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Add NEXT_LOCALE cookie note to docs (#20045)

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Closes: https://github.com/vercel/next.js/issues/20044
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JJ Kasper 2020-12-09 16:45:05 -06:00 committed by GitHub
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6
docs/advanced-features/i18n-routing.md
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@ -214,6 +214,12 @@ export default function IndexPage(props) {
}
```
## Leveraging the NEXT_LOCALE cookie
Next.js supports overriding the accept-language header with a `NEXT_LOCALE=the-locale` cookie. This cookie can be set using a language switcher and then when a user comes back to the site it will leverage the locale specified in the cookie.
For example, if a user prefers the locale `fr` but a `NEXT_LOCALE=en` cookie is set the `en` locale will be used instead until the cookie is removed or expired.
## Search Engine Optimization
Since Next.js knows what language the user is visiting it will automatically add the `lang` attribute to the `<html>` tag.