title: Heroku apps automatically redirected to HTTPS
body: <p>I have a Rails 4 app, deployed on Heroku. I want my app to be served via pure HTTP, not HTTPS. So I haven't done anything special to configure HTTPS redirect (at least I think so). But nevertheless, 
  my app got a redirect to https every time I visit it. It behaves the same way in both cases, via subdomain.herokuapp.com and via my-subdomain.mydomain.tld, e.g. prepends https:// to the address. Which in turn (naturally) causes browser warnings about security. </p>
  
  <p>Can I disable such behaviour? </p>
  
  <p>By the way, mydomain.tld and www.mydomain.tld both work without this strange redirection, as well as a dummy app generated just for this purpose. </p>