Use 301 for default-locale redirects

[pettinarip]

Description

Converts 307→301 when pathname starts with /${DEFAULT_LOCALE}.

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[wackerow]

/en or /en/ -> / showing 301 (Moved Permanently) for me

/es -redirects-to-> /es/ and shows as 308 (Permanent Redirect)

This (308) passes the SEO ranking along, so I think this is fine (ref: https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Status/308)

[wackerow]

Lgtm, thanks @pettinarip

[Kentomarine]

// Example middleware for logging requests
function requestLogger(req, res, next) {
console.log(${req.method} ${req.url});
next(); // Call the next middleware
}