apollo 的重试规则

在开发时能够借鉴

//post,delete,put请求在admin server处理超时状况下不重试
  private boolean canRetry(Throwable e, HttpMethod method) {
    Throwable nestedException = e.getCause();
    if (method == HttpMethod.GET) {
      return nestedException instanceof SocketTimeoutException
             || nestedException instanceof HttpHostConnectException
             || nestedException instanceof ConnectTimeoutException;
    } else {
      return nestedException instanceof HttpHostConnectException
             || nestedException instanceof ConnectTimeoutException;
    }
  }