@Override
    public boolean canHandle(final HttpServletRequest request, final HttpServletResponse response) {
        return true;
    }
Process the /validate , /serviceValidate , and /proxyValidate URL requests.
<p>
Obtain the Service Ticket and Service information and present them to the CAS
validation services. Receive back an Assertion containing the user Principal
and (possibly) a chain of Proxy Principals. Store the Assertion in the Model
and chain to a View to generate the appropriate response (CAS 1, CAS 2 XML,
SAML, ...).

@author Scott Battaglia
@author Misagh Moayyed
@since 3.0.0
support/cas-server-support-validation-core/src/main/java/org/apereo/cas/web/AbstractServiceValidateController.java