场景：
配置jasig cas和spring security的，注销功能。tomcat报如下错误
The error indicates the the CAS server is trying to post the single sign out request to itself, localhost, rather than to the service.
原因：
注销的请求要重定向到cas serve，而不是本地application
解决：
配置SignalLogoutFilter，让注销重定向到cas server.
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