code: function ServerError(message, status, cause) {
      ServerError.super_.call(this, message, status || StatusCode.SERVER_ERROR, cause);
  }
docs: abstract superclass for HTTP client error(5xx).
  
  @param {String} [message]
  @param {int} [status]
  @param {*} [cause]
  @constructor
  @abstract
  @memberOf errors