link-stack/apps/link/pages/api/proxy/[[...path]].ts

import { NextApiRequest, NextApiResponse } from 'next';
import { createProxyMiddleware } from 'http-proxy-middleware';
import { getToken } from "next-auth/jwt";

const withAuthInfo =
  (handler) => async (req: NextApiRequest, res: NextApiResponse) => {
    const session = await getToken({
      req,
      secret: process.env.NEXTAUTH_SECRET,
    });

    if (!session) {
      return res.redirect("/login");
    }

    if (req.headers) {
      req.headers['X-Forwarded-User'] = session.email.toLowerCase();
      req.headers['host'] = 'zammad.example.com';
    }

    return handler(req, res);
  };

const proxy = createProxyMiddleware({
  target: process.env.ZAMMAD_URL,
  changeOrigin: true,
  xfwd: true,
  ws: false,
  pathRewrite: { "^/zammad": "" },
});

export default withAuthInfo(proxy);

export const config = {
  api: {
    bodyParser: false,
    externalResolver: true,
  },
};