title: what's my host on cloud9 IDE?
body: <p>I'm following along the hartl rails tutorial book and I'm making a mailer. I'm on the email previews portion right now, and there's this bit of code:</p>
  
  <pre><code>    config.action_mailer.raise_delivery_errors = true
      config.action_mailer.delivery_method = :test
      host = 'example.com'
      config.action_mailer.default_url_options = { host: host }
  
  inside config/environments/development.rb
  </code></pre>
  
  <p>The instructions say change it to be like <code>host = 'rails-tutorial-c9-mhartl.c9.io'</code> but with your own name. I've changed it to rails-tutorial-iylin.c9.io but it's not working (if my name is iylin, shouldn't it be working?). I've found this <a href="https://stackoverflow.com/questions/27931929/c9-io-how-to-find-the-host-address-to-make-a-mysql-connection-in-node-js-platf">c9.io - how to find the host address to make a mysql connection in node.js platform</a> but the top answer there doesn't work either.</p>