Force HTTPS on certain URLs and force HTTP for all others

Question

I have a client project where I need to force HTTPS for a certain folder and force HTTP for all others. I can sucessfully enforce HTTPS for the folder I desire but then all

Answer 1

This is something that works from an old client website and could be adaptable for your purposes:

#If https off and in the cart dir
RewriteCond %{HTTPS} =off [NC]
RewriteCond %{REQUEST_URI} ^/cart/(.*) [NC]
RewriteRule ^(.*)$ https://%{HTTP_HOST}/cart/%1 [R=301,L]

#If https on and not in cart dir    
RewriteCond %{HTTPS} =on
RewriteCond %{REQUEST_URI} !^/cart [NC]
#Above line actually used to read RewriteCond %{REQUEST_URI} !^/cart|media|images|thumbs|css|js [NC]
#to allow js/css/images to be served so there were no mixed ssl messages popping up to visitors
RewriteCond %{REQUEST_FILENAME} !index\.php$ [NC]
RewriteRule ^(.*)$ http://%{HTTP_HOST}/$1 [R=301,L]

RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ index.php?url=$1 [QSA,L]

Replacing cart with my perhaps