Internet Engineering Task Force (IETF)奥. 一穂
Request for Comments: 9218Fastly
Category: Standards TrackL. Pardue
ISSN: 2070-1721Cloudflare
June 2022

Extensible Prioritization Scheme for HTTP


This document describes a scheme that allows an HTTP client to communicate its preferences for how the upstream server prioritizes responses to its requests, and also allows a server to hint to a downstream intermediary how its responses should be prioritized when they are forwarded. This document defines the Priority header field for communicating the initial priority in an HTTP version-independent manner, as well as HTTP/2 and HTTP/3 frames for reprioritizing responses. These share a common format structure that is designed to provide future extensibility.