Url property

Implementation

String get Url {
  var url_params = <String>[];
  var url_base = this.url;
  if (this.param.isNotEmpty) {
    this.param.forEach((k, v) {
      url_params.add("${k}=${v}");
    });
    final url_string = url_params.join("&");
    if (url_string.isNotEmpty) {
      url_base = "${url_base}?${url_string}";
    }
  }
  return url_base;
}