Relevant Standards

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This page documents all the relevant standards that the Apache HTTP Server follows, along with brief descriptions.

In addition to the information listed below, the following resources should be consulted:

http://purl.org/NET/http-errata - HTTP/1.1 Specification Errata
http://www.rfc-editor.org/errata.html - RFC Errata
http://ftp.ics.uci.edu/pub/ietf/http/#RFC - A pre-compiled list of HTTP related RFCs

This document is not yet complete.

HTTP Recommendations

Regardless of what modules are compiled and used, Apache as a basic web server complies with the following IETF recommendations:

RFC 1945 (Informational): The Hypertext Transfer Protocol (HTTP) is an application-level protocol with the lightness and speed necessary for distributed, collaborative, hypermedia information systems. This documents HTTP/1.0.
RFC 2616 (Standards Track): The Hypertext Transfer Protocol (HTTP) is an application-level protocol for distributed, collaborative, hypermedia information systems. This documents HTTP/1.1.
RFC 2396 (Standards Track): A Uniform Resource Identifier (URI) is a compact string of characters for identifying an abstract or physical resource.

Regarding the Hypertext Markup Language, Apache complies with the following IETF and W3C recommendations:

RFC 2854 (Informational): This document summarizes the history of HTML development, and defines the "text/html" MIME type by pointing to the relevant W3C recommendations.
HTML 4.01 Specification (Errata): This specification defines the HyperText Markup Language (HTML), the publishing language of the World Wide Web. This specification defines HTML 4.01, which is a subversion of HTML 4.
HTML 3.2 Reference Specification: The HyperText Markup Language (HTML) is a simple markup language used to create hypertext documents that are portable from one platform to another. HTML documents are SGML documents.
XHTML 1.1 - Module-based XHTML (Errata): This Recommendation defines a new XHTML document type that is based upon the module framework and modules defined in Modularization of XHTML.
XHTML 1.0 The Extensible HyperText Markup Language (Second Edition) (Errata): This specification defines the Second Edition of XHTML 1.0, a reformulation of HTML 4 as an XML 1.0 application, and three DTDs corresponding to the ones defined by HTML 4.

Concerning the different methods of authentication, Apache follows the following IETF recommendations:

RFC 2617 (Draft standard): "HTTP/1.0", includes the specification for a Basic Access Authentication scheme.

The following links document ISO and other language and country code information:

ISO 639-2: ISO 639 provides two sets of language codes, one as a two-letter code set (639-1) and another as a three-letter code set (this part of ISO 639) for the representation of names of languages.
ISO 3166-1: These pages document the country names (official short names in English) in alphabetical order as given in ISO 3166-1 and the corresponding ISO 3166-1-alpha-2 code elements.
BCP 47 (Best Current Practice), RFC 3066: This document describes a language tag for use in cases where it is desired to indicate the language used in an information object, how to register values for use in this language tag, and a construct for matching such language tags.
RFC 3282 (Standards Track): This document defines a "Content-language:" header, for use in cases where one desires to indicate the language of something that has RFC 822-like headers, like MIME body parts or Web documents, and an "Accept-Language:" header for use in cases where one wishes to indicate one's preferences with regard to language.