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The TCP/IP Guide
9 TCP/IP Application Layer Protocols, Services and Applications (OSI Layers 5, 6 and 7)
9 TCP/IP Key Applications and Application Protocols
9 TCP/IP File and Message Transfer Applications and Protocols (FTP, TFTP, Electronic Mail, USENET, HTTP/WWW, Gopher)
9 TCP/IP World Wide Web (WWW, "The Web") and the Hypertext Transfer Protocol (HTTP)
9 TCP/IP Hypertext Transfer Protocol (HTTP)
9 HTTP Messages, Message Formats, Methods and Status Codes
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HTTP Response Message Format
(Page 2 of 3)
Status Line
The status linenot response
line, noteis the start line used for response messages.
It has two functions: to tell the client what version of the protocol
the server is using, and to communicate a summary of the results of
processing the client's request. The formal syntax for the status line
is:
<HTTP-VERSION> <status-code>
<reason-phrase>
HTTP Version
The HTTP-VERSION label in
the status line serves the same purpose as it does in the request
line of a request message; here, it tells
the client the version number that the server is using for its response.
It uses the same format as in the request line, in upper case as HTTP/0.9,
HTTP/1.0 or HTTP/1.1. The server is required
to return an HTTP version number that is no greater than that the client
sent in its request.
Status Code and Reason Phrase
The status code and reason
phrase provide information about the results of processing the client's
request in two different forms. The status code is a three-digit number
that indicates the formal result that the server is communicating to
the client; it is intended for the client HTTP implementation to process
so the software can take appropriate action. The reason phrase is an
additional, descriptive text string, which can be displayed to the human
user of the HTTP client so he or she can see how the server responded.
I
describe status codes and reason phrases later in this section,
and also list all of the standard codes.
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Version 3.0 - Version Date: September 20, 2005
© Copyright 2001-2005 Charles M. Kozierok. All Rights Reserved.
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