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NNTP Status Responses and Response Codes
(Page 1 of 3)
Each time the device acting as a
client in an NNTP connection sends a command, the server sends back
a response. The response serves to acknowledge receipt of the
command, to inform the client of the results of processing the command,
and possibly to prompt for additional information. Since NNTP commands
are structured and formatted in a way very similar to that of SMTP commands,
I'm sure it will come as no great surprise that NNTP responses are likewise
very similar to those
of SMTP. In turn, SMTP responses are based
system designed for replies in FTP.
The first line of an NNTP response
consists of a three-digit numerical response code, as well as
a line of descriptive text that summarizes the response. These response
codes are structured so that each digit has a particular significance,
which allows the client to quickly determine the status of the command
to which the reply was sent. After the initial response line, depending
on the reply, a number of additional response lines may follow. For
example, a successful LIST command results in a 215 response
code, followed by a list of newsgroups.
Background Information: The topic on FTP reply codes discusses more completely the reasons why numeric reply codes are used in addition to descriptive text.
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The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005
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