Golang中的HTTP请求如何附加cert.pem和key.pem？

cert, err := ioutil.ReadFile("cert.pem")
if err != nil {
    log.Fatal(err)
}

key, err := ioutil.ReadFile("key.pem")
if err != nil {
    log.Fatal(err)
}

tlsConfig := &tls.Config{
    Certificates: []tls.Certificate{
        tls.Certificate{
            Certificate: [][]byte{cert},
            PrivateKey:  key,
        },
    },
}

transport := &http.Transport{
    TLSClientConfig: tlsConfig,
}

client := &http.Client{
    Transport: transport,
}

resp, err := client.Get("https://example.com")
if err != nil {
    log.Fatal(err)
}
defer resp.Body.Close()

body, err := ioutil.ReadAll(resp.Body)
if err != nil {
    log.Fatal(err)
}

fmt.Println(string(body))