RFC 9111 · INTERNET STANDARD · 2022
SAT · 13 JUN 2026
HTTP Caching
Overview
RFC 9111, “HTTP Caching”, is an Internet Standard document published in June 2022 by R. Fielding, M. Nottingham, J. Reschke. It obsoletes RFC 7234. The canonical text is published by the RFC Editor.
Abstract
The Hypertext Transfer Protocol (HTTP) is a stateless application-level protocol for distributed, collaborative, hypertext information systems. This document defines HTTP caches and the associated header fields that control cache behavior or indicate cacheable response messages.
This document obsoletes RFC 7234.
What “Internet Standard” means
A mature, widely-implemented specification that has completed the full IETF standards process — the highest maturity level on the standards track.
Read this RFC
The canonical text of RFC 9111 is hosted at rfc-editor.org. Available in HTML,TXT,PDF,XML.
Relationships to other RFCs
Other RFCs from 2022
- RFC 9110 HTTP Semantics
- RFC 9112 HTTP/1.1
- RFC 9113 HTTP/2
- RFC 9114 HTTP/3
- RFC 9116 A File Format to Aid in Security Vulnerability Disclosure
- RFC 9124 A Manifest Information Model for Firmware Updates in Internet of Things Devices
- RFC 9128 YANG Data Model for Protocol Independent Multicast
- RFC 9129 YANG Data Model for the OSPF Protocol