Hypertext Transfer Protocol Version 3 (HTTP/3)
draft-ietf-quic-http-22
QUIC M. Bishop, Ed.
Internet-Draft Akamai
Intended status: Standards Track July 09, 2019
Expires: January 10, 2020
Hypertext Transfer Protocol Version 3 (HTTP/3)
draft-ietf-quic-http-22
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.
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 [1].
Working Group information can be found at https://github.com/quicwg
[2]; source code and issues list for this draft can be found at
https://github.com/quicwg/base-drafts/labels/-http [3].
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 January 10, 2020.
Bishop Expires January 10, 2020 [Page 1]
Internet-Draft HTTP/3 July 2019
Copyright Notice
Copyright (c) 2019 IETF Trust and the persons identified as the
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1. Prior versions of HTTP . . . . . . . . . . . . . . . . . 4
1.2. Delegation to QUIC . . . . . . . . . . . . . . . . . . . 4
2. HTTP/3 Protocol Overview . . . . . . . . . . . . . . . . . . 5
2.1. Document Organization . . . . . . . . . . . . . . . . . . 6
2.2. Conventions and Terminology . . . . . . . . . . . . . . . 6
3. Connection Setup and Management . . . . . . . . . . . . . . . 8
3.1. Draft Version Identification . . . . . . . . . . . . . . 8
3.2. Discovering an HTTP/3 Endpoint . . . . . . . . . . . . . 8
3.2.1. QUIC Version Hints . . . . . . . . . . . . . . . . . 9
3.3. Connection Establishment . . . . . . . . . . . . . . . . 9
3.4. Connection Reuse . . . . . . . . . . . . . . . . . . . . 10
4. HTTP Request Lifecycle . . . . . . . . . . . . . . . . . . . 10
4.1. HTTP Message Exchanges . . . . . . . . . . . . . . . . . 10
4.1.1. Header Formatting and Compression . . . . . . . . . . 12
4.1.2. Request Cancellation and Rejection . . . . . . . . . 13
4.1.3. Malformed Requests and Responses . . . . . . . . . . 14
4.2. The CONNECT Method . . . . . . . . . . . . . . . . . . . 14
4.3. Prioritization . . . . . . . . . . . . . . . . . . . . . 15
4.3.1. Placeholders . . . . . . . . . . . . . . . . . . . . 17
4.3.2. Priority Tree Maintenance . . . . . . . . . . . . . . 17
4.4. Server Push . . . . . . . . . . . . . . . . . . . . . . . 18
5. Connection Closure . . . . . . . . . . . . . . . . . . . . . 20
5.1. Idle Connections . . . . . . . . . . . . . . . . . . . . 20
5.2. Connection Shutdown . . . . . . . . . . . . . . . . . . . 20
5.3. Immediate Application Closure . . . . . . . . . . . . . . 22
5.4. Transport Closure . . . . . . . . . . . . . . . . . . . . 22
6. Stream Mapping and Usage . . . . . . . . . . . . . . . . . . 22
6.1. Bidirectional Streams . . . . . . . . . . . . . . . . . . 23
6.2. Unidirectional Streams . . . . . . . . . . . . . . . . . 23
6.2.1. Control Streams . . . . . . . . . . . . . . . . . . . 24
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