https://app.knowbase.one/vault/rfc/docid/7399
RFC8174: Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words
Internet Engineering Task Force (IETF) B. Leiba Request for Comments: 8174 Huawei Technologies BCP: 14 May 2017 Updates: 2119 Category: Best Current Practice ISSN: 2070-1721 Ambi...