if err != nil { ... }

    // Read results from the stream
    err = stream.Results(func(resp *Resp) error {
        fmt.Println("Got result", resp)
        // Return the response for reuse
		instance.PutResponse(resp)
        return nil
    })
```

There are handlers for requests with:
 * No input stream: `RegisterNoInput`.
 * No initial payload: `RegisterNoPayload`.