public static void putLogoutPostUrl(final RequestContext requestContext, final String postUrl) {
        requestContext.getFlowScope().put("logoutPostUrl", postUrl);
    }
Put the logout POST url in the flow scope.

@param requestContext the flow context
@param postUrl        the POST url
core/cas-server-core-web-api/src/main/java/org/apereo/cas/web/support/WebUtils.java