If you are using an apex domain as your custom domain, we recommend also setting up a www subdomain. If you configure the correct records for each domain type through your DNS provider, {% data variables.product.prodname_pages %} will automatically create redirects between the domains. For example, if you configure www.example.com as the custom domain for your site, and you have {% data variables.product.prodname_pages %} DNS records set up for the apex and www domains, then example.com will redirect to www.example.com. If you instead configure example.com as the custom domain, then www.example.com will redirect to example.com. Automatic redirects also apply to other subdomains, as www.blog.example.com will redirect to blog.example.com or vice versa. It is not possible to configure a domain that starts with www.www..