Just checked the caching headers using curl:

```
$ curl -I "http://poznan.wikia.com/wiki/W%C4%85tek:25212?action=history" -s | grep "Cache-Control"
X-Cacheable: NO:Cache-Control=private
Cache-Control: private, s-maxage=0, max-age=0, must-revalidate
```

URL is reachable, but it's not cached on Varnish. History page URL can be safely removed from purge queue.