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我正在扩展使用Spring Webflow 2.4.1和Spring 4.1.8构建的应用程序（Jasig CAS）。我注意到，当我离开一段时间回来时，流程将继续执行。它不超时。春季webflow不闲置超时？它恢复？
我认为，空闲超时后，流程将使用户回到起点，因为会话被销毁，流程执行键将会丢失，并且HTTP会话中存储的变量也会丢失。但是，显然情况并非如此。
有人可以帮我理解为什么流量不会超时？而且，在HTTP会话被销毁之后，它是如何获得流程执行键和流变量的呢？
这是我看到的日志。请注意，流程正在恢复并且流量变量已恢复，这可能是为什么流量可以继续运行。
2016-07-26 16:10:17,688 DEBUG [org.springframework.webflow.mvc.servlet.FlowHandlerMapping] - Mapping request with URI '/cas/login' to flow with id 'login'
2016-07-26 16:10:17,689 DEBUG [org.springframework.webflow.executor.FlowExecutorImpl] - Resuming flow execution with key 'c5317d47-5330-4189-971f-......(key omitted)
2016-07-26 16:10:17,710 DEBUG [org.springframework.webflow.definition.registry.FlowDefinitionRegistryImpl] - Getting FlowDefinition with id 'login'
2016-07-26 16:10:17,710 DEBUG [org.springframework.webflow.engine.impl.FlowExecutionImpl] - Resuming in [email protected]149
2016-07-26 16:10:17,710 DEBUG [org.springframework.webflow.engine.Flow] - Restoring [[email protected] name = 'credential', valueFactory = [[email protected] type = UsernamePasswordCredential]]
2016-07-26 16:10:17,711 DEBUG [org.springframework.webflow.engine.Flow] - Restoring [[email protected] name = 'changePassword', valueFactory = [[email protected] type = ChangePasswordCredential]]
2016-07-26 16:10:17,711 DEBUG [org.springframework.webflow.engine.Flow] - Restoring [[email protected]d name = 'changeEmail', valueFactory = [[email protected] type = ChangeEmailAddress]]
2016-07-26 16:10:17,711 DEBUG [org.springframework.webflow.engine.Flow] - Restoring [[email protected] name = 'changeSecretQuestion', valueFactory = [[email protected] type = ChangeSecretQuestion]]
2016-07-26 16:10:17,712 DEBUG [org.springframework.webflow.mvc.view.AbstractMvcView] - Processing user event 'submit'