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RFC977 defines the NNTP protocol and was released over a decade ago. Since then, NNTP has become one of the most popular protocols in use on the Internet. Many implementations of the protocol have been created on many different platforms and operating systems. With the growth in use of the protocol, work began on a revision to NNTP in 1991, but that work did not result in a new standard protocol specification. However, many ideas from that working group did find their way into many implementations of NNTP. Additionally, many other extensions, often created by newsreader authors, are also in use. This document will capture and define all known extensions to NNTP available in official NNTP server releases of some type as of this writing. Where possible, the server software first implementing a particular extension will be noted. It is the hope of the author that using this document in tandem with RFC977 will limit the addition of new extensions that essentially do the same thing. Software developers may wish to use this document and others as a resource for the development of new software. This document does not specify an Internet Standard of any kind. It only attempts to document current practices. While this document may clarify some ambiguity in RFC977, RFC977 should be regarded as authoritative in all cases. There are some implementations that are not strictly RFC977 compliant and where necessary, these deviations from the standard will be noted. This document does reflect the work of the IETF NNTP-EXT working group chaired by Ned Freed and Stan Barber. This document is provided to help implementers have a uniform source of information about extensions, however, it is important for any prospective implementer to understand that the extensions listed here are NOT part of any current standard for NNTP. In fact, some of the ones listed in this document should not be included in new NNTP implementations as they should no longer be used modern NNTP environments. Such commands should be considered historic and are documented as such in this document. Extensions fall into three categories: transport, newsreader and other. Transport extensions are additions to the NNTP specification that were made specifically to move news articles from one server to another server. Newsreader extensions are additions to the NNTP specification that were made to assist NNTP clients in selecting and retrieving news articles from servers. Other extensions to the NNTP specification are those which did not specifically fall into either of the other two categories. Examples of other extensions include authentication and time-of-day extensions. For each command, the format of section 3 of RFC977 will be used.
|[Source:"draft-ietf-nntp-imp-02.txt"] [Last Changed:March 1998]|
[Copyright: 1998 S. Barber]