Skipping Rack::Cache for authenticated users

application.rb

# ...
  config.middleware.insert_before "Rack::Cache", "SkipCache"
# ...

skip_cache.rb

class SkipCache
  def initialize(app)
    @app = app
  end

  def call(env)
    request = Rack::Request.new(env)

    if request.cookies["your_authenticated_cookie_name"]
      env["rack-cache.force-pass"] = true
    end

    @app.call(env)
  end
end

Does this work when multithreading is turned on (e.g. if we are using Puma)?