How to Create a Custom 404 Page in Joomla
The 2019 redirect-to-article trick sent 200 or 302. This 2026 guide uses Cassiopeia error-404 modules and keeps a real HTTP 404.
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Joomla how-tos · Page 5
How-tos for Joomla upgrades, cache, SEO, templates, and the fixes we use on client sites.
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