protected AuraContext startContext(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException,
ServletException {
HttpServletRequest request = (HttpServletRequest) req;
Format f = format.get(request);
Authentication a = access.get(request, Authentication.AUTHENTICATED);
Map<String, Object> configMap = getConfigMap(request);
Mode m = getMode(request, configMap);
boolean d = getDebugToolParam(request);