Редик http/s На www  

<IfModule mod_rewrite.c>
Options +FollowSymLinks
RewriteEngine On
RewriteCond %{HTTP_HOST} ^mysite.com$ [NC]
RewriteRule ^(.*)$ https://www.mysite.com/$1 [R=301,L]
</IfModule>

Редик с www на http/s

<IfModule mod_rewrite.c>
Options +FollowSymLinks
RewriteEngine on
RewriteCond %{HTTP_HOST} ^www\.mysite\.com$ [NC]
RewriteRule ^(.*)$ https://mysite.com/$1 [R=301,L]
</IfModule>