```ruby
require 'openid/store/filesystem'

Rails.application.config.middleware.use OmniAuth::Builder do
  provider :developer unless Rails.env.production?
  provider :open_id, store: OpenID::Store::Filesystem.new('/tmp'),
           :identifier => 'https://www.google.com/accounts/o8/id'
end
```

Remove tmp-file storage provider, switch to in-memory provider.
user
```ruby
require 'openid/store/filesystem'

Rails.application.config.middleware.use OmniAuth::Builder do
  provider :developer unless Rails.env.production?
  provider :open_id, :identifier => 'https://www.google.com/accounts/o8/id'
end
```
assistant