title: Best solution for mobile app <-> Rails app authorization/authentication
body: <p>I'm current designing a Rails application that uses a form for user login, then persists session information in a cookie. However, I plan on a bulk of the interaction with the Rails application to be via a mobile app instead of a web browser.</p>
  
  <p>What is the best way to accomplish user auth? I suppose I could save a cookie with my app. Or perhaps authenticate with every request. Perhaps there's a gem for this?</p>