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1. All multi-octet HTCP protocol elements are transmitted in network byte 0rder. All RESERVED fields should be set to binary zero by senders and left unexamined by receivers. Headers must be presented with the CRLF line termination, as in HTTP.
2. Any hostnames specified should be compatible between sender and receiver, such that if a private naming scheme (such as HOSTS.TXT or NIS) is in use, names depending on such schemes will only be sent to HTCP neighbors who are known to participate in said schemes.Raw addresses (dotted quad IPv4, or colon-format IPv6) are universal, as are public DNS names. Use of private names or addresses will require special operational care.
3. UDP must be supported. HTCP agents must not be isolated from NETWORK failures and delays. An HTCP agent should be prepared to act in useful ways when no response is forthcoming, or when responses are delayed or reordered or damaged. TCP is optional and is expected to be used only for protocol debugging. The IANA has assigned port 4827 as the standard TCP and UDP port number for HTCP.
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