title: not recognized cas ticket
body: <p>I have a REST api in my web application where I get cas ticket generated by another webapp.  </p>
  
  <p>That webapp intern use <code>cas20proxyticketvalidator</code> to validate the ticket. Therefore, I also use <code>Cas20ProxyTicketValidator</code> in my custom filter to validate the ticket.  </p>
  
  <p>But it always give me following error:</p>
  
  <pre><code>ticket = ST-148008-jWXKeEdHkxmuktvYqXF6-cas
  org.jasig.cas.client.validation.TicketValidationException:
                  ticket 'ST-148008-jWXKeEdHkxmuktvYqXF6-cas' not recognized
  
          at org.jasig.cas.client.validation.Cas20ServiceTicketValidator.parseResponseFromServer(Cas20ServiceTicketValidat
  or.java:86)
          at org.jasig.cas.client.validation.AbstractUrlBasedTicketValidator.validate(AbstractUrlBasedTicketValidator.java
  :217)
  </code></pre>
  
  <p>Why my ticket is not recognized?</p>