public static void putGraphicalUserAuthenticationEnabled(final RequestContext requestContext, final Boolean value) {
        requestContext.getFlowScope().put("guaEnabled", value);
    }
Put graphical user authentication enabled.

@param requestContext the request context
@param value          the value
core/cas-server-core-web-api/src/main/java/org/apereo/cas/web/support/WebUtils.java