Bootstrapping WebSockets with HTTP/3
draft-ietf-httpbis-h3-websockets-02

HTTP                                                         R. Hamilton
Internet-Draft                                                    Google
Intended status: Standards Track                         12 January 2022
Expires: 16 July 2022

                  Bootstrapping WebSockets with HTTP/3
                  draft-ietf-httpbis-h3-websockets-02

Abstract

   The mechanism for running the WebSocket Protocol over a single stream
   of an HTTP/2 connection is equally applicable to HTTP/3, but the HTTP
   version-specific details need to be specified.  This document
   describes how the mechanism is adapted for HTTP/3.

About This Document

   This note is to be removed before publishing as an RFC.

   Status information for this document may be found at
   https://datatracker.ietf.org/doc/draft-ietf-httpbis-h3-websockets/.

   Discussion of this document takes place on the HTTP Working Group
   mailing list (mailto:ietf-http-wg@w3.org), which is archived at
   https://lists.w3.org/Archives/Public/ietf-http-wg/.  Working Group
   information can be found at https://httpwg.org/.

   Source for this draft and an issue tracker can be found at
   https://github.com/httpwg/http-extensions/labels/h3-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
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   Internet-Drafts are draft documents valid for a maximum of six months
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   This Internet-Draft will expire on 16 July 2022.

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Copyright Notice

   Copyright (c) 2022 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/
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   Please review these documents carefully, as they describe your rights
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   provided without warranty as described in the Revised BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Conventions and Definitions . . . . . . . . . . . . . . . . .   2
   3.  Websockets Upgrade over HTTP/3  . . . . . . . . . . . . . . .   2
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   3
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   3
   6.  Normative References  . . . . . . . . . . . . . . . . . . . .   3
   Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . .   4
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   4

1.  Introduction

   [RFC8441] defines an extension to HTTP/2 which is also useful in
   HTTP/3.  This extension makes use of an HTTP/2 setting.  Appendix A.3
   of [HTTP3] describes the required updates for HTTP/2 settings to be
   used with HTTP/3.

2.  Conventions and Definitions

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in
   BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

3.  Websockets Upgrade over HTTP/3

   [RFC8441] defines a mechanism for running the WebSocket Protocol
   [RFC6455] over a single stream of an HTTP/2 connection.  It defines
   an Extended CONNECT method which specifies a new ":protocol" pseudo
   header field and new semantics for the ":path" and ":authority"
   pseudo header fields.  It also defines a new HTTP/2 setting sent by a
   server to allow the client to use Extended CONNECT.

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   The HTTP/3 stream closure is also analogous to the TCP connection
   closure of [RFC6455].  Orderly TCP-level closures are represented as
   a FIN bit on the stream (Section 4.2 of [HTTP3]).  RST exceptions are
   represented with an stream error (Section 8 of [HTTP3]) of type
   H3_REQUEST_CANCELLED (Section 8.1 of [HTTP3]).

   The semantics of the headers and setting are identical to those in
   HTTP/2 as defined [RFC8441].  Appendix A.3 of [HTTP3] requires that
   HTTP/3 settings be registered separately for HTTP/3.  The
   SETTINGS_ENABLE_CONNECT_PROTOCOL value is 0x08 (decimal 8), as in
   HTTP/2.

   If a server advertises support for Extended CONNECT but receives an
   Extended CONNECT request with a ":protocol" value that is unknown or
   is not supported, the server SHOULD respond to the request with a 501
   (Not Implemented) status code (Section 15.6.2 of [HTTP]).  A server
   MAY provide more information via a Problem Details response
   [RFC7807].

4.  Security Considerations

   This document introduces no new security considerations beyond those
   discussed in [RFC8441].

5.  IANA Considerations

   This document registers a new setting in the "HTTP/3 Settings"
   registry (Section 11.2.2 of [HTTP3]).

   Value:  0x08

   Setting Name:  SETTINGS_ENABLE_CONNECT_PROTOCOL

   Default:  0

   Status:  permanent

   Specification:  This Document

   Date:  [ date of publication ]

   Change Controller:  IETF

   Contact:  HTTP Working Group (ietf-http-wg@w3.org)

   Notes:

6.  Normative References

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   [HTTP]     Fielding, R. T., Nottingham, M., and J. Reschke, "HTTP
              Semantics", Work in Progress, Internet-Draft, draft-ietf-
              httpbis-semantics-19, 12 September 2021,
              <https://datatracker.ietf.org/doc/html/draft-ietf-httpbis-
              semantics-19>.

   [HTTP3]    Bishop, M., "Hypertext Transfer Protocol Version 3
              (HTTP/3)", Work in Progress, Internet-Draft, draft-ietf-
              quic-http-34, 2 February 2021,
              <https://datatracker.ietf.org/doc/html/draft-ietf-quic-
              http-34>.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/rfc/rfc2119>.

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

   [RFC7807]  Nottingham, M. and E. Wilde, "Problem Details for HTTP
              APIs", RFC 7807, DOI 10.17487/RFC7807, March 2016,
              <https://www.rfc-editor.org/rfc/rfc7807>.

   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
              May 2017, <https://www.rfc-editor.org/rfc/rfc8174>.

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

Acknowledgments

   TODO acknowledge.

Author's Address

   Ryan Hamilton
   Google

   Email: rch@google.com

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