# File lib/faraday_middleware/response/caching.rb, line 70
    def finalize_response(response, env)
      response = response.dup if response.frozen?
      env[:response] = response
      unless env[:response_headers]
        env.update response.env
        # FIXME: omg hax
        response.instance_variable_set('@env', env)
      end
      response
    end