expressjs : implement http file download

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Express helper, res.download

Express has a helper for this:
app.get('/xxx', function(req, res){ 
  var file = __dirname + '/xxx'; 
  res.download(file); // Set disposition and send it. 
});

http file download header

https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Disposition
res.setHeader('Content-disposition', 'attachment; filename=xxx');

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