SSL/https setup for herokuapp.com address rather than my actual domain

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http://serverfault.com – I have a subdomain of my site pointed to a rails app at mysite.herokuapp.com. I bought a certificate from godaddy and seem to have that all set up correctly. So that when I go to: http://mysite.herokuapp.com or http://dev.mysite.com it's redirected to: https://mysite.herokuapp.com or https://dev.mysite.com The problem is that when I visit dev.mysite.com, I get the error: Safari can't verify the identity of the website. But when I go to mysite.herokuapp.com, I don't get the error. I wanted this to be set up the other way, so that dev.mysite.com did not cause the error. I'm not sure where (HowTos)