@Override
    public final HttpResponse handle(com.yahoo.container.jdisc.HttpRequest request) {
        requestsInFlight.incrementAndGet();
        try {
            try {
                return handleBody(request);
            } catch (IllegalInputException e) {
                return illegalQueryResponse(request, e);
            } catch (RuntimeException e) { // Make sure we generate a valid response even on unexpected errors
                log.log(Level.WARNING, "Failed handling " + request, e);
                return internalServerErrorResponse(request, e);
            }
        } finally {
            requestsInFlight.decrementAndGet();
        }
    }
If present, responses from this will set the HTTP response header with this key to the host name of this
container-search/src/main/java/com/yahoo/search/handler/SearchHandler.java