how netty4.x acquires body: get ByteBuf through content () method and then readBytes to get byte [],
ByteBuf byteBuf = reqMsg.content();
int length = byteBuf.readableBytes();
byte[] array = new byte[length];
byteBuf.getBytes(byteBuf.readerIndex(), array);
return array;
< H2 > this way supports form forms? Json? is still supported. Or is it encapsulated by netty and supports both formats of submission? < / H2 >