name example.com;

  root /home/ls/app/;
  index index.html;

  location / {
          try_files $uri $uri/ =404;
#             try_files $uri /index.html =404;
  }

  listen [::]:443 ssl ipv6only=on; # managed by Certbot
  listen 443 ssl; # managed by Certbot
  ssl_certificate /etc/letsencrypt/live/example.com/fullchain.pem; # managed by Certbot
  ssl_certificate_key /etc/letsencrypt/live/example.com/privkey.pem; # managed by Certbot
  include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
  ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot

}

server {
    if ($host = example.com) {
        return 301 https://$host$request_uri;
    } # managed by Certbot

    listen 80;
    listen [::]:80;

    server_name example.com;
    return 404; # managed by Certbot

}