RFC 9931 on Security Considerations for Optimistic Protocol Transitions in HTTP/1.1

A new Request for Comments is now available in online RFC libraries.

        
        RFC 9931

        Title:      Security Considerations for Optimistic Protocol 
                    Transitions in HTTP/1.1 
        Author:     B. Schwartz
        Status:     Standards Track
        Stream:     IETF
        Date:       March 2026
        Mailbox:    ietf@bemasc.net
        Pages:      11
        Updates:    RFC 9112, RFC 9298

        I-D Tag:    draft-ietf-httpbis-optimistic-upgrade-06.txt

        URL:        https://www.rfc-editor.org/info/rfc9931

        DOI:        10.17487/RFC9931

In HTTP/1.1, the client can request a change to a new protocol on the
existing connection.  This document discusses the security
considerations that apply to data sent by the client before this
request is confirmed and adds new requirements to RFCs 9112 and 9298
to avoid related security issues.

This document is a product of the HTTP Working Group of the IETF.

This is now a Proposed Standard.

STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements.  Please refer to the current edition of the Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the 
standardization state and status of this protocol.  Distribution of this 
memo is unlimited.

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The RFC Editor Team

Received on Friday, 6 March 2026 19:53:33 UTC