Question

I’ve set up a couple of “domain aliases” for a website which I’m using as cookie-less sub-domains, so static.domain.com/style.css serves the same file as www.domain.com/style.css.

However, if someone tries to access static.domain.com/index.htm they should be 301 redirected to www.domain.com/index.htm. The mod_rewrite rules I have in the root web directory I thought would work but they don’t seem to be.

<IfModule mod_rewrite.c>
    RewriteEngine On

    # "/res/all.20110101.css" => "/res/all.css"
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteRule ^(.+)\.(\d+)\.(js|css|png|jpg|jpeg|gif)$ $1.$3 [L]

    # Except for "static" sub-domains, force "www" when accessed without
    RewriteCond %{HTTP_HOST} .
    RewriteCond %{HTTP_HOST} !^www\.domain\.com [NC]
    RewriteCond %{HTTP_HOST} !^s-img\.domain\.com [NC]
    RewriteCond %{HTTP_HOST} !^static\.domain\.com [NC]
    RewriteRule (.*) http://www.domain.com/$1 [R=301,L]

    # If file requested is HTML, force "www" 
    <FilesMatch "\.(htm|html|php)$">
        RewriteCond %{HTTP_HOST} .
        RewriteCond %{HTTP_HOST} !^www\.domain\.com [NC]
        RewriteRule (.*) http://www.domain.com/$1 [R=301,L]
    </FilesMatch>

</IfModule>

Answer 1

After messing around a bit with vbence’s answer, I stumbled upon a more functional solution, although I’m not sure if it’s the most optimised one.

<IfModule mod_rewrite.c>
   RewriteEngine On

   # Requests for "/res/all.20110101.css" serve up "/res/all.css", etc.
   RewriteCond %{REQUEST_FILENAME} !-f
   RewriteCond %{REQUEST_FILENAME} !-d
   RewriteRule ^(.+?)\.([0-9]+)\.([a-z]+)$ $1.$3 [L]

   # If the hostname isn't www.domain.com AND requested file's extension
   # isn't in the filter list, redirect to the www.domain.com version.
   RewriteCond %{HTTP_HOST} !^www\.domain\.com$ [NC]
   RewriteCond %{REQUEST_FILENAME} !\.(js|css|png|jpe?g|gif)$ [NC]
   RewriteRule (.*) http://www.domain.com/$1 [R=301,L]

</IfModule>