[0] https://www.jwz.org/blog/2016/04/i-would-like-debian-to-stop...
http://nullrefer.com/?https://www.jwz.org/blog/2016/04/i-wou...
It would be pretty amusing if HN put in a special case to use this for links to jwz.org.
BTW if you use https, i.e. https://nullrefer.com/?http://www.xhaus.com/headers there won't be any Referer at all, while http://nullrefer.com/?http://www.xhaus.com/headers will show nullrefer.com as the referrer.
(To anyone complaining that they need referrers: Use cases that require the referrer can find another solution. As the jwz.org redirect indicates, referrers leak important information. Do you really want to argue that your use case is so important that it justifies a data leak?)