config.ru

begin
  require 'bundler/inline'
rescue LoadError => e
  $stderr.puts 'Bundler version 1.10 or later is required. Please update your Bundler'
  raise e
end

gemfile(true) do
  source 'https://rubygems.org'
  gem 'rails', github: 'rails/rails'
end

require 'action_controller/railtie'

class TestApp < Rails::Application
  config.root = File.dirname(__FILE__)
  config.session_store :cookie_store, key: 'cookie_store_key'
  secrets.secret_token    = 'secret_token'
  secrets.secret_key_base = 'secret_key_base'

  config.logger = Logger.new($stdout)
  Rails.logger  = config.logger

  routes.append do
    root to: 'test#index'
  end
end

STREAM_TEST_STRING = <<-EOF

Starting...

<% sleep(1) %>

1

<% sleep(1) %>

2

<% sleep(1) %>

3

<% sleep(1) %>

4

<% sleep(1) %>

5

<% sleep(1) %>

Done!

EOF

class TestController < ActionController::Base
  def index
    render inline: STREAM_TEST_STRING, stream: true
  end
end

TestApp.initialize!

run TestApp