class Rack::TempfileReaper

def call(env)
  env[RACK_TEMPFILES] ||= []
  status, headers, body = @app.call(env)
  body_proxy = BodyProxy.new(body) do
    env[RACK_TEMPFILES].each(&:close!) unless env[RACK_TEMPFILES].nil?
  end
  [status, headers, body_proxy]
end