str := "aabb,&8?%s"
    ret := url.QueryEscape(str)
    log.Println(ret)

    encodedValue := "Hell%C3%B6+W%C3%B6rld%40Golang"
    decodedValue, err := url.QueryUnescape(encodedValue)
    log.Println(decodedValue, err)

2021/08/14 11:35:12 aabb%2C%268%3F%25s
2021/08/14 11:35:13 Hell? W?rld@Golang <nil>