need to require rack/session for cookies

myapp/simple.ru

@@ -1,15 +1,9 @@
 # Easiest way to run Sidekiq::Web.
 # Run with "bundle exec rackup simple.ru"
 
+require "rack/session"
 require "sidekiq/web"
 
-# A Web process always runs as client, no need to configure server
-Sidekiq.configure_client do |config|
-  config.redis = {url: "redis://localhost:6379/0", size: 1}
-end
-
-Sidekiq::Client.push("class" => "HardJob", "args" => [])
-
 # In a multi-process deployment, all Web UI instances should share
 # this secret key so they can all decode the encrypted browser cookies
 # and provide a working session.