Redirection via HTTPS (Apache Users)

Hello.

I have a question about 301 redirection of https.

My website is accessible with both of non-subdomain http(s)://mydomain.com and subdomain-www http(s)://www.mydomain.com. Both have the same IP address.

I would like to change https://mydomain.com/ to redirection for https://www.mydomain.com/.

To change for redirecting all web contents under mydomain.com including user directory /~user and so on, I tried to add the following to /etc/apache2/mods-available/ssl.conf or /etc/apache2/sites-available/default-ssl.conf.

RewriteEngine On

RewriteCond %{HTTP_HOST} ^(mydomain\.com)(:443)?

RewriteRule (.*) https://www.mydomain.com$1 [R=301]

</IfModule>

After this, I did do "service apache2 restart" of course.

But it looks like the redirection does not work.

What should I do?

In case of normal http, it works by adding the above to /etc/apache2/sites-available/000-default.conf and /etc/apache2/mods-available/userdir.conf.

Environments:

Apache version:2.4.7

OS:Ubuntu 14.04.1 LTS

Kernel:Linux 2.6.32-042stab093.5 #1 SMP

Thank you for your time and assistance.

Yusui Tomikawa