Final answer:
To set the Content-Disposition header in JavaScript, it's typically done server-side, such as in a Node.js application. Using Express.js.
Step-by-step explanation:
To set the Content-Disposition header in JavaScript, you'll often be working in the context of a web server or when dealing with HTTP response headers. If you're working on the client-side with JavaScript, setting the Content-Disposition header is not typically done because it's a response header.
Meaning it instructs how the content should be handled by the browser once received. However, when working server-side, for example with Node.js, you might set this header using the response object in an HTTP request handler. Here is how you might set it in an Express.js application:
app.get('/download', function(req, res){
res.setHeader('Content-Disposition', 'attachment; filename=example.pdf');
res.sendFile('/path/to/example.pdf');
});
This would prompt the browser to download the file as 'example.pdf' when the /download route is accessed.