whitekeyboard commented on issue #1100:
URL: https://github.com/apache/dubbo-go/issues/1100#issuecomment-806302521
补充一下：
dubbo协议的Refer函数会返回nil，导致上述的panic
```
// Refer create dubbo service reference.
func (dp *DubboProtocol) Refer(url *common.URL) protocol.Invoker {
exchangeClient := getExchangeClient(url)
if exchangeClient == nil {
logger.Warnf("can't dial the server: %+v", url.Location)
return nil
}
invoker := NewDubboInvoker(url, exchangeClient)
dp.SetInvokers(invoker)
logger.Infof("Refer service: %s", url.String())
return invoker
}
```
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