h2o_ip_acl_sample.rb

ALLOW_IPS = %w{                                                                                                          
192.168.1.1                                                                                                              
}

class Acl
  def call(env)
    if ALLOW_IPS.include? env['REMOTE_ADDR']
      [399, {}, []]
    else
      [403, {'Content-Type' => 'text/plain;charset=utf-8'}, ['Forbidden']]
    end
  rescue => e
    $stderr.puts e
  end
end

Acl.new