Can you access hackersays.heroku.com?
$ nslookup hackersays.com ;; Got SERVFAIL reply from 75.75.75.75, trying next server Server: 75.75.75.75 Address: 75.75.75.75#53 ** server can't find hackersays.com: NXDOMAIN
$ nslookup hackersays.heroku.com Server: 75.75.75.75 Address: 75.75.75.75#53 Non-authoritative answer: hackersays.heroku.com canonical name = proxy.heroku.com. Name: proxy.heroku.com Address: 174.129.23.129 Name: proxy.heroku.com Address: 107.21.99.190 Name: proxy.heroku.com Address: 107.21.95.3 Name: proxy.heroku.com Address: 174.129.20.208