RFC 9931
Security Considerations for Optimistic Protocol Transitions in HTTP/1.1, March 2026
- File formats:

- Also available: XML file for editing
- Status:
- PROPOSED STANDARD
- Updates:
- RFC 9112, RFC 9298
- Author:
- B. Schwartz
- Stream:
- IETF
- Source:
- httpbis (wit)
Cite this RFC: TXT | XML | BibTeX
DOI: https://doi.org/10.17487/RFC9931
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Abstract
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.
For the definition of Status, see RFC 2026.
For the definition of Stream, see RFC 8729.