[BUG] Normal request somehow getting "purpose = prefetch" header

[murbanowicz]

Initially I thought it is about build,but found out it is not.

I am trying to move to Cloudflare with OpenNext.
I am using Kinde for auth (working great on Vercel).
Unfortunately, as they have a check for prefetch on login handler (other routes work ok) - https://github.com/kinde-oss/kinde-auth-nextjs/blob/main/src/handlers/login.ts#L12

After adding many debug logs in node_modules code, I managed to find out that in some way, when the request hit the handler, it has "purpose = prefetch" header set, which cause the handler to think it is prefetch and return null.

I was trying to figure out what is going on, but I cannot find any reason how this can happen.

Above you can find a screenshot from my debugging attempt.

  console.log('isPreFetch - purpose', e.get("purpose") === "prefetch");
  console.log('isPreFetch - x-purpose', e.get("x-purpose") === "prefetch");
  console.log('isPreFetch - x-moz', e.get("x-moz") === "prefetch");

  return !!(e.get("purpose") === "prefetch" || e.get("x-purpose") === "prefetch" || e.get("x-moz") === "prefetch");
}
export {
  r as isPreFetch
};

dead simple logs put inside node_modules.

Any idea what can be going on here?

[conico974]

This is caused by this https://github.com/opennextjs/opennextjs-aws/blob/73281c958d43d865fdded0d5d86dd82747365fee/packages/open-next/src/core/requestHandler.ts#L159-L164

We could move this to use a code patch now

[murbanowicz]

Thanks Mate for jumping in.
What would you recommend to unblock myself? I do not know ON enough to contribute at this moment.

[conico974]

For now use something like pnpm patch to remove these lines https://github.com/kinde-oss/kinde-auth-nextjs/blob/d221023de87008ca1115ab2bcf9598ba79106df9/src/handlers/login.ts#L12-L14.
I'll make a patch for it early next week