- [ ] I have searched the [issues](https://github.com/apache/incubator-dubbo/issues) of this repository and believe that this is not a duplicate.
- [ ] I have checked the [FAQ](https://github.com/apache/incubator-dubbo/blob/master/FAQ.md) of this repository and believe that this is not a duplicate.

### Environment

* Dubbo version: xxx
* Operating System version: xxx
* Java version: xxx

### Steps to reproduce this issue

1. xxx
2. xxx
3. xxx

Pls. provide [GitHub address] to reproduce this issue.

### Expected Result

What do you expected from the above steps？

### Actual Result

What actually happens?

If there is an exception, please attach the exception trace:

```
Just put your stack trace here!
```

import static org.apache.dubbo.common.Constants.CONSUMERS_CATEGORY;
import static org.apache.dubbo.common.Constants.CONSUMER_PROTOCOL;
import static org.apache.dubbo.common.Constants.DEFAULT_DIRECTORY;
import static org.apache.dubbo.common.Constants.DEFAULT_REGISTER_CONSUMER_KEYS;
import static org.apache.dubbo.common.Constants.DEFAULT_REGISTER_PROVIDER_KEYS;
import static org.apache.dubbo.common.Constants.DEFAULT_REGISTRY;
import static org.apache.dubbo.common.Constants.EXPORT_KEY;
import static org.apache.dubbo.common.Constants.EXTRA_KEYS_KEY;
import static org.apache.dubbo.common.Constants.HIDE_KEY_PREFIX;
import static org.apache.dubbo.common.Constants.INTERFACES;
import static org.apache.dubbo.common.Constants.METHODS_KEY;
import static org.apache.dubbo.common.Constants.MONITOR_KEY;
import static org.apache.dubbo.common.Constants.OVERRIDE_PROTOCOL;
import static org.apache.dubbo.common.Constants.PROVIDERS_CATEGORY;
import static org.apache.dubbo.common.Constants.PROVIDER_PROTOCOL;
import static org.apache.dubbo.common.Constants.QOS_ENABLE;
import static org.apache.dubbo.common.Constants.QOS_PORT;
import static org.apache.dubbo.common.Constants.REFER_KEY;
import static org.apache.dubbo.common.Constants.REGISTER_IP_KEY;
import static org.apache.dubbo.common.Constants.REGISTER_KEY;
import static org.apache.dubbo.common.Constants.REGISTRY_KEY;
import static org.apache.dubbo.common.Constants.REGISTRY_PROTOCOL;
import static org.apache.dubbo.common.Constants.ROUTERS_CATEGORY;
import static org.apache.dubbo.common.Constants.SIMPLIFIED_KEY;
import static org.apache.dubbo.common.Constants.VALIDATION_KEY;
import static org.apache.dubbo.common.utils.UrlUtils.classifyUrls;
/**
 * RegistryProtocol
 */
public class RegistryProtocol implements Protocol {