code: private static BinaryMemcacheRequest handleKeepAliveRequest(KeepAliveRequest msg) {
          BinaryMemcacheRequest request = new DefaultBinaryMemcacheRequest();
          request
                  .setOpcode(OP_NOOP)
                  .setKeyLength((short) 0)
                  .setExtras(Unpooled.EMPTY_BUFFER)
                  .setExtrasLength((byte) 0)
                  .setTotalBodyLength(0);
          return request;
      }
docs: Encodes a {@link KeepAliveRequest} request into a NOOP operation.
  
  @param msg the {@link KeepAliveRequest} triggering the NOOP.
  @return a ready {@link BinaryMemcacheRequest}.