将protobuf与golang结合使用并处理[] byte HTTP响应正文

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)