export default function handler(req, res) {
    res.status(200).json({ message: 'Hello from Next.js!' })
  }

I copied this simple snippet from the site to test whether the api routing would work out and it doesn't.

I get the following error:

 ⨯ app\socket.io\page.js (2:8) @ status
 ⨯ TypeError: Cannot read properties of undefined (reading 'status')
    at handler (./app/socket.io/page.js:6:9)
    at stringify (<anonymous>)
digest: "3268381246"
  1 | export default function handler(req, res) {
> 2 |     res.status(200).json({ message: 'Hello from Next.js!' })
    |        ^
  3 |   }

I try to access it like this:

socketRef.current = io();

Which then comes to /socket.io/?EIO=4....
Which should work as far as I know.