[12:29:52] Is there a reason this page comes up on benign errors like a 404 on domains like upload.wikimedia.org? https://gerrit.wikimedia.org/g/operations/puppet/+/fc9d220b54a4e45cb356e507d0c6d0e127a492c2/modules/mediawiki/templates/errorpage.html.erb [12:30:58] For example, https://upload.wikimedia.org/wikipedia/en/thumb/foobar [12:31:38] Or a better example: https://upload.wikimedia.org/wikipedia/en/thumb/8/86/Rail_map_of_China_(high_speed_highlighted)_WP.svg/1200px-Rail_map_of_China_(high_speed_highlighted)_WP.svg.png [12:43:09] Looks like https://gerrit.wikimedia.org/g/mediawiki/vagrant/+/3f87cc4297d5f8d6d1587109e8194e3e2dfc918e/puppet/modules/varnish/templates/default-subs.vcl.erb#154 is the branch for this? [15:14:11] perryprog: are they valid files? [15:14:31] No clue. The point is there's a 5xx-like error page for a 404 error [15:14:38] That branch just means show error page if backend sent one [15:14:43] perryprog: it's not a 404 [15:14:45] It's 400 [15:14:54] look at the "better example" link I sent [15:15:22] but that page will show if the backend returns higher than a 400 code and it's not otherwise got an error I think [15:16:00] Right; I'm just wondering why that is [15:16:18] So you don't get a white screen instead [15:16:32] The first one doesn't look a valid path [15:16:37] Which is why it's a bad request [15:16:50] I'm guessing the second just doesn't exist [15:19:07] perryprog: ^ [15:19:25] Yes. The issue is that it's giving a "server is on fire" like message. [15:19:36] "Our servers are currently under maintenance or experiencing a technical problem. Please try again in a few minutes." makes no sense for a 404 [15:20:04] perryprog: wikimedia error pages are nonsense [15:20:33] indeed, cause we never have errors [15:21:46] Wikimedia/mediawiki and helpful, informative error pages has never happened [15:21:50] Reedy: that too :)