--- author: canory date: 2026-03-06T15:33:13Z tags: [feeds] feed: description: "Recently published RFCs" domain: "www.rfc-editor.org" enclosure: "" favicon: "/data/media/favicon.httpswwwrfc-editororgrfcrssxml.png" home: "" link: "https://www.rfc-editor.org/info/rfc9931" name: "Recent RFCs" source: "https://www.rfc-editor.org/rfcrss.xml" --- In HTTP/1.1, the client can request a change to a new protocol on the existing connection. This document discusses the security