I'm attempting to make SiteMesh3 an asynchronous filter so that it will
work with Jetty's asynchronous ProxyServlet.Transparent proxy. Everything
appears to work until the SiteMesh filter hands off to Jetty - specifically
in ServletHandler.doFilter(). The NullPointerException happens on the first
line of that method (line 1628 for jetty-proxy 9.2.1.v20140609). When I
debug into it I see that the request is *not* an instance of Request, and
HttpChannel.getCurrentHttpChannel() is null, which is why it throws a NPE
when trying to call getRequest().

My question is this - is there any way for me to initialize or setup
HttpChannel, or is that completely outside of what I should be doing when I
use the Jetty proxy? Thanks so much for your help.

        @Override
        public void doFilter(ServletRequest request, ServletResponse response)
            throws IOException, ServletException
        {
            final Request baseRequest=(request instanceof
Request)?((Request)request):HttpChannel.getCurrentHttpChannel().getRequest();
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