原因：
ticket验证失败,验证结果信息：<cas:serviceResponse xmlns:cas="http://www.yale.edu/tp/cas">
<cas:authenticationFailure>ticket格式错误,接收到的ticket:ST-599220-UeDVUudhHsMSaaZmyD6t-cas01.example.org</cas:authenticationFailure>
</cas:serviceResponse>