2. 符号约定

RFC Editor text: <a href=https://www.rfc-editor.org/rfc/rfc9001.txt target=_blank rel="noopener noreferrer" class="">RFC 9001
Datatracker page: <a href=https://datatracker.ietf.org/doc/html/rfc9001 target=_blank rel="noopener noreferrer" class="">RFC 9001

This compatibility page replaces an old generated placeholder for RFC 9001. The authoritative text for this section is available in the official RFC sources.