HTTP Error Code 403.4

If I type http://www.zurichlifeinternational.com/, the web server has intelligence to return a page which tells me that the web site must be accessed by SSL and a preceding https should be before the web address.



Some people might say it is a clever setting and some might say why bother, just redirect to access the same address by https. I tend to support the latter. For the former, I think it has something to do with redirecting to an alert page upon detecting error code 403.4. Just don't know if this is easy to configure in the server side ?