2 ms·
Related: RFC 2119, https://www.ietf.org/rfc/rfc2119.txt https://www.ietf.org/rfc/rfc2119.txt which defines the key words "MUST", "MUST NOT", "REQUIRED", "SHALL
by dsr_ 8y ago
Related: RFC 2119, https://www.ietf.org/rfc/rfc2119.txt https://www.ietf.org/rfc/rfc2119.txt
which defines the key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL". Most subsequent RFCs begin with a reference to it.