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redirect mydomain.com to www.mydomain.com

I would like to know how to do the following:

redirect mydomain.com to www.mydomain.com

Currently when a user types in mydomain.com the can browse the website just the same as using www.mydomain.com. This creates a problem on SSL pages because the cert is for www.mydomain.com and when users access the site using mydomain.com they get a warning that the site name does not match the cert. How can I automatically redirect anyone who types in mydomain.com to www.mydomain.com.

Keep in mind that the solution needs to be global because there are search engine listings for links such as mydomain.com/directory/file.html and I would want these automatically change to www.mydomain.com/directory/file.html. Manually entering each file in an htaccess file is not an option.

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humeniuk

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zefon

ASKER

A big thank you Humeniuk. Works like a charm. Now I just have a couple of things to clear up:

I have other domain names pointing to this site and I took your code and it worked on them too. Do I need to use a separate RewriteCond and RewriteRule for each or can I combine it all it one?

Example:

RewriteEngine on
RewriteCond %{HTTP_HOST} ^domain1\.com ^domain2\.com
RewriteRule ^(.*)$ http://www.domain.com/$1 [R=permanent,L]

or this

RewriteEngine on
RewriteCond %{HTTP_HOST} ^domain1\.com
RewriteRule ^(.*)$ http://www.domain.com/$1 [R=permanent,L]
RewriteEngine on
RewriteCond %{HTTP_HOST} ^domain2\.com
RewriteRule ^(.*)$ http://www.domain.com/$1 [R=permanent,L]

Do I need the RewriteEngine on for each instance or only once?

Also, for SSL would this work?

RewriteEngine on
RewriteCond %{HTTPS_HOST} ^domain\.com
RewriteRule ^(.*)$ https://www.domain.com/$1 [R=permanent,L]

humeniuk

Yes, this would also work for SSL.

"Do I need to use a separate RewriteCond and RewriteRule for each or can I combine it all it one?"
Take a look at the syntax in the SitePoint link above. It shows how you can use it for a single site or for all sites on the server depending on where you place it.