Alternative way to force any HTTP request to redirect to HTTPS by adding the first three lines to your WordPress .htaccess file. The next bit is WordPress' way of handling Pretty Permalinks.

.htaccess

RewriteEngine On 
RewriteCond %{SERVER_PORT} 80 
RewriteRule ^(.*)$ https://www.example.com/$1 [R=301,L,NE]

# Please make sure to replace the example.com domain name in line 3 with your own

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