Netty 舍弃 Http Response

Question

使用Netty作为Http Client 发送请求，添加如下Handler

pipeline.addLast(new HttpClientCodec());
pipeline.addLast(new HttpObjectAggregator(10 * 1024));

现在发现当返回体很大的时候，会触发 TooLongFrameException。
请问如何在连接不断开的情况在HttpClientCodec和HttpObjectAggregator中间加一个HttpDiscardHandler，发现Content-length大于10 * 1024时就舍弃得到的Http Response？

Answer 1

public class HttpDiscardHandler extends ChannelInboundHandlerAdapter {
    
        private boolean ignore = false;
    
        private int maxContentLength = 9 * 1024;
    
        private String body = "返回体超过" + maxContentLength + "B，已省略";
    
        @Override
        public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
            System.out.println("success!~!~");
            if (msg instanceof HttpResponse) {
                HttpResponse response = (HttpResponse) msg;
                if (Integer.valueOf(response.headers().get("Content-Length")) > maxContentLength) {
                    msg = new DefaultFullHttpResponse(response.protocolVersion(), response.status(), Unpooled.copiedBuffer(body, CharsetUtil.UTF_8));
                    ignore = true;
                }   else {
                ignore = false;
            }
                ctx.fireChannelRead(msg);
            } else {
                if (ignore) {
                    ReferenceCountUtil.release(msg);
                } else {
                    ctx.fireChannelRead(msg);
                }
            }
        }
    }