golang http json response sample [Super-easy JSON HTTP responses, in Go](http://nesv.blogspot.jp/2012/09/super-easy-json-http-responses-in-go.html)

http_json_response.go

package main

import (
	"encoding/json"
	"fmt"
	"net/http"
)

type Response map[string]interface{}

func (r Response) String() string {
	b, err := json.Marshal(r)
	if err != nil {
		s := ""
		return s
	}
	s := string(b)
	return s
}

func DefaultHandler(w http.ResponseWriter, r *http.Request) {
	fmt.Fprintf(w, "Hello, HTTP!!!")
}

func SeeYouHandler(w http.ResponseWriter, r *http.Request) {
	name := r.FormValue("name")
	fmt.Fprintf(w, "See you, %s!!!", name)
}

func JsonHandler(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "application/json")
	fmt.Fprint(w, Response{"success": true, "message": "Hello!"})
	return
}

func main() {
	http.HandleFunc("/", DefaultHandler)
	http.HandleFunc("/seeyou", SeeYouHandler)
	http.HandleFunc("/json", JsonHandler)
	http.ListenAndServe(":8080", nil)
}