gistfile1.java

 @Override
    public void messageReceived(ChannelHandlerContext ctx, MessageEvent event) {
        HttpRequest httpRequest = (HttpRequest) event.getMessage();
        logger.debug("Request: {}", httpRequest);

        QueryStringDecoder qs = new QueryStringDecoder(httpRequest.getUri());

        final Request request = new Request(ctx, httpRequest, qs);
        final Response response = new Response(ctx, httpRequest);

        try {
            execBeforeFilters(request, response);
            execHttpMethod(request, response);
            execAfterFilters(request, response);
        } catch (HttpException e) {
            HttpResponse httpResponse = new DefaultHttpResponse(HttpVersion.HTTP_1_1, e.getStatus());
            ctx.getChannel().write(httpResponse).addListener(ChannelFutureListener.CLOSE);
        } catch (Exception e) {
            HttpResponse httpResponse = new DefaultHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.INTERNAL_SERVER_ERROR);
            if (logger.isDebugEnabled()) {
                ChannelBuffer channelBuffer = ChannelBuffers.dynamicBuffer();
                PrintWriter printWriter = new PrintWriter(new ChannelBufferOutputStream(channelBuffer));
                e.printStackTrace(printWriter);
                printWriter.close();
                httpResponse.setContent(channelBuffer);
            }
            logger.error("web server error: ", e);
            ctx.getChannel().write(httpResponse).addListener(ChannelFutureListener.CLOSE);
        }
    }