Earlier quoted context omitted.
I'll just leave this here for you: https://datatracker.ietf.org/doc/html/rfc7231#section-5.5.2
That's a good one. Since legacy code is less likely to change than the English language, I just call it a "referer" in writing unrelated to HTTP. That way, I'm never confused. (Everyone else? Good luck.)
“Tests pass, ship it”