How to respond to a DuckDB request – identified by the fairly rare user agent 'cpp-httplib' – in a Rails controller, returning a database file in the `public` folder.

DuckDbHandlingRailsController.rb

class HomeController < ApplicationController
  def index
    # Intercept DuckDB requests
    if request.user_agent =~ /cpp-httplib/
      send_file(Rails.root.join('public', 'public_lists.db'), 
        type: 'application/octet-stream', 
        disposition: 'attachment')
      return
    end
    # Handle non-DuckDB requests...
  end
end