Stop Devise from going to sign_in page after session timeout From https://github.com/plataformatec/devise/wiki/How-To:-Do-not-redirect-to-login-page-after-session-timeout

devise_sign_in_stop

In config/initializers/devise.rb configure your custom failure app:

config.warden do |manager|
  manager.failure_app = CustomFailureApp
end
And in lib/custom_failure_app.rb:

class CustomFailureApp < Devise::FailureApp
  def redirect
    message = warden.message || warden_options[:message]
    if message == :timeout     
      redirect_to attempted_path
    else 
      super
    end
  end
end