How to handle relative URL's

[SKB-CGN]

Hi,
i found this project and thought, it would help me, to get a small (reverse) proxy, to catch up a full HTML site from an external resource, to avoid the first pain with CORS.

I used this example to start:

https://dev.to/decker67/write-your-own-cors-proxy-with-nodejs-in-no-time-30f9

const express = require('express')
const cors = require('cors')
const { createProxyMiddleware } = require('http-proxy-middleware')

const app = express()
app.use(cors())
app.use(createProxyMiddleware({
  router: (req) => new URL(req.path.substring(1)),
  pathRewrite: (path, req) => (new URL(req.path.substring(1))).pathname,
  changeOrigin: true,
  logger: console
}))

app.listen(8088, () => {
  console.info('proxy server is running on port 8088')
})

When i now attach a website, which has full paths for styles, images and so on, its working flawless - if they are relative, they are not being converted.
Does anybody perhaps know, how to deal with that?

Thanks!