Please look at RFC1123. See section 4.1.2.4 (the QUOTE command), which is a MUST. See also 6.1.4.2, (DNS user interface), 6.1.4.3 (DNS abbreviation expansion), etc., etc., All of these concern themselves exclusively with how host software forms protocol messages based on user input. 6.1.4.3 seems quite analagous to cookies, since it places restrictions on how much searching a resolver can do: There is danger that a search-list mechanism will generate excessive queries to the root servers while testing whether user input is a complete domain name, lacking a final period to mark it as complete. A search-list mechanism MUST have one of, and SHOULD have both of, the following two provisions to prevent this: (a) The local resolver/name server can implement caching of negative responses (see Section 6.1.3.3). (b) The search list expander can require two or more interior dots in a generated domain name before it tries using the name in a query to non-local domain servers, such as the root. - BillReceived on Thursday, 1 August 1996 11:34:34 EDT
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