Hypertext Transfer Protocol Version 3 (HTTP/3)
draft-ietf-quic-http-34

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QUIC                                                      M. Bishop, Ed.
Internet-Draft                                                    Akamai
Intended status: Standards Track                         2 February 2021
Expires: 6 August 2021

             Hypertext Transfer Protocol Version 3 (HTTP/3)
                        draft-ietf-quic-http-34

Abstract

   The QUIC transport protocol has several features that are desirable
   in a transport for HTTP, such as stream multiplexing, per-stream flow
   control, and low-latency connection establishment.  This document
   describes a mapping of HTTP semantics over QUIC.  This document also
   identifies HTTP/2 features that are subsumed by QUIC, and describes
   how HTTP/2 extensions can be ported to HTTP/3.

DO NOT DEPLOY THIS VERSION OF HTTP

   DO NOT DEPLOY THIS VERSION OF HTTP/3 UNTIL IT IS IN AN RFC.  This
   version is still a work in progress.  For trial deployments, please
   use earlier versions.

Note to Readers

   Discussion of this draft takes place on the QUIC working group
   mailing list (quic@ietf.org), which is archived at
   https://mailarchive.ietf.org/arch/search/?email_list=quic.

   Working Group information can be found at https://github.com/quicwg;
   source code and issues list for this draft can be found at
   https://github.com/quicwg/base-drafts/labels/-http.

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."

Bishop                    Expires 6 August 2021                 [Page 1]
Internet-Draft                   HTTP/3                    February 2021

   This Internet-Draft will expire on 6 August 2021.

Copyright Notice

   Copyright (c) 2021 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 Simplified BSD License text
   as described in Section 4.e of the Trust Legal Provisions and are
   provided without warranty as described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
     1.1.  Prior versions of HTTP  . . . . . . . . . . . . . . . . .   5
     1.2.  Delegation to QUIC  . . . . . . . . . . . . . . . . . . .   5
   2.  HTTP/3 Protocol Overview  . . . . . . . . . . . . . . . . . .   5
     2.1.  Document Organization . . . . . . . . . . . . . . . . . .   6
     2.2.  Conventions and Terminology . . . . . . . . . . . . . . .   7
   3.  Connection Setup and Management . . . . . . . . . . . . . . .   8
     3.1.  Discovering an HTTP/3 Endpoint  . . . . . . . . . . . . .   8
       3.1.1.  HTTP Alternative Services . . . . . . . . . . . . . .   9
       3.1.2.  Other Schemes . . . . . . . . . . . . . . . . . . . .  10
     3.2.  Connection Establishment  . . . . . . . . . . . . . . . .  10
     3.3.  Connection Reuse  . . . . . . . . . . . . . . . . . . . .  11
   4.  HTTP Request Lifecycle  . . . . . . . . . . . . . . . . . . .  12
     4.1.  HTTP Message Exchanges  . . . . . . . . . . . . . . . . .  12
       4.1.1.  Field Formatting and Compression  . . . . . . . . . .  14
       4.1.2.  Request Cancellation and Rejection  . . . . . . . . .  17
       4.1.3.  Malformed Requests and Responses  . . . . . . . . . .  18
     4.2.  The CONNECT Method  . . . . . . . . . . . . . . . . . . .  19
     4.3.  HTTP Upgrade  . . . . . . . . . . . . . . . . . . . . . .  21
     4.4.  Server Push . . . . . . . . . . . . . . . . . . . . . . .  21
   5.  Connection Closure  . . . . . . . . . . . . . . . . . . . . .  23
     5.1.  Idle Connections  . . . . . . . . . . . . . . . . . . . .  23
     5.2.  Connection Shutdown . . . . . . . . . . . . . . . . . . .  24
     5.3.  Immediate Application Closure . . . . . . . . . . . . . .  26
     5.4.  Transport Closure . . . . . . . . . . . . . . . . . . . .  26
   6.  Stream Mapping and Usage  . . . . . . . . . . . . . . . . . .  27
     6.1.  Bidirectional Streams . . . . . . . . . . . . . . . . . .  27
     6.2.  Unidirectional Streams  . . . . . . . . . . . . . . . . .  28
       6.2.1.  Control Streams . . . . . . . . . . . . . . . . . . .  29