private boolean isMessageBodyReadyForFilter(ZuulFilter<I, O> filter, I inMesg) {
        return inMesg.hasCompleteBody() || !filter.needsBodyBuffered(inMesg);
    }
This is typically set by a filter when wanting to reject a request and also reduce load on the server by
 not processing anymore filterChain
zuul-core/src/main/java/com/netflix/zuul/netty/filter/BaseZuulFilterRunner.java