Go: rpc request returns empty

Ok I have a rpc server package and a rpc client package.
I'd like to ask the server to return all domains.

In server.go I import server.DomainServer and serve it over http.

In client.go I import client.DomainClient and send a rpc call to the listening server.

The response is empty [].

The expected response is ["dom1.de","dom2.de"]

Why is the response empty? How can I debug this?

Do I have to share the GetAllDomainsRequest and GetAllDomainsRequest struct so they have the same type, e.g. in a package called common?

Update: Ran wireshark to capture the response, and the response was, amongst other stuff, []string

server.go

package main

import (
	"log"
	"net/http"
	"net/rpc"

	"bitbucket.org/idalu/hostd/server"
)

func main() {
	var authkey = "123"
	ds := &server.DomainServer{
		Authkey: authkey,
	}

	rpc.Register(ds)
	rpc.HandleHTTP()
	log.Fatalln(http.ListenAndServe(":1312", nil))
}

server/domain.go

package server

import (
	"errors"
	"fmt"
)

type DomainServer struct {
	Authkey string
}

type GetAllDomainsRequest struct {
	Authkey string
}

type GetAllDomainsResponse struct {
	Domains []string
}

func (s *DomainServer) GetAllDomains(req GetAllDomainsRequest, rsp *GetAllDomainsResponse) error {
	if req.Authkey != s.Authkey {
		return errors.New("forbidden")
	}
	rsp = &GetAllDomainsResponse{
		Domains: []string{"dom1.de", "dom2.de"},
	}
	fmt.Println(rsp)
	return nil
}

client.go

package main

import (
	"log"

	"bitbucket.org/idalu/hostd/client"
)

func main() {
	dc := &client.DomainClient{
		Authkey:    "123",
		ServerAddr: "127.0.0.1:1312",
	}
	if e := dc.GetAllDomains(); e != nil {
		log.Fatalln(e.Error())
	}
}

client/domain.go

package client

import (
	"fmt"
	"net/rpc"
)

type DomainClient struct {
	ServerAddr string
	Authkey    string
}

type GetAllDomainsRequest struct {
	Authkey string
}

type GetAllDomainsResponse struct {
	Domains []string
}

func (c *DomainClient) GetAllDomains() error {
	client, e := rpc.DialHTTP("tcp", c.ServerAddr)
	if e != nil {
		return e
	}
	req := GetAllDomainsRequest{
		Authkey: c.Authkey,
	}
	rsp := GetAllDomainsResponse{}
	if e := client.Call("DomainServer.GetAllDomains", req, &rsp); e != nil {
		return e
	}
	fmt.Println(rsp.Domains)
	return nil
}

The bug is in server/domain.go

rsp = &GetAllDomainsResponse{
    Domains: []string{"dom1.de", "dom2.de"},
}

where you are not updating the response value provided during the call but assign a new one to your local variable. It should be something like

rsp.Domains = []string{"dom1.de", "dom2.de"}