func upload(w http.ResponseWriter, r *http.Request) {

    if r.Method == "GET" {
        t := template.New("xx")
        t, err := t.Parse(html)

        if err != nil {
            log.Fatalf("failed to update template: %s", err)
        }

    }
    if r.Method == "POST" {
        err := r.ParseMultipartForm(1024 * 65)

        if err != nil {

            fmt.Println(err)
            return
        }

        // ... gathering data, doing stuff ...

        data := processData()
        // TODO: pass data to use it in the result page

        http.Redirect(w, r, "/result", http.StatusSeeOther)

    }