private void addRequest(Request request) {
        if (site.getDomain() == null && request != null && request.getUrl() != null) {
            site.setDomain(UrlUtils.getDomain(request.getUrl()));
        }
        scheduler.push(request, this);
    }
Process specific urls without url discovering.

@param urls urls to process
webmagic-core/src/main/java/us/codecraft/webmagic/Spider.java