How to share X-Request-ID between Rails frontend (ActiveResource) and backend (REST API).
```ruby
class ModelX < ActiveResource::Base
end
class ApplicationController < ActionController::Base
before_action do
ModelX.headers['X-Request-ID'] = request.uuid
end
end
```
See:
https://github.com/rails/activeresource/blob/326b452d59e8b9207069642fa6f1bf2e9b3907f1/lib/active_resource/base.rb#L322