// if any while unescaping the values.
func unescapeQueries(encodedQuery string) (unescapedQueries []string, err error) {
	for _, query := range strings.Split(encodedQuery, "&") {
		var unescapedQuery string
		unescapedQuery, err = url.QueryUnescape(query)
		if err != nil {
			return nil, err
		}
		unescapedQueries = append(unescapedQueries, unescapedQuery)
	}
	return unescapedQueries, nil
}

		encodedResource = splits[0]
		if len(splits) == 2 {
			encodedQuery = splits[1]
		}
	}

	unescapedQueries, err := unescapeQueries(encodedQuery)
	if err != nil {
		return err
	}

	// Get presigned string to sign.
	stringToSign := getStringToSignV2(req.Method, encodedResource, strings.Join(unescapedQueries, "&"), req.Header, expiresStr)
	hm := hmac.New(sha1.New, []byte(secretAccessKey))
	hm.Write([]byte(stringToSign))