@Override
    protected Mono<Void> handleSelectorIfNull(final String pluginName, final ServerWebExchange exchange, final ShenyuPluginChain chain) {
        return doExecute(exchange, chain, null, null);
    }
use waf plugin we can control some access.
shenyu-plugin/shenyu-plugin-waf/src/main/java/org/apache/shenyu/plugin/waf/WafPlugin.java