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

import { createProxyMiddleware } from "http-proxy-middleware";
import { NextApiRequest, NextApiResponse } from "next";

const proxy = createProxyMiddleware({
    target: process.env.ZAMMAD_URL,
    changeOrigin: true,
    xfwd: false,
    pathRewrite: { '^/zammad': '' },
    onProxyReq: (proxyReq, req: NextApiRequest) => {
        proxyReq.setHeader('X-Forwarded-User', "");
    }
});

export default proxy;

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