gistfile1.rb

# config/routes.rb

get '/:country/welcome' => 'welcome#show'


# app/controllers/welcome_controller.rb

class WelcomeController < ApplicationController
  around_filter :set_preferred_locale
  
  private
  
  def set_preferred_locale
    I18n.locale = header_locale || params.fetch(:country, I18n.default_locale)
  end
  
  def header_locale
    headers['Accept-Language']
  end
end