public Task toTask() {
        return new Task() {
            @Override
            public String getUUID() {
                String uuid = Site.this.getDomain();
                if (uuid == null) {
                    uuid = UUID.randomUUID().toString();
                }
                return uuid;
            }

            @Override
            public Site getSite() {
                return Site.this;
            }
        };
    }
Downloader is supposed to store response cookie.
Disable it to ignore all cookie fields and stay clean.
Warning: Set cookie will still NOT work if disableCookieManagement is true.
@param disableCookieManagement disableCookieManagement
@return this
webmagic-core/src/main/java/us/codecraft/webmagic/Site.java