public List<FilterConfig<? extends Filter>> globalFilters() {
        return Collections.singletonList(filterConfig(INVALID_REQUEST));
    }
We use a LinkedHashMap here to ensure that iterator order is the same as add order.  This is important, as the
FilterChainResolver uses iterator order when searching for a matching chain.
support/guice/src/main/java/org/apache/shiro/guice/web/ShiroWebModule.java