As cxf http-osgi transport use pax-web underlying, and pax-web use jetty underlying,
I think you can configure some jetty handlers to do so.
But with latest released apache-servicemix-4.4.0-fuse-00-27, we already have a jetty.xml in $FUSE_ESB/etc folder where you can configure jetty directly.
Thanks again Freeman for your assistance, really valuable. Will have a look at this and see if it works. We are currently on 4.3 but it's not a problem to get 4.4 running and then get the latest configuration for jetty.