If you are playing with domain hack as I am, one thing to think about is to redirect the visitors reaching the primary domain to the sub-domain. For instance, I want to make sure whoever visits "http://icio.us" gets redirected to "http://del.icio.us" properly.
How do we do that? The answer varies depending on the method we take. I’m introducing a way which takes advantage of the mod_rewrite feature of apache servers.
The relative paths look something like this:
/ <- http://icio.us
/del/ <- http://del.icio.us
Establish a .htaccess file in the root directory with content below:
RewriteRule ^(.*) http://del.icio.us/$1 [R,L]
This way each request to "http://icio.us" will be redirected to "http://del.icio.us". Follow the htaccess tutorial and modify RewriteRule to create more complicated redirection rules as you wish.