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Fix RTD language switcher redirecting to nonexistent /en/4.x/ branch #11349

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Oct 10, 2025
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Fix RTD language switcher redirecting to nonexistent /en/4.x/ branch #11349

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9 changes: 9 additions & 0 deletions 404.rst
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Expand Up @@ -24,6 +24,15 @@ Page not found
</p>

<script>
// If we were redirected to `/en/4.x/` as a result of the RTD language selector,
// redirect to `/en/stable/` instead, as English does not have a `4.x` branch.
// (For maintenance reasons, non-English languages have a single `4.x` branch
// that is the counterpart of `4.3`, `4.4`, `4.5`, and so on.)
if (window.location.pathname.includes('/en/4.x/')) {
const newUrl = window.location.pathname.replace('/en/4.x/', '/en/stable/');
window.location.replace(newUrl);
}

// Check for redirects if on a currently invalid page.
// This is done in JavaScript, as we exceed Read the Docs' limit for the amount of redirects configurable.
// When testing this feature on a local web server, replace the URL below with just `/_static/redirects.csv`.
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