The checkout/onepage is working with https. But, why checkout/cart is not?

http://idfr.com/checkout/cart/

https://idfr.com/checkout/onepage/

Here is fragment of the .htaccess:

#

enable rewrites

Options +FollowSymLinks

RewriteEngine on

RewriteCond %{REQUEST_URI} checkout\/onepage

RewriteCond %{HTTPS} off

RewriteCond %{REQUEST_URI} checkout/

RewriteRule ^(.*)$ https://%{HTTP_HOST}/$1 [R=301,L]

RewriteRule ^checkout/$ https://idfr.com/checkout/ [R=301,L]

#

• Apache version: Apache/2.4.7 (Ubuntu)

• operating system: Windows 8.1

• indications in the log files; Main ErrorLog: "/var/log/apache2/error.log"