WordPress Redirect All HTTP requests to HTTPS via .htaccess

Add code within a .htaccess file

<IfModule mod_rewrite.c>
   RewriteEngine On
   RewriteBase /

   RewriteCond %{HTTPS} !=on
   RewriteRule ^ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

   # BEGIN WordPress
   RewriteRule ^index\.php$ - [L]
   RewriteCond %{REQUEST_FILENAME} !-f
   RewriteCond %{REQUEST_FILENAME} !-d
   RewriteRule . /index.php [L]
 </IfModule>