https://app.knowbase.one/vault/rfc/docid/383
RFC9112: HTTP/1.1
Internet Engineering Task Force (IETF) R. Fielding, Ed. Request for Comments: 9112 Adobe STD: 99 M. Nottingham, Ed. Obsoletes: 7230 Fastly Cat...
https://app.knowbase.one/vault/rfc/docid/3709
RFC3326: The Reason Header Field for the Session Initiation Protocol (SIP)
Network Working Group H. Schulzrinne Request for Comments: 3326 Columbia University Category: Standards Track D. Oran Cisco ...