response json raw message

rawjson.go

package main

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

type TestJson struct {
	//Str is json string
	Str json.RawMessage `json:"str"`
}

func main() {
	http.HandleFunc("/foo", fooHandler)
	log.Fatal(http.ListenAndServe(":8080", nil))
}

func fooHandler(w http.ResponseWriter, r *http.Request) {
	// data is json
	// {
	//		"number": 1,
	//		"text": "hello"
	// }
	data := "{\"number\":1,\"text\":\"hello\"}"

	buf := TestJson{
		Str: []byte(data),
	}
	body, err := json.Marshal(&buf)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	w.Header().Set("Content-Type", "application/json")
	w.Write(body)
}