cf-pages-proxy

_worker.js

export default {
  async fetch(request, env) {
    const url = new URL(request.url);
    if (url.pathname.startsWith('/')) {
      url.hostname = env.PROXY_URL;
      const new_request = new Request(url, request);
      return fetch(new_request);
    }
    return env.ASSETS.fetch(request);
  },
};