title: Force Omniauth to use json for callback?
body: <p>I'm attempting to integrate Omniauth into an API written in rails, to be used by an Android application. This means that I want to be able to handle the omniauth callback with JSON.</p>
  
  <p>By default, Omniauth sends its callbacks to <code>/auth/:provider/callback</code>, is there a way that I can force Omniauth to instead send its callbacks to <code>/auth/:provider/callback.json</code>?</p>