How to download file with puppeteer using headless: true?

Question

I\'ve been running the following code in order to download a csv file from the website http://niftyindices.com/resources/holiday-calendar:

Answer 1

I spent hours poring through this thread and Stack Overflow yesterday, trying to figure out how to get Puppeteer to download a csv file by clicking a download link in headless mode in an authenticated session. The accepted answer here didn't work in my case because the download does not trigger targetcreated, and the next answer, for whatever reason, did not retain the authenticated session. This article saved the day. In short, fetch. Hopefully this helps someone else out.

const res = await this.page.evaluate(() =>
{
    return fetch('https://example.com/path/to/file.csv', {
        method: 'GET',
        credentials: 'include'
    }).then(r => r.text());
});