public static String getLogoutPostUrl(final RequestContext requestContext) {
        return requestContext.getFlowScope().get("logoutPostUrl", String.class);
    }
Get the logout POST url from the flow scope.

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