无状态的故障恢复是最简单的方法，但也是作用最有限的方法，因为该方法在故障服务器与备用服务器之间没有维护任何状态。
Stateless failover is the simplest approach but also the least useful approach given that the approach maintains no state between the failed server and the backup server.
会话状态表示服务器上保持的具有有限生存期的数据，其生存期由Portlet容器进行管理。
Session state represents data that is kept on the server with a limited lifetime managed by the portlet container.
由于无线网络的有限带宽，而且多数无线网关不支持“cookie”，所以将用户会话状态从服务器端推入到客户端是不太可能的。
Due to the limited bandwidth on the wireless network and the lack of support for "cookies" in most wireless gateways, it is not possible to push the user's session state from the server to the client.
由于无线网络的有限带宽，而且多数无线网关不支持“cookie”，所以将用户会话状态从服务器端推入到客户端是不太可能的。
Due to the limited bandwidth on the wireless network and the lack of support for "cookies" in most wireless gateways, it is not possible to push the user's session state from the server to the client.
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