定义一个函数包裹Handler，返回HandleFunc，然后通过ResponseWriter修改Header。
func changeHeaderThenServe(h http.Handler) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
// Set some header.
w.Header().Add("Keep-Alive", "300")
// Serve with the actual handler.
h.ServeHTTP(w, r)
}
}
通过FilServer访问静态资源。
func main() {
h := http.FileServer(http.Dir("static/"))
h = http.StripPrefix("/static/", h)
http.HandleFunc("/static/", changeHeaderThenServe(h))
http.ListenAndServe("localhost:80", nil)
}
参考： Google Groups
