HTTP 山本 桃歌 (M. Yamamoto) Internet-Draft The University of Tokyo/WIDE Project Updates: 8441, 9220 (if approved) 7 January 2023 Intended status: Standards Track Expires: 11 July 2023 SETTINGS_ENABLE_WEBSOCKETS settings parameter for HTTP/2 and HTTP/3 draft-momoka-httpbis-settings-enable-websockets-00 Abstract This document proposes a new HTTP settings parameter, SETTINGS_ENABLE_WEBSOCKETS. This parameter indicates whether the server supports bootstrapping WebSockets over the established connection. Discussion Venues This note is to be removed before publishing as an RFC. Discussion of this document takes place on the HTTP Working Group mailing list (ietf-http-wg@w3.org), which is archived at https://lists.w3.org/Archives/Public/ietf-http-wg/. Source for this draft and an issue tracker can be found at https://github.com/momoka0122y/draft-settings-enable-websockets. Status of This Memo This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at https://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." This Internet-Draft will expire on 11 July 2023. Yamamoto Expires 11 July 2023 [Page 1] Internet-Draft SETTINGS_ENABLE_WEBSOCKETS January 2023 Copyright Notice Copyright (c) 2023 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/ license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Revised BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Revised BSD License. Table of Contents 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 2. SETTINGS_ENABLE_WEBSOCKETS settigs parameter for H2 and H3 . 3 3. Security Considerations . . . . . . . . . . . . . . . . . . . 3 4. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3 4.1. HTTP3 . . . . . . . . . . . . . . . . . . . . . . . . . . 3 4.2. HTTP2 . . . . . . . . . . . . . . . . . . . . . . . . . . 4 5. References . . . . . . . . . . . . . . . . . . . . . . . . . 4 5.1. Normative References . . . . . . . . . . . . . . . . . . 4 5.2. Informative References . . . . . . . . . . . . . . . . . 5 Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 5 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 5 1. Introduction The mechanisms for running the WebSocket protocol [RFC6455] over a single stream of an HTTP/2 and HTTP/3 connection is defined in [RFC8441] and [RFC9220]. The extended CONNECT mechanism is used for bootstrapping WebSockets from HTTP/2 and HTTP/3. Support for the extended CONNECT mechanism is advertised using HTTP/2 and HTTP/3 settings parameter SETTINGS_ENABLE_CONNECT_PROTOCOL. However, the support of extended CONNECT does not necessarily indicate support for WebSockets over that HTTP connection. Other protocols such as [WEBTRANSPORT] also use extended CONNECT and send SETTINGS_ENABLE_CONNECT_PROTOCOL settings parameters as well. Suppose the server supports extended CONNECT but not bootstrapping WebSockets over that HTTP connection. In this case, the client sending a WebSocket handshake request will result in a response of 501 (Not Implemented) status code (Section 15.6.2 of [HTTP]), and the client would need to fall back to trying the WebSocket handshake over HTTP/1. Yamamoto Expires 11 July 2023 [Page 2] Internet-Draft SETTINGS_ENABLE_WEBSOCKETS January 2023 This is why a SETTINGS_ENABLE_WEBSOCKETS settings parameter is needed. 2. SETTINGS_ENABLE_WEBSOCKETS settigs parameter for H2 and H3 This document adds a new SETTINGS parameter to those defined by [HTTP/3] Section 11.2.2 and [HTTP/2] Section 11.3. The new parameter name is SETTINGS_ENABLE_WEBSOCKETS. The value of the parameter MUST be 0 or 1, with 0 being the default. A sender MUST NOT send a SETTINGS_ENABLE_WEBSOCKETS parameter with the value of 0 after previously sending a value of 1. If the server supports bootstrapping WebSockets over the HTTP connection, it SHOULD include the SETTINGS_ENABLE_WEBSOCKETS parameter in the SETTINGS frame with a value of 1. If the server does not support bootstrapping WebSockets over the HTTP connection it SHOULD send the parameter with a value of 0. A client MUST not send this setting parameter. Receipt of this parameter by a server does not have any impact. The SETTINGS_ENABLE_WEBSOCKETS parameter would allow the client to determine in advance whether the server supports WebSockets over the connection for HTTP/2 or HTTP/3. This allows the client to avoid sending unnecessary WebSocket handshake requests on HTTP connections that do not support WebSockets. This mechanism will improve compatibility with other extended CONNECT-based protocols. For compatibility with past implementations which do not use this parameter, clients MAY initiate a WebSocket request without the receipt of this parameter. 3. Security Considerations This document introduces no new security considerations beyond those discussed in [RFC8441]. 4. IANA Considerations 4.1. HTTP3 This document registers a new entry in the "HTTP/3 Settings" registry (Section 11.2.2 of [HTTP/3]). Yamamoto Expires 11 July 2023 [Page 3] Internet-Draft SETTINGS_ENABLE_WEBSOCKETS January 2023 Value: TBD Setting Name: SETTINGS_ENABLE_WEBSOCKETS Default: 0 Status: permanent Specification: This document Change Controller: IETF Contact: HTTP Working Group (ietf-http-wg@w3.org) 4.2. HTTP2 This document registers a new entry in the "HTTP/2 Settings" registry (Section 11.1 of [HTTP/2]). Code: TBD Name: SETTINGS_ENABLE_ENABLE_WEBSOCKETS Default: 0 Status: permanent Specification: This document Change Controller: IETF Contact: HTTP Working Group (ietf-http-wg@w3.org) 5. References 5.1. Normative References [HTTP] Fielding, R., Ed., Nottingham, M., Ed., and J. Reschke, Ed., "HTTP Semantics", RFC 9110, DOI 10.17487/RFC9110, April 2022, . [HTTP/2] Thomson, M., Ed. and C. Benfield, Ed., "HTTP/2", RFC 9113, DOI 10.17487/RFC9113, April 2022, . [HTTP/3] Bishop, M., Ed., "Hypertext Transfer Protocol Version 3 (HTTP/3)", RFC 9114, DOI 10.17487/RFC9114, April 2022, . Yamamoto Expires 11 July 2023 [Page 4] Internet-Draft SETTINGS_ENABLE_WEBSOCKETS January 2023 [RFC6455] Fette, I. and A. Melnikov, "The WebSocket Protocol", RFC 6455, DOI 10.17487/RFC6455, December 2011, . [RFC8441] McManus, P., "Bootstrapping WebSockets with HTTP/2", RFC 8441, DOI 10.17487/RFC8441, September 2018, . [RFC9220] Hamilton, R., "Bootstrapping WebSockets with HTTP/3", RFC 9220, DOI 10.17487/RFC9220, June 2022, . 5.2. Informative References [WEBTRANSPORT] Vasiliev, V., "The WebTransport Protocol Framework", Work in Progress, Internet-Draft, draft-ietf-webtrans-overview- 04, 11 July 2022, . Acknowledgments TODO acknowledge people. Thank you for reading this draft. :) Author's Address Momoka Yamamoto The University of Tokyo/WIDE Project Japan Email: momoka.my6@gmail.com Additional contact information: 山本 桃歌 Japan The University of Tokyo/WIDE Project Yamamoto Expires 11 July 2023 [Page 5]