title: Cucumber / Capybara -- how to get the host and port of the current execution
body: <p>I need to download a csv file from my app using Open::URI and to do that I need to give it a fully qualified URI.  So whats the best way to get the HOST and more importantly PORT in my cucumber script?</p>
  
  <p>Note I am using Capybara and Selenium</p>