Preferred way to 301 redirect on a 404 page?

[ian]

Next.js really doesn't want you to do server side functions on your 404 page:

Error: pages/404 can not have getInitialProps/getServerSideProps, https://err.sh/next.js/404-get-initial-props

But sometimes this is preferable. In an ideal world you could add getServerSideProps to do custom 301 redirection and otherwise you can do a Router.push client side.

The behavior I'm looking for is something like:

404.js:

• /old/blog -> 301 to /blog
• /gone/page -> 404 in this case
• /* -> 301 to /

Is there a workaround to doing custom server-side response statuses for SEO reasons?