Renaming Downloaded Files

In this example, the modification of the Content-Disposition in the response headers achieves the modification of the downloaded file name according to the fileName parameter in the request URL.

Code

async function handleRequest(request) {
  const url = new URL(request.url);
  const fileName = url.searchParams.get('fileName');

  const response = await fetch(request);

  // Evaluate the response status code and the search parameter
  if (response.status !== 200 || !fileName) {
    return response;
  }

  // Modify the Content-Disposition response header
  response.headers.append('Content-Disposition', `attachment; filename="${fileName}"`);
  return response;
}

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

Preview

Enter a URL (such as https://example.com/origin.exe?fileName=modified.exe) that matches the trigger rule of Edge Function in the address bar of the browser on both the PC and mobile terminal to preview the example effect.

References

• Runtime APIs: Fetch
• Runtime APIs: Response