public static void putGraphicalUserAuthenticationUsername(final RequestContext requestContext, final String username) {
        requestContext.getFlowScope().put("guaUsername", username);
    }
Put graphical user authentication username.

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