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Security Considerations for Optimistic Use of HTTP Upgrade

Document Type Expired Internet-Draft (httpbis WG)
Expired & archived
Author Benjamin M. Schwartz
Last updated 2024-02-22 (Latest revision 2023-08-21)
RFC stream Internet Engineering Task Force (IETF)
Intended RFC status (None)
Additional resources Mailing list discussion
Stream WG state Adopted by a WG
Document shepherd (None)
IESG IESG state Expired
Consensus boilerplate Unknown
Telechat date (None)
Responsible AD (None)
Send notices to (None)

This Internet-Draft is no longer active. A copy of the expired Internet-Draft is available in these formats:


The HTTP/1.1 Upgrade mechanism allows the client to request a change to a new protocol. This document discusses the security considerations that apply to data sent by the client before this request is confirmed, and updates RFC 9298 to avoid related security issues.


Benjamin M. Schwartz

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)