Client side caching for net/http using rack/client and rack/cache

gistfile1.rb

require "rack/client"
require "rack/cache"
require "rack/test"

app = Rack::Builder.new {
  use Rack::Cache,
    :verbose     => true,
    :metastore   => "heap:/",
    :entitystore => "heap:/"
  run Rack::Client
}

client = Rack::MockRequest.new(app)

2.times {
  puts client.get("http://redbot.org/")["X-Rack-Cache"]
}

# outputs:
# miss, store
# fresh