从httpstaticfileserverhandler示例中支持“Transfer-Encoding:块”

Question

我需要能够模拟带有块编码的http响应。Netty是能够在高负载下模拟较强可伸缩性的明显选择。但是，当响应标头由报头组成时

Transfer-Encoding: chunked

请求客户端接收响应头，但从不接收任何内容。

在Netty示例中，它演示了对HTTPS的响应，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，我期望chunkedFile由ChunkedWriteHandler来处理，并且没有问题地发送响应，但我可能忽略了一些东西。

管道与netty示例中的处理程序和顺序匹配。

 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());

Netty Stack Trace：

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

引用回应..。

在发送任意块数据时，必须首先发送一个新的DefaultHttpResponse (只发送一次)：

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

然后，每当您想要用任意块写入通道时，请调用：

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

确保在setChunked对象上有HttpResponse。