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https://www.ietf.org/rfc/rfc9110.html

…cter encoding scheme", "charset", and "protocol element" as they are defined in RFC6365 2.2. Requirements Notation The key words " MUST ", " MUST NOT ", REQUIRED ", " SHALL ", " SHALL NOT ", SHOULD ", " SHOULD NOT ", RECOMMENDED ", " NOT RECOMMENDED ", MAY ", and " OPTIONAL " in …