unsupported message type: DefaultFullHttpResponse (expected: ByteBuf, FileRegion) 原因以及解决办法

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本文详细解析了使用Netty构建HTTP服务器时，因HttpObjectAggregator顺序不当导致的连接问题。通过调整HttpObjectAggregator在管道中的位置，解决了Android客户端链接时出现的错误。文章提供了正确的代码示例，确保服务器能正确处理HTTP请求。

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使用netty做http服务器的时候用android链接会出现这个错误

原因是http-aggregator顺序有问题

(ps:目前大部分国内博客都是这个排序有点坑爹):

官方文档说明:For convenience, consider putting a HttpServerCodec before the HttpObjectAggregator as it functions as both a HttpRequestDecoder and a HttpResponseEncoder.

package com.sencorsta.ids.httptest;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpRequestDecoder;
import io.netty.handler.codec.http.HttpResponseEncoder;
import io.netty.handler.stream.ChunkedWriteHandler;

/**
 * Created by apple on 17/10/21.
 */
public class HttpServer {

	public static void start(final int port) throws Exception {
		EventLoopGroup boss = new NioEventLoopGroup();
		EventLoopGroup woker = new NioEventLoopGroup();
		ServerBootstrap serverBootstrap = new ServerBootstrap();
		HttpServerHandler httpServerHandler=new HttpServerHandler();
		try {

			serverBootstrap.channel(NioServerSocketChannel.class).group(boss, woker)
					.childOption(ChannelOption.SO_KEEPALIVE, true).option(ChannelOption.SO_BACKLOG, 1024)
					.childHandler(new ChannelInitializer<SocketChannel>() {
						@Override
						protected void initChannel(SocketChannel ch) throws Exception {
							ch.pipeline().addLast("http-decoder", new HttpRequestDecoder());      
                            ch.pipeline().addLast("http-aggregator", new HttpObjectAggregator(65536));//这里的位置有问题
							ch.pipeline().addLast("http-encoder", new HttpResponseEncoder());
							ch.pipeline().addLast("http-chunked", new ChunkedWriteHandler());
							ch.pipeline().addLast(httpServerHandler);
						}
					});

			ChannelFuture future = serverBootstrap.bind(port).sync();
			future.channel().closeFuture().sync();
		} finally {
			boss.shutdownGracefully();
			woker.shutdownGracefully();
		}
	}

	public static void main(String[] args) throws Exception {
		start(8080);
	}
}

把上面的ch.pipeline().addLast("http-aggregator", new HttpObjectAggregator(65536));这一行

放到coder下面就可以了

package com.sencorsta.ids.httptest;

import io.netty.bootstrap.ServerBootstrap;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioServerSocketChannel;
import io.netty.handler.codec.http.HttpObjectAggregator;
import io.netty.handler.codec.http.HttpRequestDecoder;
import io.netty.handler.codec.http.HttpResponseEncoder;
import io.netty.handler.stream.ChunkedWriteHandler;

/**
 * Created by apple on 17/10/21.
 */
public class HttpServer {

	public static void start(final int port) throws Exception {
		EventLoopGroup boss = new NioEventLoopGroup();
		EventLoopGroup woker = new NioEventLoopGroup();
		ServerBootstrap serverBootstrap = new ServerBootstrap();
		HttpServerHandler httpServerHandler=new HttpServerHandler();
		try {

			serverBootstrap.channel(NioServerSocketChannel.class).group(boss, woker)
					.childOption(ChannelOption.SO_KEEPALIVE, true).option(ChannelOption.SO_BACKLOG, 1024)
					.childHandler(new ChannelInitializer<SocketChannel>() {
						@Override
						protected void initChannel(SocketChannel ch) throws Exception {
							ch.pipeline().addLast("http-decoder", new HttpRequestDecoder());
							ch.pipeline().addLast("http-encoder", new HttpResponseEncoder());
							ch.pipeline().addLast("http-aggregator", new HttpObjectAggregator(65536));
							ch.pipeline().addLast("http-chunked", new ChunkedWriteHandler());
							ch.pipeline().addLast(httpServerHandler);
						}
					});

			ChannelFuture future = serverBootstrap.bind(port).sync();
			future.channel().closeFuture().sync();
		} finally {
			boss.shutdownGracefully();
			woker.shutdownGracefully();
		}
	}

	public static void main(String[] args) throws Exception {
		start(8080);
	}
}

参考资料:官方说明

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