DNS can’t be used for this purpose. You should look into Strict Transport Security instead.

What type of web server are you running?

If you are using Apache, add the following to your .htaccess file:
“`# Force HTTPS
RewriteCond %{HTTPS} off
RewriteRule ^ https://%{HTTPHOST}%{REQUESTURI} [L,R=301]

Let me add, if you are using nginx, you need to add the following to you rewrite config file:
if ($scheme = ‘http’) {
rewrite ^/(.*)$ https://mywebsite.com/$1 permanent;
}