public Cas20ProxyReceivingTicketValidationFilter getCas20ProxyReceivingTicketValidationFilter() {
    Cas20ProxyReceivingTicketValidationFilter cas20ProxyReceivingTicketValidationFilter = new Cas20ProxyReceivingTicketValidationFilter();
    cas20ProxyReceivingTicketValidationFilter.setServerName(serverUrl);
    cas20ProxyReceivingTicketValidationFilter.setTicketValidator(new Cas20ServiceTicketValidator(casServerUrlPrefix));
    cas20ProxyReceivingTicketValidationFilter.setRedirectAfterValidation(true);
    return cas20ProxyReceivingTicketValidationFilter;
}