DMwangnima opened a new issue, #2517:
URL: https://github.com/apache/dubbo-go/issues/2517
### Environment
- Server: Dubbo-go, v3.1.0
- Client: Dubbo-go, v3.1.0
- Protocol: Dubbo
### Issue description
<!-- Here is a brief description about the issue. -->
#### defining API
```go
type UserProvider struct {
Echo func(ctx context.Context, req *int32) (*int32, error)
}
```
#### client logic
```
resp, err := cli.Echo(context.Background(), (*int32)(nil))
```
#### dubbo-go-hessian2
<img width="873" alt="image"
src="https://github.com/apache/dubbo-go/assets/33331974/13d14ee5-ef33-45ba-aa4e-982e88d5631d";>
Judging ```v == nil``` is not enough since ```(*int32)(nil)``` has type
information.
#### dubbo-go
/protocol/dubbo/impl/hessian.go
<img width="761" alt="image"
src="https://github.com/apache/dubbo-go/assets/33331974/21f11321-348a-4c84-b0b5-9f5c4795be68";>
ignore encoding error does not make any sense.
### Logs
<details><summary>Click me to check logs</summary>
```
Copy logs to here.
```
</details>
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