@Override
    public boolean canHandle(final Credential credential) {
        return true;
    }
Proxy Handler to handle the default callback functionality of CAS 2.0.
<p>
The default behavior as defined in the CAS 2 Specification is to callback the
URL provided and give it a pgtIou and a pgtId.
</p>

@author Scott Battaglia
@since 3.0.0
core/cas-server-core-tickets-api/src/main/java/org/apereo/cas/ticket/proxy/support/Cas20ProxyHandler.java