How to make a spring-loaded members-only page?

Say I have a page, named, oh, pot-of-gold. I only want members to be able to see it. In that page's yaml front matter I have:

title: Pot of Gold!
    _logged_in: true

Thus, when someone types in the URL, and they are not already logged in, they get redirected to my spiffy site's members login page. So far, so good. But, next: fail.

For the life of me, I cannot figure out what needs to go where in order to have the successfully logged-in user, once they've completed the form, get automatically redirected back to the url they requested, namely Yep, I could hard code it, but that's not the point: I have many pages that I want to protect, so it's gotta be done using a variable, a URL hack/snipping/sniping/son-of-a-gun/something or other.

I have read, re-read, and re-re-read the documentation, and I don't GET the GET stuff. Eh? It neither ignites a sufficient number or neurons nor make my "monkey-see-monkey-do" monkey very happy. I have spent much time trying various things involving quotes, no quotes, single braces, no braces, belts, thumbtacks, baling wire and twine... All to no avail.

Code snippets for a working example would be much appreciated! (Already be on github? If so, I couldn't find it. :-(

Me = Soggy camper, caught out in a downpour, middle of the woods, no tent.

Answered by David G. Smith!
>>>>>>> Answered <<<<<<<
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