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DNS servers don't allow an A record to be mapped to a CNAME. When you are using google appengine or dotcloud for hosting which doesn't give you an IP address but a CNAME, you can map to the CNAME given by your hosting provider and redirect your A record to this running code.

For example, you can run either of or on your VPS with static ip say Then you can set A the service is running on port 80)and the service will redirect it to

This is just one of the ways to redirect naked domains to www subdomain. You can redirect using your webserver as well.