public static void putGraphicalUserAuthenticationImage(final RequestContext requestContext, final String image) {
        requestContext.getFlowScope().put("guaUserImage", image);
    }
Put graphical user authentication image.

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