server_helper/util/nocache.go

package util

import (
	"net/http"
	"time"
)

var epoch = time.Unix(0, 0).Format(time.RFC1123)
var noCacheHeaders = map[string]string{
	"Expires":         epoch,
	"Cache-Control":   "no-cache, private, max-age=0",
	"Pragma":          "no-cache",
	"X-Accel-Expires": "0",
}

// NoCache writes nocache headers
func NoCache(h http.Handler) http.HandlerFunc {
	fn := func(w http.ResponseWriter, r *http.Request) {
		// Set our NoCache headers
		for k, v := range noCacheHeaders {
			w.Header().Set(k, v)
		}
		h.ServeHTTP(w, r)
	}
	return fn
}