Summary

We do not include a local in the MDN URLs in the Firefox release notes. The goal is for users in non-en locales following links in the release notes to be correctly redirected to their locale.
This is not working for MDN URLs and leads to a 404 in non-English locales.

URL

Example: https://developer.mozilla.org/docs/Web/API/WebCodecs_API

Reproduction steps

1. Browse in a non-en locale
2. Navigate to a MDN URL without a locale (example https://developer.mozilla.org/docs/Web/API/WebCodecs_API)

Expected behavior

There should be a redirect to your locale (example https://developer.mozilla.org/fr/docs/Web/API/WebCodecs_API)

Actual behavior

404 page

Device

Desktop

Browser

Firefox

Browser version

Stable

Operating system

Mac OS

Screenshot

No response

Anything else?

curl --header "Accept-Language: fr,fr-fr,en-us,en" -LIs https://developer.mozilla.org/docs/Web/API/WebCodecs_API | grep HTTP

Validations

• I have read the Community Participation Guidelines.
• I have verified that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• I have checked that this is a concrete bug. For Q&A open a GitHub Discussion.