- [ ] 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!
```

return false;
        }
        return channel.isConnected();
    }
    @Override
    public Object getAttribute(String key) {
        Channel channel = getChannel();
        if (channel == null) {
            return null;
        }
        return channel.getAttribute(key);
    }
    @Override
    public void setAttribute(String key, Object value) {
        Channel channel = getChannel();
        if (channel == null) {
            return;
        }
        channel.setAttribute(key, value);
    }
    @Override
    public void removeAttribute(String key) {
        Channel channel = getChannel();
        if (channel == null) {
            return;
        }
        channel.removeAttribute(key);
    }
    @Override
    public boolean hasAttribute(String key) {