netty - 支持 httpstaticfileserverhandler 示例中的 "Transfer-Encoding:chunked"

Question

我需要能够使用分 block 编码来模拟 http 响应。 Netty 是能够在高负载下模拟强大可扩展性的明显选择。但是，当响应 header 包含 header 时
Transfer-Encoding: chunked
请求客户端收到响应 header ，但从未收到任何内容。

从演示响应 HTTPS 的 Netty 示例中，我将其稍微更改为

 if (ch.getPipeline().get(SslHandler.class) != null || response.getHeader("Transfer-Encoding").equals("chunked")) 
 {
    writeFuture = ch.write(new ChunkedFile(raf, 0, fileLength, 8192));
 } else {
    use FileRegion ....
 }

 if (!isKeepAlive(req)) {
   outboundFuture.addListener(ChannelFutureListener.CLOSE);
 }

因此，我希望 chunkedFile 由 ChunkedWriteHandler 处理，并且响应可以毫无问题地发送，但我可能会忽略一些东西。

管道匹配 netty 示例中的处理程序和顺序

 pipeline.addLast("decoder", new HttpRequestDecoder());
 pipeline.addLast("aggregator", new HttpChunkAggregator(65536));
 pipeline.addLast("encoder", new HttpResponseEncoder());
 pipeline.addLast("chunkedWriter", new ChunkedWriteHandler());

 pipeline.addLast("handler", new Handler());

网络堆栈跟踪:

java.io.IOException: An existing connection was forcibly closed by the remote host
    at sun.nio.ch.SocketDispatcher.write0(Native Method)
    at sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:33)
    at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:72)
    at sun.nio.ch.IOUtil.write(IOUtil.java:28)
    at sun.nio.ch.SocketChannelImpl.write(SocketChannelImpl.java:334)
    at org.jboss.netty.channel.socket.nio.SocketSendBufferPool$PooledSendBuffer.transferTo(SocketSendBufferPool.java:241)
    at org.jboss.netty.channel.socket.nio.AbstractNioWorker.write0(AbstractNioWorker.java:476)
    at org.jboss.netty.channel.socket.nio.AbstractNioWorker.writeFromUserCode(AbstractNioWorker.java:426)
    at org.jboss.netty.channel.socket.nio.NioServerSocketPipelineSink.handleAcceptedSocket(NioServerSocketPipelineSink.java:127)
    at org.jboss.netty.channel.socket.nio.NioServerSocketPipelineSink.eventSunk(NioServerSocketPipelineSink.java:66)
    at org.jboss.netty.handler.codec.oneone.OneToOneEncoder.handleDownstream(OneToOneEncoder.java:63)
    at org.jboss.netty.channel.Channels.write(Channels.java:733)
    at org.jboss.netty.handler.stream.ChunkedWriteHandler.flush(ChunkedWriteHandler.java:276)
    at org.jboss.netty.handler.stream.ChunkedWriteHandler.handleDownstream(ChunkedWriteHandler.java:120)
    at org.jboss.netty.channel.Channels.write(Channels.java:712)
    at org.jboss.netty.channel.Channels.write(Channels.java:679)
    at org.jboss.netty.channel.AbstractChannel.write(AbstractChannel.java:245)
    at nettyexample.Handler.messageReceived(Handler.java:93)
    at org.jboss.netty.handler.stream.ChunkedWriteHandler.handleUpstream(ChunkedWriteHandler.java:141)
    at org.jboss.netty.handler.codec.http.HttpChunkAggregator.messageReceived(HttpChunkAggregator.java:111)
    at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:296)
    at org.jboss.netty.handler.codec.replay.ReplayingDecoder.unfoldAndFireMessageReceived(ReplayingDecoder.java:600)
    at org.jboss.netty.handler.codec.replay.ReplayingDecoder.callDecode(ReplayingDecoder.java:584)
    at org.jboss.netty.handler.codec.replay.ReplayingDecoder.messageReceived(ReplayingDecoder.java:445)
    at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268)
    at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255)
    at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:94)
    at org.jboss.netty.channel.socket.nio.AbstractNioWorker.processSelectedKeys(AbstractNioWorker.java:372)
    at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:246)
    at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:38)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:662)
java.nio.channels.ClosedChannelException
    at org.jboss.netty.handler.stream.ChunkedWriteHandler.discard(ChunkedWriteHandler.java:168)
    at org.jboss.netty.handler.stream.ChunkedWriteHandler.flush(ChunkedWriteHandler.java:287)
    at org.jboss.netty.handler.stream.ChunkedWriteHandler.handleDownstream(ChunkedWriteHandler.java:120)
    at org.jboss.netty.channel.Channels.write(Channels.java:712)
    at org.jboss.netty.channel.Channels.write(Channels.java:679)
    at org.jboss.netty.channel.AbstractChannel.write(AbstractChannel.java:245)
    at nettyexample.Handler.messageReceived(Handler.java:93)
    at org.jboss.netty.handler.stream.ChunkedWriteHandler.handleUpstream(ChunkedWriteHandler.java:141)
    at org.jboss.netty.handler.codec.http.HttpChunkAggregator.messageReceived(HttpChunkAggregator.java:111)
    at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:296)
    at org.jboss.netty.handler.codec.replay.ReplayingDecoder.unfoldAndFireMessageReceived(ReplayingDecoder.java:600)
    at org.jboss.netty.handler.codec.replay.ReplayingDecoder.callDecode(ReplayingDecoder.java:584)
    at org.jboss.netty.handler.codec.replay.ReplayingDecoder.messageReceived(ReplayingDecoder.java:445)
    at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:268)
    at org.jboss.netty.channel.Channels.fireMessageReceived(Channels.java:255)
    at org.jboss.netty.channel.socket.nio.NioWorker.read(NioWorker.java:94)
    at org.jboss.netty.channel.socket.nio.AbstractNioWorker.processSelectedKeys(AbstractNioWorker.java:372)
    at org.jboss.netty.channel.socket.nio.AbstractNioWorker.run(AbstractNioWorker.java:246)
    at org.jboss.netty.channel.socket.nio.NioWorker.run(NioWorker.java:38)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:662)

Answer 1

看看这个线程:How to use ChunkedStream properly

引用回复...

发送任意分 block 数据时，必须先发送一个新的 DefaultHttpResponse(仅限一次):

HttpResponse res = new DefaultHttpResponse();
res.setChunked(true);
res.setHeader(Names.TRANSFER_ENCODING, Values.CHUNKED);
channel.write(res);

然后，只要您想使用任意 block 写入 channel ，请调用:

HttpChunk chunk = new DefaultHttpChunk(ChannelBuffers.wrappedBuffer(str.getBytes(CharsetUtil.UTF_8)));
channel.write(chunk);

确保您拥有 setChunked在 HttpResponse目的。