Using protobuf with golang and handling []byte HTTP response body - go

Question

I am using the Golang protobuf package and try to write some tests to ensure my API works properly.
I construct an Object on the server-side with a generated .pb.go file.
And return it with
data, err := proto.Marshal(p)
fmt.Fprint(w, data)
And in my test I do
func TestGetProduct(t *testing.T) {
log.Println("Starting server")
go startAPITestServer()
time.Sleep(0 * time.Second)
log.Println("Server started")
//rq, err := http.NewRequest("GET", "localhost:8181/product/1", nil)
client := &http.Client{}
log.Println("Starting Request")
resp, err := client.Get("http://localhost:8181/product/1")
log.Println("Finished Request")
if err != nil {
t.Log(err)
}
defer resp.Body.Close()
log.Println("Reading Request")
data, err := ioutil.ReadAll(resp.Body)
log.Println("Reading finished")
if err != nil {
t.Log(err)
}
log.Println("HTTP Resp", data)
p := &Product{}
proto.UnmarshalText(string(data), p)
proto.Unmarshal(data, p2)
}
The Problem is that the HTTP Request is correct and displays the []byte correctly, but if I do ioutil.ReadAll it interprets the HTTP Response as a string and converts it to a []byte.
For example the response is
[12 3 2 14 41]
Then ioutil.ReadAll interprets this as a string and not as a []byte.

Answer 1

The problem was: I tried to write binary data to the output stream with fmt.Fprint missing the important fact, that the fmt package converts (everything?) input to a "read-able" format (ie strings).
The correct way of writting data into the output of your HTTP Response is using the responsewriter directly like this:
k, err := w.Write(data)