Bundled HTTP Exchanges
draft-yasskin-wpack-bundled-exchanges-02

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Network Working Group                                         J. Yasskin
Internet-Draft                                                    Google
Intended status: Standards Track                      September 26, 2019
Expires: March 29, 2020

                         Bundled HTTP Exchanges
                draft-yasskin-wpack-bundled-exchanges-02

Abstract

   Bundled exchanges provide a way to bundle up groups of HTTP
   request+response pairs to transmit or store them together.  They can
   include multiple top-level resources with one identified as the
   default by a manifest, provide random access to their component
   exchanges, and efficiently store 8-bit resources.

Note to Readers

   Discussion of this draft takes place on the wpack mailing list
   (wpack@ietf.org), which is archived at
   https://www.ietf.org/mailman/listinfo/wpack [1].

   The source code and issues list for this draft can be found in
   https://github.com/WICG/webpackage [2].

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
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   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
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   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 March 29, 2020.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Yasskin                  Expires March 29, 2020                 [Page 1]
Internet-Draft           Bundled HTTP Exchanges           September 2019

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Mode of specification . . . . . . . . . . . . . . . . . .   3
   2.  Semantics . . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Stream attributes and operations  . . . . . . . . . . . .   4
     2.2.  Load a bundle's metadata  . . . . . . . . . . . . . . . .   4
       2.2.1.  Load a bundle's metadata from the end . . . . . . . .   5
     2.3.  Load a response from a bundle . . . . . . . . . . . . . .   5
   3.  Format  . . . . . . . . . . . . . . . . . . . . . . . . . . .   6
     3.1.  Top-level structure . . . . . . . . . . . . . . . . . . .   6
     3.2.  Serving constraints . . . . . . . . . . . . . . . . . . .   7
     3.3.  Load a bundle's metadata  . . . . . . . . . . . . . . . .   7
       3.3.1.  Parsing the index section . . . . . . . . . . . . . .  10
       3.3.2.  Parsing the manifest section  . . . . . . . . . . . .  13
       3.3.3.  Parsing the signatures section  . . . . . . . . . . .  14
       3.3.4.  Parsing the critical section  . . . . . . . . . . . .  15
       3.3.5.  The responses section . . . . . . . . . . . . . . . .  16
       3.3.6.  Starting from the end . . . . . . . . . . . . . . . .  16
     3.4.  Load a response from a bundle . . . . . . . . . . . . . .  17
     3.5.  Parsing CBOR items  . . . . . . . . . . . . . . . . . . .  19
       3.5.1.  Parse a known-length item . . . . . . . . . . . . . .  19
       3.5.2.  Parsing variable-length data from a bytestring  . . .  19
       3.5.3.  Parsing the type and argument of a CBOR item  . . . .  20
     3.6.  Interpreting CBOR HTTP headers  . . . . . . . . . . . . .  20
   4.  Guidelines for bundle authors . . . . . . . . . . . . . . . .  21
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  22
     5.1.  Version skew  . . . . . . . . . . . . . . . . . . . . . .  22
     5.2.  Content sniffing  . . . . . . . . . . . . . . . . . . . .  22
   6.  IANA considerations . . . . . . . . . . . . . . . . . . . . .  23
     6.1.  Internet Media Type Registration  . . . . . . . . . . . .  23
     6.2.  Web Bundle Section Name Registry  . . . . . . . . . . . .  24
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  25
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .  25
     7.2.  Informative References  . . . . . . . . . . . . . . . . .  27