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.
所有使用WSDL发布的操作都是无状态的，它在消息实例间没有相关性。
All operations exposed using WSDL are stateless. It doesn't have a feature of correlating between message instances.
当服务请求没有与之前或之后的请求的隐含相关关系时，就使用无状态范围。
The stateless scope is used when service requests have no implied correlation with prior and future requests.
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