code: HttpData toHttpData(DataBuffer dataBuffer) {
          if (dataBuffer instanceof NettyDataBuffer) {
              return new ByteBufHttpData(((NettyDataBuffer) dataBuffer).getNativeBuffer(), false);
          }
          if (dataBuffer instanceof DefaultDataBuffer) {
              return new ByteBufHttpData(
                      Unpooled.wrappedBuffer(((DefaultDataBuffer) dataBuffer).getNativeBuffer()), false);
          }
          return new ByteBufHttpData(Unpooled.wrappedBuffer(dataBuffer.asByteBuffer()), false);
      }
docs: Converts a {@link DataBuffer} into an {@link HttpData}.