Go functions don't seem to work correctly for wildcard routes

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1

Given a Go function called /api/[...path].go, all requests like /api/login, /api/user, etc. are routed correctly and handled by the function.

Alas, all routes three levels deep (/api/user/verify, /api/shizzle/{id}) instantly return a 404. They do not even show up in the logs.

In that regard, it looks like the platform handles Go functions with a wildcard name [...path] as if it was named just [path].

This looks like a bug to me.

2

There’s another community post with 404 debugging tips that might be helpful. Please give these solutions a try and let us know how it goes.

A human should be around soon to offer more advice. But you can also get helpful information quickly by asking v0.

5

Thanks for reporting, I can reproduce this. I’ll share this internally

6

Thanks @jacobparis, please keep me updated about the status of this issue!

7

Hey @jacobparis, any update on this? Is there any known workaround we can use for the time being? Would a custom Docker-based runtime or something like this work?

8

Oh my, the solution is simply to use rewrites.

In my case, it was as simple as just renaming the function handler to /api/index.go and configuring this in vercel.json:

{
  "rewrites": [
    {
      "source": "/api/(.*)",
      "destination": "/api/index.go"
    }
  ]
}

Alas, the documentation is not very clear about this. I did not expect to be able to specify the filename of a function as destination, but apparently this works and the request still contains the originally requested path, so the request handler can correcly dispatch based on it.

9

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