The Mercure Protocol
draft-dunglas-mercure-07

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Network Working Group                                         K. Dunglas
Internet-Draft                                         Les-Tilleuls.coop
Intended status: Standards Track                             8 July 2020
Expires: 9 January 2021

                          The Mercure Protocol
                        draft-dunglas-mercure-07

Abstract

   Mercure is a protocol enabling the pushing of data updates to web
   browsers and other HTTP clients in a fast, reliable and battery-
   efficient way.  It is especially useful for publishing real-time
   updates of resources served through web APIs to web and mobile apps.

Status of This Memo

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   This Internet-Draft will expire on 9 January 2021.

Copyright Notice

   Copyright (c) 2020 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Dunglas                  Expires 9 January 2021                 [Page 1]
Internet-Draft            The Mercure Protocol                 July 2020

Table of Contents

   1.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Discovery . . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Content Negotiation . . . . . . . . . . . . . . . . . . .   5
   3.  Topic Selectors . . . . . . . . . . . . . . . . . . . . . . .   6
   4.  Subscription  . . . . . . . . . . . . . . . . . . . . . . . .   7
   5.  Publication . . . . . . . . . . . . . . . . . . . . . . . . .   8
   6.  Authorization . . . . . . . . . . . . . . . . . . . . . . . .  10
     6.1.  Publishers  . . . . . . . . . . . . . . . . . . . . . . .  11
     6.2.  Subscribers . . . . . . . . . . . . . . . . . . . . . . .  12
     6.3.  Payload . . . . . . . . . . . . . . . . . . . . . . . . .  13
   7.  Reconnection, State Reconciliation and Event Sourcing . . . .  13
   8.  Active Subscriptions  . . . . . . . . . . . . . . . . . . . .  14
     8.1.  Subscription Events . . . . . . . . . . . . . . . . . . .  15
     8.2.  Subscription API  . . . . . . . . . . . . . . . . . . . .  16
   9.  JSON-LD Context . . . . . . . . . . . . . . . . . . . . . . .  20
   10. Encryption  . . . . . . . . . . . . . . . . . . . . . . . . .  20
   11. IANA Considerations . . . . . . . . . . . . . . . . . . . . .  21
     11.1.  Well-Known URIs Registry . . . . . . . . . . . . . . . .  21
     11.2.  Link Relation Types Registry . . . . . . . . . . . . . .  21
     11.3.  JSON Web Token (JWT) Registry  . . . . . . . . . . . . .  21
   12. Security Considerations . . . . . . . . . . . . . . . . . . .  22
   13. Implementation Status . . . . . . . . . . . . . . . . . . . .  23
     13.1.  Mercure.rocks Hub  . . . . . . . . . . . . . . . . . . .  23
     13.2.  Ilshidur/node-mercure  . . . . . . . . . . . . . . . . .  24
     13.3.  Symfony  . . . . . . . . . . . . . . . . . . . . . . . .  25
     13.4.  API Platform . . . . . . . . . . . . . . . . . . . . . .  26
     13.5.  Laravel Mercure Broadcaster  . . . . . . . . . . . . . .  26
     13.6.  dart_mercure . . . . . . . . . . . . . . . . . . . . . .  27
     13.7.  pymercure  . . . . . . . . . . . . . . . . . . . . . . .  28
     13.8.  Amphp Mercure Publisher  . . . . . . . . . . . . . . . .  29
     13.9.  Java Library for Mercure . . . . . . . . . . . . . . . .  30
     13.10. Yii 2 Mercure behavior . . . . . . . . . . . . . . . . .  31
     13.11. GitHub Action for Mercure  . . . . . . . . . . . . . . .  31
     13.12. Other Implementations  . . . . . . . . . . . . . . . . .  32
   14. Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  32
   15. Normative References  . . . . . . . . . . . . . . . . . . . .  32
   16. Informative References  . . . . . . . . . . . . . . . . . . .  33
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .  35

1.  Terminology