Redirect (almost) all subdomains to www?

[António P. P. Almeida]

On 28 Set 2010 14h15 WEST, lists at ruby-forum.com wrote:

> I have two "server" directives.
>
> One has:
>
> server_name www.example.com;
>
> The other has:
>
> server_name admin.example.com;
>
> Both do what they should. However, right now any subdomain (besides
> "admin.example.com") is the exact same as www. I would prefer if
> things were redirected so that a user cannot use
> "randomstuff.example.com" to see the website. I also don't want them
> to be able to use it without a www (e.g. example.com)
>
> Basically all requests should be directed to have the www subdomain
> (except for admin.example.com)

If I understand correctly your question, something like this should to
the trick:

server {
  listen [::]:80 default_server;
  server_name www.example.com;     
}

You can remove the default_server flag if you can guarantee that
www.example.com is the *first* one that appears inside your http
block.

--- appa