docs: @Override
      public List<GroupState> decodeContent(InputStream in, Charset charset) throws IOException {
          // 解析报文内容
          byte[] bytes = new byte[(int) getContentLength()];
          int contentSize = in.read(bytes);
          // 此处fastdfs的服务端有bug
          if (contentSize != getContentLength()) {
              try {
                  return decode(bytes, charset);
              } catch (Exception e) {
                  throw new IOException("读取到的数据长度与协议长度不符");
              }
  
          } else {
              return decode(bytes, charset);
          }
      }