code: func WriteTextResponse(w http.ResponseWriter, status int, body string) {
  	w.Header().Set("Content-Type", "text/plain; charset=utf-8")
  	w.Header().Set("X-Content-Type-Options", "nosniff")
  	w.WriteHeader(status)
  	w.Write([]byte(body))
  }
docs: // WriteTextResponse writes body with code status to w. The body will
  // be interpreted as plain text.