_worker.js

addEventListener('fetch', event => {
  event.respondWith(handleRequest(event.request))
})
async function handleRequest(request) {
  const url = new URL(request.url);
  const actualUrlStr = url.pathname.replace("/proxy/", "") + url.search + url.hash
  const actualUrl = new URL(actualUrlStr)
  const modifiedRequest = new Request(actualUrl, {
    headers: request.headers,
    method: request.method,
    body: request.body,
    redirect: 'follow'
  });
  const response = await fetch(modifiedRequest);
  const modifiedResponse = new Response(response.body, response);
  modifiedResponse.headers.set('Access-Control-Allow-Origin', '*');
  return modifiedResponse;
}