'Internal Server Error' when previewing from headless CraftCMS / Next.js

Support
1

Hey everyone! I’ll put as much detail as I can and thank you for anyone who helps me out :slight_smile:

The site name is https://unravelyourfood.netlify.app/ — I had headless preview working a while ago but after having had a delay in working on the site, when I try to preview using the headless url:
https://unravelyourfood.netlify.app/api it returns Internal Server Error.

I’ve tried running curl https://unravelyourfood.netlify.app/api from my local machine and it returns the same error.

Is this an issue with Netlify?

All the best,
Andrew

2

Just incase it helps to show, this is the content of my preview.js for my api route:

export default function handler(req, res) {
  if (req.query.token === null) {
    return res.status(401).json({ message: "No preview token" });
  }
  if (req.query.uri === null) {
    return res.status(401).json({ message: "No URI provided" });
  }
  res.setPreviewData(
    {
      token: req.query.token ?? null,
    },
    {
      maxAge: 60,
    }
  );
  res.redirect(`/${req.query.uri}`);
}
3
4

Thank you so much for this — it’s a shame we can’t use the latest version of Next.js but downgrading to 13.4.8 worked for me.