Internet Engineering Task Force (IETF)                       R. Hamilton
Request for Comments: 9220                                        Google
Category: Standards Track                                      June 2022
ISSN: 2070-1721

Bootstrapping WebSockets with HTTP/3




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.


Status of This Memo


This is an Internet Standards Track document.


This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on Internet Standards is available in Section 2 of RFC 7841.

このドキュメントは、インターネットエンジニアリングタスクフォース(IETF)の製品です。IETFコミュニティのコンセンサスを表しています。公開レビューを受けており、インターネットエンジニアリングステアリンググループ(IESG)からの出版が承認されています。インターネット標準の詳細については、RFC 7841のセクション2で入手できます。

Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at


Copyright Notice


Copyright (c) 2022 IETF Trust and the persons identified as the document authors. All rights reserved.

著作権(c)2022 IETF Trustおよび文書著者として特定された人。全著作権所有。

This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents ( 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.

このドキュメントは、BCP 78およびIETFドキュメント(に関連するIETF Trustの法的規定の対象となります。この文書に関するあなたの権利と制限を説明するので、これらの文書を注意深く確認してください。このドキュメントから抽出されたコードコンポーネントには、セクション4.Eで説明されている法的規定のセクション4.Eで説明されており、修正されたBSDライセンスで説明されているように保証なしで提供される修正されたBSDライセンステキストを含める必要があります。

Table of Contents


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

"Bootstrapping WebSockets with HTTP/2" [RFC8441] defines an extension to HTTP/2 [HTTP/2] that is also useful in HTTP/3 [HTTP/3]. This extension makes use of an HTTP/2 setting. Appendix A.3 of [HTTP/3] gives some guidance on what changes (if any) are appropriate when porting settings from HTTP/2 to HTTP/3.

「HTTP/2のブートストラップWebStocket」[RFC8441]は、HTTP/3 [HTTP/3]にも役立つHTTP/2 [HTTP/2]の拡張を定義します。この拡張機能は、HTTP/2設定を使用します。[http/3]の付録A.3は、HTTP/2からHTTP/3に設定を移植するときに適切な変更(ある場合)に関するガイダンスを示しています。

2. Conventions and Definitions
2. 慣習と定義

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.

この文書のキーワード "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", および "OPTIONAL" はBCP 14 [RFC2119] [RFC8174]で説明されているように、すべて大文字の場合にのみ解釈されます。

3. WebSockets Upgrade over HTTP/3
3. WebSocketsはHTTP/3でアップグレードします

[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 that 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.


The semantics of the pseudo-header fields and setting are identical to those in HTTP/2 as defined in [RFC8441]. Appendix A.3 of [HTTP/3] 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].


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 4.4 of [HTTP/3]). RST exceptions are represented with a stream error (Section 8 of [HTTP/3]) of type H3_REQUEST_CANCELLED (Section 8.1 of [HTTP/3]).


4. Security Considerations
4. セキュリティ上の考慮事項

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


5. IANA Considerations
5. IANAの考慮事項

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


Value: 0x08 Setting Name: SETTINGS_ENABLE_CONNECT_PROTOCOL Default: 0 Status: permanent Specification: This document Change Controller: IETF Contact: HTTP Working Group (


6. Normative References
6. 引用文献

[HTTP] Fielding, R., Ed., Nottingham, M., Ed., and J. Reschke, Ed., "HTTP Semantics", STD 97, RFC 9110, DOI 10.17487/RFC9110, June 2022, <>.

[HTTP] Fielding、R.、Ed。、Nottingham、M.、Ed。、およびJ. Reschke、ed。、 "HTTP Semantics"、Std 97、RFC 9110、DOI 10.17487/RFC9110、2022年6月、<>。

[HTTP/2] Thomson, M., Ed. and C. Benfield, Ed., "HTTP/2", RFC 9113, DOI 10.17487/RFC9113, June 2022, <>.

[HTTP/2] Thomson、M.、ed。and C. Benfield、ed。、「HTTP/2」、RFC 9113、DOI 10.17487/RFC9113、2022年6月、<>。

[HTTP/3] Bishop, M., Ed., "HTTP/3", RFC 9114, DOI 10.17487/RFC9114, June 2022, <>.

[HTTP/3] Bishop、M.、ed。、 "HTTP/3"、RFC 9114、DOI 10.17487/RFC9114、2022年6月、<>。

[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, <>.

[RFC2119] Bradner、S。、「要件レベルを示すためにRFCで使用するためのキーワード」、BCP 14、RFC 2119、DOI 10.17487/RFC2119、1997年3月、<>。

[RFC6455] Fette, I. and A. Melnikov, "The WebSocket Protocol", RFC 6455, DOI 10.17487/RFC6455, December 2011, <>.

[RFC6455] Fette、I。およびA. Melnikov、「The Websocket Protocol」、RFC 6455、DOI 10.17487/RFC6455、2011年12月、<>

[RFC7807] Nottingham, M. and E. Wilde, "Problem Details for HTTP APIs", RFC 7807, DOI 10.17487/RFC7807, March 2016, <>.

[RFC7807]ノッティンガム、M。およびE.ワイルド、「HTTP APIの問題の詳細」、RFC 7807、DOI 10.17487/RFC7807、2016年3月、<>

[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, <>.

[RFC8174] Leiba、B。、「RFC 2119キーワードの大文字と小文字のあいまいさ」、BCP 14、RFC 8174、DOI 10.17487/RFC8174、2017年5月、<>。

[RFC8441] McManus, P., "Bootstrapping WebSockets with HTTP/2", RFC 8441, DOI 10.17487/RFC8441, September 2018, <>.

[RFC8441] McManus、P。、 "HTTP/2でWebStrappetsをブートストラップするWebSocket、RFC 8441、DOI 10.17487/RFC8441、2018年9月、<>。



This document had reviews and input from many contributors in the IETF HTTP and QUIC Working Groups, with substantive input from David Schinazi, Martin Thomson, Lucas Pardue, Mike Bishop, Dragana Damjanovic, Mark Nottingham, and Julian Reschke.

この文書には、IETF HTTPおよびQUICワーキンググループの多くの貢献者からのレビューと意見があり、David Schinazi、Martin Thomson、Lucas Pardue、Mike Bishop、Dragana Damjanovic、Mark Nottingham、Julian Reschkeからの実質的な意見がありました。

Author's Address


Ryan Hamilton Google Email:

Ryan Hamilton Googleメール