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Assuming you want this done automatically, what's the advantage of 'printing' multiple tabs to PDF in a headless browser, over just sequentially loading and printing the pages you want done?

You can give https://screen.rip/#pdf a try. It supports capturing pages behind auth.

Not yet, but we can quite easily add these features. Just let me know at jan@apify.com what would you need

Chrome headless does, just specify the --user-data-dir parameter to give it a profile to use (a profile where you're authenticated to the site you want to snapshot).

e.g.

chrome --disable-gpu --headless --user-data-dir=/Users/username/Library/Application\ Support/Google/Chrome/Default https://example.com/paywall/article.html

Alternatively, use puppeteer to script the auth process. https://github.com/GoogleChrome/puppeteer