private static String getConnectionHeader(CompleteEvent completeEvt) {
        HttpResponse response = completeEvt.getResponse();
        if (response != null) {
            return response.headers().get(HttpHeaderNames.CONNECTION);
        }

        return null;
    }
User: michaels@netflix.com
Date: 6/23/16
Time: 1:57 PM
zuul-core/src/main/java/com/netflix/zuul/netty/connectionpool/ConnectionPoolHandler.java