When the language switcher block is rendered for 404 pages an interesting thing happens. Without big_pipe enabled we get links to system/404 - so we get links to pages which are a 200 response but with 404 content. With big_pipe enabled and a logged-in user we get links to the front page. This is because only the sub-request has the correct routing information.
Once 🐛 [regression] Language switcher block throws exception when no route is matched Fixed run \Drupal\Tests\language\Functional\LanguageSwitchingTest::testLanguageBlock()
Not sure. But the fact that system/401, system/403, system/404 and system/4xx are all valid URLs on a Drupal site is very odd. If you hit them directly they all return a 200 response.
Needs review
10.1 ✨
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Here's a variation of #22 which only swaps the routing information for the main request if it doesn't already have some.
For me this fixes Drupal\Tests\system\Functional\System\AccessDeniedTest
The last submitted patch, 3: 3349201.patch, failed testing. View results →