You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: unauthenticated_session_expiry.rb
    path of file: ./repos/gitlabhq/lib/gitlab/middleware
    
    the code of the file until where you have to start completion: # frozen_string_lite
    
      def call(env)
        result = @app.call(env)

        warden = env['warden']
        user = catch(:warden) { warden && warden.user } # rubocop:disable Cop/BanCatchThrow -- ignore Warden errors since we're outside Warden::Manager

        unless user
          # This works because Rack uses these options every time a request is handled, and redis-store
          # uses the Rack setting first:
          # 1. https://github.com/rack/rack/blob/fdcd03a3c5a1c51d1f96fc97f9dfa1a9deac0c77/lib/rack/session/abstract/id.rb#L342
          # 2. https://github.com/redis-store/redis-store/blob/3acfa95f4eb6260c714fdb00a3d84be8eedc13b2/lib/redis/store/ttl.rb#L32
          env['rack.session.options'][:expire_after] = Settings.gitlab['unauthenticated_session_expire_delay']
        end