How to send a request and wait for the "Download" event in nodejs?

Question

Node.js

There is a site that fills out forms using a get request, and then html2canvas turns it roughly into a photo and automatically downloads

html2canvas(document.querySelector("#capture")).then(canvas => {
    document.body.appendChild(canvas);
    let img = canvas.toDataURL("image/png");
    document.write('<img src="'+img+'"/> <p><a href="'+img+'" id="file" download>Скачать файл</a>');
    file.click()
});

But it all takes time, how can I send a request to this site and wait for the file to download, after which I actually download it?
Can you give an example in code?