Conditional redirects / default pages in getStaticProps in case of 404

[tyteen4a03]

Say I have the route setup /blog/[year]/[id]. I load the blog posts in getStaticProps. However there may be times when [year] or [id] doesn't yield any results, so in case of [id] not existing I want to redirect to /blog/[year]/1, and in case of [year] not existing I want to redirect to /blog/2020/1 (both of which I know definitely exists).

How do I do this in getStaticProps?

[enricoschaaf]

Do you deploy to vercel? If yes, the best thing would be to set up a custom 404 page for your specific directory. https://vercel.com/docs/configuration#routes/advanced/custom-404, where you redirect to [year]/1

[tyteen4a03]

Nope, I'm looking to deploy on my own server.

[enricoschaaf]

Have a look at this RFC #9081, I think that could help you in the future, for now you could use fallback: true, and just generate the first blogpost with id: 1, but that would just show the same content not redirect or send back a page that basically does a client side redirect to /1. But ideally this should be handled by your server to also send back the proper status code.