call

# File actionpack/lib/action_controller/session/cookie_store.rb, line 95
      def call(env)
        env[ENV_SESSION_KEY] = AbstractStore::SessionHash.new(self, env)
        env[ENV_SESSION_OPTIONS_KEY] = @default_options.dup

        status, headers, body = @app.call(env)

        session_data = env[ENV_SESSION_KEY]
        options = env[ENV_SESSION_OPTIONS_KEY]

        if !session_data.is_a?(AbstractStore::SessionHash) || session_data.send(:loaded?) || options[:expire_after]
          session_data.send(:load!) if session_data.is_a?(AbstractStore::SessionHash) && !session_data.send(:loaded?)
          session_data = marshal(session_data.to_hash)

          raise CookieOverflow if session_data.size > MAX

          cookie = Hash.new
          cookie[:value] = session_data
          unless options[:expire_after].nil?
            cookie[:expires] = Time.now + options[:expire_after]
          end

          cookie = build_cookie(@key, cookie.merge(options))
          unless headers[HTTP_SET_COOKIE].blank?
            headers[HTTP_SET_COOKIE] << "\n#{cookie}"
          else
            headers[HTTP_SET_COOKIE] = cookie
          end
        end

        [status, headers, body]
      end