Для редиректа http > https добавьте в начало файла .htaccess

RewriteEngine On
RewriteCond %{HTTP:X-Forwarded-Proto} !https
RewriteRule ^(.*)$ https://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]

Для редиректа https > http

RewriteEngine On
RewriteCond %{HTTP:X-Forwarded-Proto} https
RewriteRule ^(.*)$ http://%{HTTP_HOST}%{REQUEST_URI} [L,R=301]