Devise "Not found. Authentication passthru."

[igor04]

# routes.rb
devise_for :users, controllers: { omniauth_callbacks: "omniauth_callbacks" }
filter :locale

I have "Not found. Authentication passthru." message from Devise with this filter, resolved by adding exclude:

filter :locale, exclude: /^\/users\/auth/

seems like routing-filter have some conflict with Devise, that's why it is looking as omniauth callbacks isn't defined, and we have message "Not found. Authentication passthru."