nginx http force redirect to https

server{
  listen 80;
  server_name ixf.io;
  rewrite ^ https://$http_host$request_uri? permanent; # force redirect http to https
}
server {
  listen 443 ssl;
  server_name ixf.io;
  ssl on;
  ssl_certificate /etc/letsencrypt/live/ixf.io/fullchain.pem;
  ssl_certificate_key /etc/letsencrypt/live/ixf.io/privkey.pem;
  ...
}