Problem/Motivation

Warning: Undefined array key "route:[language]=xxx:/article/*************:" in Drupal\Core\Cache\DatabaseBackend->getMultiple() (line 121 of /home/******/public_html/core/lib/Drupal/Core/Cache/DatabaseBackend.php)
#0

Steps to reproduce

1- Install Drupal 9.3.2
2- Installl the module
3- Install language module and add a secondary language
4- Make an article with translation in both format
5- Provide an alias, and then provide a new alias (Two alias see the redirection in action)
6- Browse to the first provided alias

Proposed resolution

I assume, the URL redirect in the backend has issue with content language detection. Think of this way the worn-out url path of "/article/10" redirects to the new alias "/article/something-utf-8-string", in this jump article/10 > node/10 > /article/.... not all the variables are taken into consideration at the last part when the node/nid switches to new alias.
This issue logs about 7 to 9 php-errors every time the url is visited. Also, at the same time an error logged due to page not found with regard to issue of UTF-8 character coding and decoding which is discussed here:

High number of page not found in the log file due to path encoding

CommentFileSizeAuthor
#3 php-undefined.png255.93 KBtsotoodeh
#2 php-error.jpg177.31 KBtsotoodeh

Issue fork redirect-3257559

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tsotoodeh created an issue. See original summary.

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tsotoodeh commented
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new php-error.jpg177.31 KB

Screenshot attached.

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tsotoodeh commented
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new php-undefined.png255.93 KB

The redirect function logs so many php errors in the log file on accessing the redirect pages. Below is the error:

Warning: Undefined array key "https://www.**********.com/site:" in Drupal\Core\Cache\DatabaseBackend->getMultiple() (line 121 of /home/********/public_html/core/lib/Drupal/Core/Cache/DatabaseBackend.php)
#0 /home/********/public_html/core/includes/bootstrap.inc(346): _drupal_error_handler_real(2, 'Undefined array...', '/home/********/p...', 121)
#1 /home/********/public_html/core/lib/Drupal/Core/Cache/DatabaseBackend.php(121): _drupal_error_handler(2, 'Undefined array...', '/home/********/p...', 121)
#2 /home/********/public_html/core/lib/Drupal/Core/Cache/DatabaseBackend.php(92): Drupal\Core\Cache\DatabaseBackend->getMultiple(Array, false)
#3 /home/********/public_html/core/modules/page_cache/src/StackMiddleware/PageCache.php(306): Drupal\Core\Cache\DatabaseBackend->get('https://www.per...', false)
#4 /home/********/public_html/core/modules/page_cache/src/StackMiddleware/PageCache.php(124): Drupal\page_cache\StackMiddleware\PageCache->get(Object(Symfony\Component\HttpFoundation\Request))
#5 /home/********/public_html/core/modules/page_cache/src/StackMiddleware/PageCache.php(82): Drupal\page_cache\StackMiddleware\PageCache->lookup(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#6 /home/********/public_html/core/modules/ban/src/BanMiddleware.php(50): Drupal\page_cache\StackMiddleware\PageCache->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#7 /home/********/public_html/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php(48): Drupal\ban\BanMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#8 /home/********/public_html/core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php(51): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#9 /home/********/public_html/vendor/stack/builder/src/Stack/StackedHttpKernel.php(23): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#10 /home/********/public_html/core/lib/Drupal/Core/DrupalKernel.php(708): Stack\StackedHttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#11 /home/********/public_html/index.php(19): Drupal\Core\DrupalKernel->handle(Object(Symfony\Component\HttpFoundation\Request))
#12 {main}

Lilit_Ghazaryan made their first commit to this issue’s fork.