docs.html

<script>
  addEventListener("fetch", (event) => {
  event.respondWith(handleRequest(event.request));
});

async function handleRequest(request) {
  try {
    const urlObject = new URL(request.url);
    // If the request is to the docs subdirectory
    if (/^\/docs/.test(urlObject.pathname)) {
      // Then Proxy to Mintlify
      const DOCS_URL = "velocity-3fbe0540.mintlify.dev";
      const CUSTOM_URL = "learnvelocity.pages.dev";

      let url = new URL(request.url);
      url.hostname = DOCS_URL;

      let proxyRequest = new Request(url, request);

      proxyRequest.headers.set("Host", DOCS_URL);
      proxyRequest.headers.set("X-Forwarded-Host", CUSTOM_URL);
      proxyRequest.headers.set("X-Forwarded-Proto", "https");

      return await fetch(proxyRequest);
    }
  } catch (error) {
    // if no action found, play the regular request
    return await fetch(request);
  }

  return await fetch(request);
}
</script>