HTTP Priority header

[hamishwillee]

FF128 Adds support for RFC 9218 Extensible Prioritization Scheme for HTTP in https://bugzilla.mozilla.org/show_bug.cgi?id=1865040.

This spec includes a Priority header that can be sent in requests to provide a client hint about the relative priority that a resource should be sent by a server. This can be sent in any version of HTTP.

This is documented by this PR.

This is more than just the header as the RFC also adds HTTP/2 and HTTP/3 frames to allow a hop-to-hop update of the priority expectations after the header has been sent. However we don't document these so I'll add some comments as part of the body of this doc.

Related docs work can be tracked in #33847

PS The spec is here https://www.rfc-editor.org/rfc/rfc9218.html - it is really easy to read.

[github-actions[bot]]

Preview URLs

• /en-US/docs/Web/HTTP/Headers/Priority
• /en-US/docs/Web/HTTP/Headers

(comment last updated: 2024-07-11 23:29:29)

[hamishwillee]

Thanks @bsmth - accepted all suggestions, some with minor changes.