I coded in the protection (a couple of years ago) into cgminer to restrict it to the same domain name.
So stratum is allowed to redirect spv.antpool.com to badforbitcoin.antpool.com
Look's like not a big deal in case you are domain owner so you may add as many A-records as you need to DNS zone.
pool1.antpool.com = 1.1.1.1 (f2pool)
pool2.antpool.com = 2.2.2.2 (btcchina)
pool3.antpool.com = 3.3.3.3 (kano.is)
Even kind of vhosts implementation (if done) inside stratum protocol is not a solution as it is easy to bring up DNS server for this reason and spoof some zones and records.