Вы могли использовать Apache для PHP и запроса на переадресацию к Tomcat с mod_proxy_ajp. Tomcat должен затем прислушиваться к AJP на любом другом порте, чем 80 (8009, должно быть значение по умолчанию).
It does have a TLD - in this case the TLD is ac
.
This is actually a special case. Usually a TLD does not have an A record associated with it:
$ host -t A ac.
ac has address 193.223.78.210
$ host -t A com.
com has no A record
To get this behaviour, you would have to register your own TLD.
It's likely you're using a dns 'default search domain' configured most likely via DHCP or a local hosts file setting.