safetwitch/server/routes/proxy/proxyRoute.ts

import { Router, Response, Request, NextFunction } from 'express'

const proxyRouter = Router();

proxyRouter.get('/img', async (req: Request, res: Response, next: NextFunction) => {
    const imageUrl = req.query.imageUrl?.toString()
    if(!imageUrl) return;

    fetch(imageUrl).then((response) => {
        response.body!.pipeTo(
          new WritableStream({
            start() {
              response.headers.forEach((v, n) => res.setHeader(n, v));
            },
            write(chunk) {
              res.write(chunk);
            },
            close() {
              res.end();
            },
          })
        );
      })
      .catch((err) => next(err))
})

export default proxyRouter