When checking http headers against what is defined in produces in a route, the DefaultRoute.java class doesn't appear to take q=x into consideration. For example, an accept header can look like so:
Accept: application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,/;q=0.5

A good reference: http://www.gethifi.com/blog/browser-rest-http-accept-headers