I have SJS Web Proxy Server set up only to multihost for glassfish. Based on the url pattern, it redirects from the standard ports (80, 4848) to specific ports for a given GF domain. It works fine, except every once in a while, the browser comes back saying "Bad request, Your browser sent a query this server could not understand." I've seen this both on GET and POST requests, both normal and ajax based. I never had this problem until the proxy was put in the line.
My complete obj.conf (I'm not using the proxy for anything else):