Getting empty response body from Verify about go-iap HOT 2 CLOSED

// Verify sends receipts and gets validation result
func (c *Client) Verify(req IAPRequest, result interface{}) error {
    b := new(bytes.Buffer)
    json.NewEncoder(b).Encode(req)

    request, _ := http.NewRequest("POST", c.URL, b)

    resp, err := http.DefaultClient.Do(request)
    defer resp.Body.Close()

    if err != nil {
        return err
    }

    err = json.NewDecoder(resp.Body).Decode(result)

    return err
}