How to use better_errors in Padrino

better-errors-padrino.rb

# Gemfile
group :development do
  gem "better_errors"
  gem "binding_of_caller"
end

# config/boot.rb, after Bundler.require(:default, RACK_ENV)
if Padrino.env == :development
  require 'better_errors'
  Padrino::Application.use BetterErrors::Middleware
  BetterErrors.application_root = PADRINO_ROOT
  BetterErrors.logger = Padrino.logger
end

# config/apps.rb
set :protect_from_csrf, !(Padrino.env == :development)