Unbound Server Push (USP) for HTTP/QUIC
draft-pardue-quic-http-unbound-server-push-00

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Network Working Group                                          L. Pardue
Internet-Draft                                BBC Research & Development
Intended status: Informational                          January 29, 2018
Expires: August 2, 2018

                Unbound Server Push (USP) for HTTP/QUIC
             draft-pardue-quic-http-unbound-server-push-00

Abstract

   This document defines an HTTP semantic extension, Unbound Server Push
   (USP), which allows HTTP resources to be pushed without the need for
   a prior HTTP request.  HTTP/QUIC clients opt in to this feature via
   an HTTP/QUIC setting.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on August 2, 2018.

Copyright Notice

   Copyright (c) 2018 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
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Notational Conventions  . . . . . . . . . . . . . . . . .   3
   2.  The SETTINGS_ENABLE_UNBOUND_PUSH Parameter  . . . . . . . . .   3
   3.  Usage of Unbound Server Push  . . . . . . . . . . . . . . . .   3
   4.  0-RTT Considerations  . . . . . . . . . . . . . . . . . . . .   4
   5.  Handling Multiple Clients . . . . . . . . . . . . . . . . . .   4
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
     7.1.  Registration of SETTINGS_ENABLE_UNBOUND_PUSH parameter  .   4
   8.  Normative References  . . . . . . . . . . . . . . . . . . . .   4
   Appendix A.  Acknowledgements . . . . . . . . . . . . . . . . . .   5
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   HTTP server push is a feature of HTTP/2 [RFC7540] and HTTP/QUIC
   [QUIC-HTTP] that allows a server to pre-emptively send HTTP resources
   to a client in association with a previous client-initiated request.
   This binding to a request object aligns with paradigms familiar to
   client and server implementations.  Unbound server push, in contrast,
   may provide benefits for use cases where holding a request object
   open for long periods (long polling) is undesirable, or where a
   request object does not exist (unidirectional flows).  (The
   introduction of unidirectional streams in the QUIC transport
   [QUIC-TRANSPORT] provides a direct expression of this message
   exchange pattern.)

   This document defines an HTTP/QUIC protocol extension that allows a
   server to send an HTTP/QUIC "PUSH_PROMISE" frame on a server-
   initiated unidirectional stream.  Endpoints opt in to the unbound
   server push feature using a "SETTINGS" parameter (Section 2) in
   accordance with Section 5.5 of [RFC7540].  This is the only
   behavioural change to server push as described in [QUIC-HTTP].
   Unbound server push operates in addition to bound server push for any
   HTTP/QUIC connection.

   Unbound server push should used with care.  It may introduce
   complexities for implementations, particularly intermediaries, and it
   can pose challenges for presentation to the application above HTTP.

   In deployments where multiple client connections are trunked by a
   reverse proxy onto a single upstream connection, unbound server push
   is effectively a mechanism for achieving application-level multicast
   to all downstream clients that have enabled this feature.

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      *Authors' Note:* Unbound server push is proposed as an extension
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