help required chaining httphandler and proxyhandler

[rzorzorzo]

hello,

i am trying to implement a proxy which checks the http requests before
forwarding these to another server.
i tried implementing this with the following pipeline

starthandler -> HttpRequestDecoder-> stophandler ->
HexDumpProxyInboundHandler

starthandler:

remembers the incoming bytes in a dynamic buffer until the httprequest has
been completely parsed

   @Override
	 public void messageReceived(ChannelHandlerContext ctx, MessageEvent evt)
throws Exception
	 {
		 ChannelBuffer m = (ChannelBuffer) evt.getMessage();
		 ChannelBuffer buf = (ChannelBuffer) ctx.getAttachment();
		 if (buf == null)
		 {
			 buf = dynamicBuffer();
			 ctx.setAttachment(buf);
		 }
		 m.markReaderIndex();
		 buf.writeBytes(m);
		 m.resetReaderIndex();
	     super.messageReceived(ctx, evt);
	    }

stophandler


		    @Override
			 public void messageReceived(ChannelHandlerContext ctx, MessageEvent evt)
{
				 if (isOk((HttpRequest)evt.getMessage()))
				 {
					 ChannelBuffer buf = (ChannelBuffer)
ctx.getPipeline().getContext("interceptStart").getAttachment();
					ctx.sendUpstream(new UpstreamMessageEvent(evt.getChannel(), buf,
evt.getRemoteAddress()));

				 }
			    }

both extend simple channel upstream handler and
@ChannelPipelineCoverage("one")

for the first page this seems to work well, but for subsequent http requests
not.

any hints or help or other ideas how to implement this with netty ?

- Ron

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