code: function ProxyHttp(options) {
      ProxyAbstract.call(this, options);
      this._server = options.server || 'https://api.smsapi.pl/';
      this._auth = options.auth || null;
  }
docs: proxy for http server
  @param {Object}                 [options]
  @param {String}                 [options.server] url to the server
  @param {AuthenticationAbstract} [options.auth] authentication object