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Naming a Downloaded File

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));
});

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;
}

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.




Related References