protected HttpAction handlePostLogoutResponse(final SAML2MessageContext context) {
        if (StringUtils.isNotBlank(postLogoutURL)) {
            // if custom post logout URL is present then redirect to it
            return new FoundAction(postLogoutURL);
        }
        // nothing to reply to the logout response
        return this.actionOnSuccess ? new OkAction(Pac4jConstants.EMPTY_STRING) : null;
    }
<p>handlePostLogoutResponse.</p>

@param context a {@link SAML2MessageContext} object
@return a {@link HttpAction} object
pac4j-saml/src/main/java/org/pac4j/saml/logout/processor/SAML2LogoutProcessor.java