I need to force specific pages to use SSL which I've done using mod_rewrite in .htaccess:

RewriteCond %{SERVER_PORT} !^443$
RewriteRule ^my_dir(.*)$ http://%{HTTP_HOST}/my_dir$1 [R=301,L]

I'm having trouble switching back to non-SSL when moving out of the my_dir folder. Something like this should work:

#RewriteCond %{SERVER_PORT} ^443$
#RewriteCond %{THE_REQUEST} !my_dir
#RewriteRule ^(.*)$ http://%{HTTP_HOST}/$1 [R=301,L]

But it doesn't. Can anyone provide any guidance to get this working?

I've also had to set define('REDIRECT_TO_BASE_URL', false) in site.php to prevent redirect loops but I'm not sure what the implications of this might be. Could this break anything?

Thanks
Joe