@Override
	protected void doStart() {
		if (this.messageConverter == null) {
			this.messageConverter = new NettyInboundMessageConverter(getMessageBuilderFactory());
		}
		executionHandler = new ExecutionHandler(executor);
		bootstrap = new ServerBootstrap(new NioServerSocketChannelFactory(Executors.newCachedThreadPool(),
				Executors.newCachedThreadPool()));
		bootstrap.setOption("child.tcpNoDelay", true);
		bootstrap.setPipelineFactory(new PipelineFactory());
		bootstrap.bind(new InetSocketAddress(this.port));
	}
Set the max content length; default 1Mb.
@param maxContentLength the max content length.
extensions/spring-xd-extension-http/src/main/java/org/springframework/integration/x/http/NettyHttpInboundChannelAdapter.java