send/receive json with golang using TLS

gistfile1.go

//client
package main

import (
	"bytes"
	"fmt"
	"io/ioutil"
	"net/http"
	"crypto/tls"
)

func main() {
	url := "https://localhost:443/api/v1/trigger"
	fmt.Println("URL:>", url)

	var jsonStr = []byte(`{"json":"on"}`)
	req, err := http.NewRequest("POST", url, bytes.NewBuffer(jsonStr))
	req.Header.Set("X-Custom-Header", "myvalue")
	req.Header.Set("Content-Type", "application/json")

	tr := &http.Transport{
        TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
    }
	client := &http.Client{Transport: tr}
	resp, err := client.Do(req)
	if err != nil {
		panic(err)
	}
	defer resp.Body.Close()

	fmt.Println("response Status:", resp.Status)
	fmt.Println("response Headers:", resp.Header)
	body, _ := ioutil.ReadAll(resp.Body)
	fmt.Println("response Body:", string(body))
}

//server

package main

import (
    // "fmt"
    // "io"
    "net/http"
    "log"
)

func HelloServer(w http.ResponseWriter, req * http.Request) {
    w.Header().Set("Content-Type", "text/plain")
    w.Write([] byte("This is an example server.\n"))
        // fmt.Fprintf(w, "This is an example server.\n")
        // io.WriteString(w, "This is an example server.\n")
}

func main() {
    http.HandleFunc("/hello", HelloServer)
    err: = http.ListenAndServeTLS(":443", "server.crt", "server.key", nil)
    if err != nil {
        log.Fatal("ListenAndServe: ", err)
    }
}