t-io Service向client发消息 400 请求报错 

@Override
	public void handler(Packet packet, ChannelContext channelContext) throws Exception {
		HelloPacket2 helloPacket = (HelloPacket2) packet;
		byte[] body = helloPacket.getBody();
		if (body != null) {
			String str = new String(body, HelloPacket2.CHARSET);
			//System.out.println("服务端收到消息：" + str);

			HelloPacket2 resppacket = new HelloPacket2();
			resppacket.setBody(("服务端收到消息:" + str).getBytes(HelloPacket2.CHARSET));
			Aio.send(channelContext, resppacket);
		}
		return;
	}