worker.js

async function forwardRequest(request) {
  let targetHublet;
  if (hasApiKey(request)) {
    targetHublet = extractHubletFromApiKey(request); 
  } else if (hasOAuthToken(request)) {
    targetHublet = extractHubletFromOAuthToken(request);
  } else {
    return new Response('Request is missing auth', { status: 401 });
  }

  return fetch(request, {
    cf: { resolveOverride: `api-${targetHublet}.hubapi.com` },
  });
}

addEventListener('fetch', event => {
  event.respondWith(forwardRequest(event.request));
});