private void rpcContext(final ServerWebExchange exchange) {
        Map<String, Map<String, String>> rpcContext = exchange.getAttribute(Constants.GENERAL_CONTEXT);
        Optional.ofNullable(rpcContext)
                .map(context -> context.get(PluginEnum.DUBBO.getName()))
                .ifPresent(this::transmitRpcContext);
    }
plugin is execute.
if return true this plugin can not execute.

@param exchange the current server exchange
@return default false.
shenyu-plugin/shenyu-plugin-proxy/shenyu-plugin-rpc/shenyu-plugin-dubbo/shenyu-plugin-dubbo-common/src/main/java/org/apache/shenyu/plugin/dubbo/common/AbstractDubboPlugin.java