SETTINGS_ENABLE_WEBSOCKETS settings parameter for HTTP/2 and HTTP/3
draft-momoka-httpbis-settings-enable-websockets-00

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This is an older version of an Internet-Draft whose latest revision state is "Expired".
Author Momoka Yamamoto
Last updated 2023-01-07
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draft-momoka-httpbis-settings-enable-websockets-00 
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.

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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.

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   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]).

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   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, <https://www.rfc-editor.org/rfc/rfc9110>.

   [HTTP/2]   Thomson, M., Ed. and C. Benfield, Ed., "HTTP/2", RFC 9113,
              DOI 10.17487/RFC9113, April 2022,
              <https://www.rfc-editor.org/rfc/rfc9113>.

   [HTTP/3]   Bishop, M., Ed., "Hypertext Transfer Protocol Version 3
              (HTTP/3)", RFC 9114, DOI 10.17487/RFC9114, April 2022,
              <https://www.rfc-editor.org/rfc/rfc9114>.

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   [RFC6455]  Fette, I. and A. Melnikov, "The WebSocket Protocol",
              RFC 6455, DOI 10.17487/RFC6455, December 2011,
              <https://www.rfc-editor.org/rfc/rfc6455>.

   [RFC8441]  McManus, P., "Bootstrapping WebSockets with HTTP/2",
              RFC 8441, DOI 10.17487/RFC8441, September 2018,
              <https://www.rfc-editor.org/rfc/rfc8441>.

   [RFC9220]  Hamilton, R., "Bootstrapping WebSockets with HTTP/3",
              RFC 9220, DOI 10.17487/RFC9220, June 2022,
              <https://www.rfc-editor.org/rfc/rfc9220>.

5.2.  Informative References

   [WEBTRANSPORT]
              Vasiliev, V., "The WebTransport Protocol Framework", Work
              in Progress, Internet-Draft, draft-ietf-webtrans-overview-
              04, 11 July 2022, <https://datatracker.ietf.org/doc/html/
              draft-ietf-webtrans-overview-04>.

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

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