Appendix F. HTTP Status Codes
The HyperText Transfer Protocol (HTTP) is an application-level
protocol for distributed, collaborative, hypermedia
systems. It is a generic, stateless protocol that can be used for
many tasks (e.g., name servers and distributed object management
systems) beyond its use for hypertext through extension of its
request methods, error codes, and headers. An important feature of
HTTP is the typing and negotiation of data representation, which
allows systems to be built independently of the data being
transferred. HTTP/1.0 is described in RFC 1945. HTTP/1.1 is the latest version of
the specification, and as of this writing HTTP/1.1 is covered in RFC
2616. Only a small subset of HTTP response codes usually is used when
writing mod_perl applications, but sometimes you need to know others
as well. We will list the codes here. Their names are fairly
self-explanatory, but you can find extended explanations in the
appropriate RFC (see section 9 in RFC 1945 and section 10 in RFC
2616). You can always find the latest links to these RFCs at the
World Wide Web Consortium's site, https://www.w3.org/Protocols/.
While HTTP/1.1 is widely supported, HTTP/1.0 still remains the
mainstream standard. Therefore, we will supply a summary for each
version, including the corresponding Apache constants.
In mod_perl, these constants can be accessed via the
Apache::Constants package (e.g., to access the
HTTP_OK constant, use
Apache::Constants::HTTP_OK). See the
Apache::Constants manpage for more information.
E.7. More Reasons to Use AxKit F.2. HTTP/1.1 Status Codes
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