HTTP was first specified in the early 1990s. Designed with extensibility in mind, it has seen numerous additions over the years; this lead to its specification being scattered through numerous specification documents (in the midst of experimental abandoned extensions). This page lists relevant resources about HTTP.
Specification Title Status RFC 9110 HTTP Semantics Internet Standard RFC 9111 HTTP Caching Internet Standard RFC 9112 HTTP/1.1 Internet Standard RFC 9113 HTTP/2 Proposed Standard RFC 9114 HTTP/3 Proposed Standard RFC 5861 HTTP Cache-Control Extensions for Stale Content Informational RFC 8246 HTTP Immutable Responses Proposed Standard RFC 6265 HTTP State Management Mechanism Defines Cookies Proposed Standard Draft spec Cookie Prefixes IETF Draft Draft spec Same-Site Cookies IETF Draft Draft spec Deprecate modification of 'secure' cookies from non-secure origins IETF Draft RFC 2145 Use and Interpretation of HTTP Version Numbers Informational RFC 6585 Additional HTTP Status Codes Proposed Standard RFC 7725 An HTTP Status Code to Report Legal Obstacles On the standard track RFC 2397 The "data" URL scheme Proposed Standard RFC 3986 Uniform Resource Identifier (URI): Generic Syntax Internet Standard RFC 5988 Web Linking Defines theLink header Proposed Standard Draft spec HTTP Client Hints IETF Draft RFC 7578 Returning Values from Forms: multipart/form-data Proposed Standard RFC 6266 Use of the Content-Disposition Header Field in the Hypertext Transfer Protocol (HTTP) Proposed Standard RFC 2183 Communicating Presentation Information in Internet Messages: The Content-Disposition Header Field Only a subset of syntax of the Content-Disposition header can be used in the context of HTTP messages. Proposed Standard RFC 7239 Forwarded HTTP Extension Proposed Standard RFC 6455 The WebSocket Protocol Proposed Standard RFC 5246 The Transport Layer Security (TLS) Protocol Version 1.2 This specification has been modified by subsequent RFCs, but these modifications have no effect on the HTTP protocol. Proposed Standard RFC 8446 The Transport Layer Security (TLS) Protocol Version 1.3 Supersedes TLS 1.2. Proposed Standard RFC 2817 Upgrading to TLS Within HTTP/1.1 Proposed Standard RFC 7541 HPACK: Header Compression for HTTP/2 On the standard track RFC 7838 HTTP Alternative Services On the standard track RFC 7301 Transport Layer Security (TLS) Application-Layer Protocol Negotiation Extension Used to negotiate HTTP/2 at the transport to save an extra request/response round trip. Proposed Standard RFC 6454 The Web Origin Concept Proposed Standard Fetch Cross-Origin Resource Sharing Living Standard RFC 7034 HTTP Header Field X-Frame-Options Informational RFC 6797 HTTP Strict Transport Security (HSTS) Proposed Standard Upgrade Insecure Requests Upgrade Insecure Requests Candidate Recommendation Content Security Policy specification Content Security Policy Level 3 Obsolete Microsoft document Specifying legacy document modes* Defines X-UA-Compatible Note RFC 5689 HTTP Extensions for Web Distributed Authoring and Versioning (WebDAV) These extensions of the Web, as well as CardDAV and CalDAV, are out-of-scope for HTTP on the Web. Modern APIs for application are defines using the RESTful pattern nowadays. Proposed Standard RFC 2324 Hyper Text Coffee Pot Control Protocol (HTCPCP/1.0) April 1st joke spec RFC 7168 The Hyper Text Coffee Pot Control Protocol for Tea Efflux Appliances (HTCPCP-TEA) April 1st joke spec HTML Living Standard HTML Defines extensions of HTTP for Server-Sent Events Living Standard Reporting API Report-To header Draft Draft spec Expect-CT Extension for HTTP IETF Draft RFC 7486 HTTP Origin-Bound Auth (HOBA) Experimental See also
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