How to redirect to a url

I would like to show client another page after data has been collected from previous page. But I have trouble redirect the new URL on the server side. Here is my logic:

  1. submit user input with POST action to server;
  2. server run function saveChoice() to save user input into a database;
  3. After user input is saved, server send a new URL to client;
  4. By the time the client GET the new URL, server reads the database and get saved data out

And I am stuck on step 3 (here is an example of the flow):

type Stuff struct{
    List []string
}

func checkcheck(w http.ResponseWriter, r *http.Request) {
    sinfo := Stuff{
        List: some_slice
    }

    t, err := template.New("").Parse(tpl_ds)
    checkErr(err)
    err = r.ParseForm()
    checkErr(err)
    err = t.Execute(w, sinfo)
    checkErr(err)

    if r.Method == "POST" {
        saveChoice(r.Form["choices"])
        /* step 3: make user open another URL */
    }
}

And here is the template:

<html>
<script>
  $(function () {
    $('form').on('submit', function (e) {
      e.preventDefault();
      $.ajax({
        type: 'post',
        data: $('form').serialize(),
      });
    });
  });
</script>
<body>
  <form method="POST">
    {{range .List}}
        <input type="checkbox" name="choices" value="{{.}}"> <span>{{.}}</span><br>
    {{end}}
    <input type="submit" value="Submit">
  </form>
</body>
</html>

May I know how I can redirect to a new page?

p.s. If I put URL on button, then server is not going to run saveChoice()