htaccess mod_rewrite: Force using https, but not on subdomains

Question

I want to force users to use https on my site. I use this piece of code in the htaccess:

RewriteEngine On 
RewriteCond %{SERVER_PORT} 80 
RewriteRule ^(.*)$ https://www.mysite.com/$1 [R,L]

It all works fine, expect that it forces https on subdomains too (eg. subdomain.mysite.com is forced to https as well). I want to force only my domain to https, and not any of the subdomains.

How to do this?

Answer 1

Here's what should work:

RewriteEngine On 
RewriteCond %{HTTP_HOST} (www\.){0,1}mydomain\.com [NC]
RewriteCond %{SERVER_PORT} 80 
RewriteRule (.*) https://www.mysite.com/$1 [R,L]

Please tell me if it did the trick ;)