title: Devise, OmniAuth & Facebook: "Not found. Authentication passthru."
body: <p>Trying to follow along with <a href="https://github.com/plataformatec/devise/wiki/OmniAuth:-Overview">https://github.com/plataformatec/devise/wiki/OmniAuth:-Overview</a> and I'm stumped. </p>
  
  <p>I've got <code>config.omniauth :facebook, ENV['FB_APP_ID'], ENV['FB_APP_SECRET']</code> in my config/initializers/devise.rb, <code>devise_for :users, :controllers =&gt; { :omniauth_callbacks =&gt; "users/omniauth_callbacks" }</code> in my routes.rb, and an OmniAuthCallbacks controller defined. </p>
  
  <p>When I visit <code>user_omniauth_authorize_path(:facebook)</code>, I get:
  <code>Not found. Authentication passthru.</code> I'm not sure what to do next. I am not using route globing, so I don't believe I need to define a passthru method, but doing so just gives me a 404.</p>