Rewrite fallback isn't executed when getStaticProps returns notFound

[vetalstar]

What version of Next.js are you using?

12.0.1

What version of Node.js are you using?

16.13.0

What browser are you using?

Chrome

What operating system are you using?

macOS

How are you deploying your application?

npm run dev

Describe the Bug

next.config.js

async rewrites() {
        return {
            afterFiles: [
                {
                    source: '/:path(.*)',
                    has: [
                        {
                            type: 'host',
                            value: '(?<host>.*)',
                        },
                    ],
                    destination: '/_hosts/:host/:path*',
                },
            ],
            fallback: [
                {
                    source: '/:path(.*)',
                    has: [
                        {
                            type: 'host',
                            value: '(?<host>.*)',
                        },
                    ],
                    destination: '/_hosts/:host/404',
                },
            ],
        }
    },

_hosts/[host]/catalog/[category].tsx

export const getStaticProps: GetStaticProps = async ({params}) => {
    const data: PropsQueryResponse = await request(process.env.API_URL, propsQuery, variables)

    if (!data.category) {
        return {
            notFound: true,
        }
    }

    return {
        props: {
            ...data,
        },
        revalidate: 60,
    }
}

export const getStaticPaths: GetStaticPaths = async () => {
    const data: PathsQueryResponse = await request(process.env.API_URL, pathsQuery)

    return {
        paths: [
           { params: { ... } }
        ],
        fallback: 'blocking',
    }
}

Also I have custom 404 page _hosts/[host]/404.tsx

When I return notFound, fallback rewrites aren't executed. So I can't rewrite pages with dynamic routes to the custom 404 page

Expected Behavior

Fallback rewrites should be executed when dynamic routes are not found

To Reproduce

N/A

[ijjk]

Hi, rewrites are not meant to be triggered when returning notFound: true currently. I'm going to close this as a duplicate of https://github.com/vercel/next.js/issues/26883

[vetalstar]

@ijjk is there any way to set a custom path to 404 page? As I had showed I have 404 page in the subfolder: _hosts/[host]/404.tsx

[ijjk]

Nested 404 pages are not currently available, you can conditionally render on the client based on the props returned from getStaticProps instead though.

[vetalstar]

I see. I've done so. Thank you

[balazsorban44]

This issue has been automatically locked due to no recent activity. If you are running into a similar issue, please create a new issue with the steps to reproduce. Thank you.