@Override
    public HttpMessage prepareLogoutHttpMessageToSend(final SingleLogoutRequestContext request, final SingleLogoutMessage logoutMessage) {
        return new LogoutHttpMessage(CasProtocolConstants.PARAMETER_LOGOUT_REQUEST, request.getLogoutUrl(), logoutMessage.getPayload(), this.asynchronous);
    }
This is {@link BaseSingleLogoutServiceMessageHandler}.

@author Misagh Moayyed
@since 6.0.0
core/cas-server-core-logout-api/src/main/java/org/apereo/cas/logout/slo/BaseSingleLogoutServiceMessageHandler.java