```java
if (REGISTRY_PROTOCOL.equals(url.getProtocol())) {
urls.add(url.addParameterAndEncoded(REFER_KEY,
StringUtils.toQueryString(map)));
} else {
urls.add(ClusterUtils.mergeUrl(url, map));
}
```
See org.apache.dubbo.rpc.cluster.support.ClusterUtils#mergeUrl.
If no registry was set,
I have a demo locally. It works fine.
Do you have a demo git repository link?
[ Full content available at: https://github.com/apache/dubbo/issues/5041 ]
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