While I navigate on mediawiki.org, I have 2 instances on this week where a page is not loading properly. Page is blank, loading, and after a long time or when I press ESC, the page loads but without most styles. After some minutes (for example the time it takes to report this bug), if I reload the page again, it works correctly.
This happened on 2018-01-05 and 2018-01-06.
I've looked at the network tab and found the URL where this happens. I've captured with curl both requests. Of course, request headers will vary between by browser request (firefox) and curl.
Since it happened to me two times on a week on different days, it seems something that should be investigated. Probably more people are affected. Note that I only visit mediawiki.org occasionally during those days, which means this may be very frequent