HTTPS client with CA certificate in Go

client.go

package main

import (
	"crypto/tls"
	"crypto/x509"
	"io/ioutil"
	"log"
	"net/http"
)

func main() {
	tlsConfig := &tls.Config{
		InsecureSkipVerify: false,
		RootCAs:            x509.NewCertPool(),
	}
	b, err := ioutil.ReadFile("ca.crt")
	if err != nil {
		log.Fatalf("Could not read the CA certificate: %s", err)
	}
	if tlsConfig.RootCAs.AppendCertsFromPEM(b) != true {
		log.Fatalf("Could not load the CA certificate: %s", err)
	}

	client := &http.Client{Transport: &http.Transport{TLSClientConfig: tlsConfig}}
	r, err := client.Get("https://localhost:9000/")
	if err != nil {
		log.Fatal(err)
	}
	log.Printf("StatusCode=%v", r.StatusCode)
}