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It probably nudges the crawler to come rather than sending the page. If it's private, the crawler won't be able to see it.

> It probably nudges the crawler to come rather than sending the page. If it's private, the crawler won't be able to see it.

I'm sure that's exactly what it does. It is definitely not archiving some Facebook pages I've been browsing (that I would actually like to archive). It's only been capturing the login screen or an error about abusing the site.

It doesn't share your cookies, that probably stops almost any leak. Then probably rules to filter out legacy ?sessid= ?sID=.

Other than that I imagine it leaks things like /bank/account/id/75795 but the crawler will drop it when it returns a 40X.

Or things like private shares to Dropbox, Zoom, YT etc.? Password resets? One time login links? Etc.