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Comment: Add a link to RFC 9218.

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HTTP 0.9

The Original HTTP as defined in 1991 at W3.org

HTTP/1.0

RFC 1945 (May 1996) - Hypertext Transfer Protocol -- HTTP/1.0

HTTP/1.1

RFC 2068 (January 1997) - Hypertext Transfer Protocol -- HTTP/1.1 - obsolete, replaced by 2616
RFC 2616 (June 1999) - Hypertext Transfer Protocol -- HTTP/1.1 - obsolete, replaced by 7230...7235

RFC 7230 (June 2014) - Message Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and Routing - obsolete, replaced by 9110, 9112
RFC 7231 (June 2014) - Hypertext Transfer Protocol (HTTP/1.1): Semantics and Content - obsolete, replaced by 9110
RFC 7232 (June 2014) - Hypertext Transfer Protocol (HTTP/1.1): Conditional Requests - obsolete, replaced by 9110
RFC 7233 (June 2014) - Hypertext Transfer Protocol (HTTP/1.1): Range Requests - obsolete, replaced by 9110
RFC 7234 (June 2014) - CachingHypertext Transfer Protocol (HTTP/1.1): Caching - obsolete, replaced by 9111
RFC 7235 (June 2014) - Hypertext Transfer Protocol (HTTP/1.1): Authentication - obsolete, replaced by 9110

RFC 9110 (June 2022) - HTTP Semantics
RFC 9111 (June 2022) - HTTP Caching
RFC 9112 (June 2022) - HTTP/1.1

HTTP/2

HTTP/2 home page, maintained by the IETF HTTPbis Working Group

RFC 7540 (May 2015) - Hypertext Transfer Protocol Version 2 (HTTP/2) - obsolete, replaced by 9113
RFC 7541 (May 2015) - HPACK: Header Compression for HTTP/2

RFC 9113 (June 2022) - HTTP/2 home page, maintained by the IETF HTTPbis Working Group

HTTP/3

RFC 9114 (June 2022) - HTTP/3

Not yet implemented by Apache Tomcat. (As of July 2022)

 HTTP - Related Specifications

BASIC and DIGEST authentication methods

RFC 2068 (January 1997) - Hypertext Transfer Protocol -- HTTP/1.1 - obsolete, replaced by 2616
RFC 2069 (January 1997) - An Extension to HTTP : Digest Access Authentication - obsolete, replaced by 2617.
The authentication as a whole and the BASIC authentication method were defined in RFC 2068 ch.11. The DIGEST authentication method was defined in RFC 2069.

RFC 2617 (June 1999) - " HTTP Authentication: Basic and Digest Access Authentication "- obsolete,
It covers BASIC and DIGEST authentication methods

RFC 7616 (September 2015) - HTTP Digest Access Authentication
RFC 7617 (September 2015) - The 'Basic' HTTP Authentication Scheme

See also RFC 7235 (obsolete), RFC 7615 (obsolete), RFC 9110It was updated by RFC 7235.

RFC 6265

"HTTP State Management Mechanism"

The specification about cookies. It is implemented by org.apache.tomcat.util.http.Rfc6265CookieProcessor that is available since Tomcat 8.0.15 and is the default one starting with Tomcat 8.5.0. See also "Cookies" page in "Development and Development Issues / Archive" on this wiki.

Obsolete specifications: RFC2109, RFC 2965.

RFC 6266

"Use of the Content-Disposition Header Field in the Hypertext Transfer Protocol (HTTP)"

Content-Disposition header is used by file uploads. See also Bug 59115

draft-thomson-hybi-http-timeout-03

"Hypertext Transfer Protocol (HTTP) Keep-Alive Header". A draft of specification.

Support for sending a Keep-Alive response header was added in Tomcat 8.5.48, 9.0.29 — Bug 63835. This feature can be turned off via an attribute on HTTP/1.1 Connector.

RFC 9218 (June 2022)

"Extensible Prioritization Scheme for HTTP"

Defines prioritization scheme and priority signals. To be used in HTTP/2 as a replacement for the original specification of stream priority signals (defined by RFC 7540) that was later deprecated by RFC 9113 (section 5.3.2.).

Not yet implemented by Apache Tomcat. (As of December 6th 2022)

See discussion.

AJP

The AJP protocol specification lives on the Apache Tomcat Connector web site.

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