change default _next in request path into something custom

What version of Next.js are you using?

12.0.4

What version of Node.js are you using?

12.22.7 / 14.17.5

What browser are you using?

Chrome

What operating system are you using?

macOS

How are you deploying your application?

Local & Docker container

Describe the Bug

The following no longer works in Next.js 12 in combination with i18n Requests for static assets return a 404.

module.exports = {
  assetPrefix: '/docs',
  rewrites() {
    return [
      { source: '/docs/_next/:path*', destination: '/_next/:path*' }
    ]
  }
}

_Originally posted by @timneutkens in https://github.com/vercel/next.js/issues/5602#issuecomment-673382891_

Expected Behavior

changes default _next in request path into something custom

To Reproduce

$ yarn create next-app --typescript

next.config.js

/** @type {import('next').NextConfig} */
module.exports = {
  reactStrictMode: true,
  i18n: {
    locales: ['nl', 'de'],
    defaultLocale: 'nl'
  },
  assetPrefix: '/docs',
  rewrites() {
    return [
      { source: '/docs/_next/:path*', destination: '/_next/:path*' }
    ]
  }
}

$ yarn build $ yarn start

Go to http://localhost:3000/, static assets are not loaded

[nmaddp1995]

Do you have any workaround for that

[teemuy]

Seems similar to the idea to make the /next/ URL prefix configurable.