[Next.js 13][Routing][Pre-fetching] Dynamic route fails to pre-fetch (404)

[Smirow]

I have already made a ticket for this, but i'm giving here some details.

Pre-fetching (with <Link> or router.prefetch()) dynamic routes like app/test/[testId]/leaf (with one segment over the dynamic param) throws a 404 Not Found on Vercel (the page exists). It works fine on next dev and next start and with other cloud providers.

You can try it here https://test-headers-vercel.vercel.app/test In the inspector you can see that pre-fetching /test/1 works as expected, pre-fetching /test/1/leaf throws a 404.

For /test/1

For /test/1/leaf (The first cache hit is a MISS, Vercel then caches it)

This forces a hard navigation to /test/1/leaf (probably related to this issue).

I haven't tried it on Next 12.

BTW: pre-fetching seems to work in dev, contrary to what is written in the beta doc

[Smirow]

You'll find the repo to reproduce here. Tested on Next 13.0.1.

[Smirow]

Strangely enough, when trying with testId=[testId], Vercel matches the corrected route (x-matched-path: /test/[testId]/leaf.rsc) and it works as expected (with testId=[testId] which is not really useful). Definitely something going on with rsc routing, like if it's missing the deprecated as= parameter.

[Smirow]

To help the investigation, rewriting the url in middleware.ts with the same url seems to fix the issue on Vercel:

return NextResponse.rewrite(new URL(request.nextUrl.pathname, request.url));

[Smirow]

@timneutkens thanks for the transfer, but to be clear and as mentioned, as far as my testing goes, this behavior is only replicable on Vercel.

[timneutkens]

Still falls under our team's work, we'll investigate 👍

[ijjk]

Hi, this should be corrected now, please re-deploy your project and give it a try!

[Smirow]

Thanks @ijjk ! Working as expected.

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