for _, r := range []string{
		"bytes=0-128",
		"bytes=1-",
	} {
		rec := httptest.NewRecorder()
		req := httptest.NewRequest("GET", "/", nil)
		req.Header.Set("Range", r)
		ServeContent(rec, req, "nothing", time.Now(), bytes.NewReader(nil))
		res := rec.Result()
		if res.StatusCode != 200 {
			t.Errorf("code = %v; want 200", res.Status)
		}
		bodyLen := rec.Body.Len()
		if bodyLen != 0 {