padrino-cache with sinatra

app.rb

RACK_ENV  = ENV['RACK_ENV'] ||= 'development'   unless defined?(RACK_ENV)
APP_ROOT  = File.expand_path('../..', __FILE__) unless defined?(APP_ROOT)

require 'bundler/setup'
Bundler.require(:default, RACK_ENV)

require 'padrino-core'
Padrino::IGNORE_NO_RENDERING_ENGINE = true
require 'padrino-cache'

class App < Sinatra::Base
  register Padrino::Routing
  register Padrino::Cache

  enable :caching
  enable :logging

  set :protect_from_csrf, false

  def logger
    Padrino.logger
  end

  get '/', cache: true do
    expires 10
    Time.now.to_s
  end
end

App.run!

Gemfile

source "https://rubygems.org"

gem 'sinatra', require: 'sinatra/base'
gem 'padrino-cache', require: false