apache - Mod rewrite for fake subdomains?

Question

I really tried tons of methods but i'm not successful. I want a .Htaccess code to do the following :

I want to rename this : http://www.mydomain.com/media --> http://media.mydomain.com

So, By example instead of calling this : http://www.mydomain.com/media/XXX/picture.jpg i will call : http://media.mydomain.com/XXX/picture.jpg

Thank you

Answer 1

It's gonna be like this:

RewriteEngine on
RewriteCond %{HTTP_HOST} ^(?!www.)([^.]+).mydomain.com$
RewriteRule (.*) http://www.mydomain.com%1$1 [L,R=301]