res.redirect doesn't exist

[botv]

Hi everyone! I'm using next-connect and passport to create a callback route, but when I log res.redirect I get undefined. Passport needs res.redirect in order to work. Here's a bit of my code:

import nextConnect from 'next-connect';
import auth from '../../../../middleware/auth';
import passport from '../../../../lib/passport';

const handler = nextConnect();

handler
  .use(auth)
  .get((req, res, next) => {
    passport.authenticate('discord', {
      failureRedirect: '/',
    }, (err, user) => {
      console.log(res.redirect); // undefined
      if (err) return res.redirect('/error');
      if (!user) return res.redirect('/login');
      req.logIn(user, err => {
        if (err) return next(err);
        return res.redirect(`/`);
      });
    })(req, res, next)
  })

export default handler;

What am I doing wrong?

[IRediTOTO]

you can use this res.writeHead(303, { Location: target })
more here
https://stackoverflow.com/questions/54604505/redirecting-from-server-side-in-nextjs
but this make your sid cookie gone.