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: For older versions of Edge or Internet Explorer, users have modified the AcceptLanguage key under HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\International to force these specific quality values.

The request refers to setting a language preference within a browser's Accept-Language header.

: Developers use these strings to test how their applications handle internationalization (i18n) and localization (l10n).

: If you are a developer using frameworks like Next.js, you can configure i18n locales to automatically detect these headers and serve the correct language version of your site to the user. Why this is a "Good Feature"

: By setting a high weight like 0.9, you ensure the site knows exactly which language to prioritize if multiple options are available.