http/net Go no cache headers

Go no cache headers.go

package main

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

type healthModel struct {
	Message string `json:"message"`
}

func main() {
	http.Handle("/", http.FileServer(http.Dir("./www")))
	http.HandleFunc("/api/health", healthHandler)
	http.ListenAndServe(":3000", nil)
}

func healthHandler(w http.ResponseWriter, r *http.Request) {
	message := healthModel{"Hello, world!"}
	output, err := json.Marshal(message)
	if err != nil {
		fmt.Println("Json marshalling failed.")
	}
	w.Header().Set("Content-Type", "application/json")
	w.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate") // HTTP 1.1, and no-cache for IE6
	w.Header().Set("Pragma", "no-cache")                                   // HTTP 1.0 released 1997, for IE6, some robots, wget, maybe some old mobile
	w.Header().Set("Expires", "0")                                         // HTTP 1.0 proxies.
	fmt.Fprint(w, string(output))
}