Can you provide a citation for this? I’ve read older RFCs that "recommend" recipients allow single LFs to terminate headers for robustness. I’ve also read newer RFCs that weaken that recommendation and merely say the recipient "MAY" allow single LFs. I’ve never noticed an HTTP RFC say you can send headers without the full CRLF sequence, but maybe I missed something.
https://datatracker.ietf.org/doc/html/rfc2616#section-19.3 https://datatracker.ietf.org/doc/html/rfc9112#section-2.2