Naming a Downloaded File

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Naming a Downloaded File

Last updated: 2023-12-13 10:55:46

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.                              
addEventListener('fetch', event => {
  event.passThroughOnException();
  event.respondWith(handleRequest(event.request));
});
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async function handleRequest(request) {
  const url = new URL(request.url);
  const fileName = url.searchParams.get('fileName');
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  const response = await fetch(request);
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  // Evaluate the response status code and the search parameter
  if (response.status !== 200 || !fileName) {
    return response;
  }
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  // Modify the Content-Disposition response header
  response.headers.append('Content-Disposition', `attachment; filename="${fileName}"`);
  return response;
}
Sample 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.
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Related References           
﻿Runtime APIs: Fetch﻿
﻿Runtime APIs: Response﻿