redirect port 80 to 443
NameVirtualHost *:80
<VirtualHost *:80>
ServerName mysite.example.com
DocumentRoot /usr/local/apache2/htdocs
Redirect /secure https://mysite.example.com/secure
</VirtualHost>
<VirtualHost _default_:443>
ServerName mysite.example.com
DocumentRoot /usr/local/apache2/htdocs
SSLEngine On
# etc...
</VirtualHost>