JSONRPC服务器返回空结果

I've coded a simple JSONRPC server to test Go's capabilities, but I'm stuck, always getting an empty result, without error and correct id. I've got the following Go code: package main

import (
    "log"
    "net"
    "net/rpc"
    "net/rpc/jsonrpc"
)

type Experiment int

func (e *Experiment) Test(i *string, reply *string) error {
    s := "Hello, " + *i
    reply = &s
    log.Println(s, reply)
    return nil
}

func main() {
    exp := new(Experiment)
    server := rpc.NewServer()
    server.Register(exp)
    l, err := net.Listen("tcp", ":1234")
    if err != nil {
        log.Fatal("listen error:", err)
    }
    for {
        conn, err := l.Accept()
        if err != nil {
            log.Fatal(err)
        }
        server.ServeCodec(jsonrpc.NewServerCodec(conn))
    }
}

No matter what I tried, I've always got the following response:

{"id":1,"result":"","error":null}

Logging shows everything is working as it should in the server.

2013/07/17 15:17:13 Hello, Paulo 0xc200090ac0

Any ideas on what's going on? I'm using the latest stable version of Go, v1.1.1

Thanks

Your reply is of type pointer to string. That is okay and even required as the second argument is used to return the answer. But then you do:

s := "Hello, " + *i
reply = &s

Which translates to:

• Construct a new string with a new value.
• Let reply point to this new string

This lets the string which is returned completely unaffected. Try

*reply = s