Applicability of the QUIC Transport Protocol
draft-ietf-quic-applicability-02

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Network Working Group                                      M. Kuehlewind
Internet-Draft                                               B. Trammell
Intended status: Informational                                ETH Zurich
Expires: January 3, 2019                                   July 02, 2018

              Applicability of the QUIC Transport Protocol
                    draft-ietf-quic-applicability-02

Abstract

   This document discusses the applicability of the QUIC transport
   protocol, focusing on caveats impacting application protocol
   development and deployment over QUIC.  Its intended audience is
   designers of application protocol mappings to QUIC, and implementors
   of these application protocols.

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 January 3, 2019.

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   Copyright (c) 2018 IETF Trust and the persons identified as the
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Kuehlewind & Trammell    Expires January 3, 2019                [Page 1]
Internet-Draft             QUIC Applicability                  July 2018

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Notational Conventions  . . . . . . . . . . . . . . . . .   3
   2.  The Necessity of Fallback . . . . . . . . . . . . . . . . . .   3
   3.  Zero RTT  . . . . . . . . . . . . . . . . . . . . . . . . . .   3
     3.1.  Thinking in Zero RTT  . . . . . . . . . . . . . . . . . .   4
     3.2.  Here There Be Dragons . . . . . . . . . . . . . . . . . .   4
     3.3.  Session resumption versus Keep-alive  . . . . . . . . . .   4
   4.  Use of Streams  . . . . . . . . . . . . . . . . . . . . . . .   4
     4.1.  Stream versus Flow Multiplexing . . . . . . . . . . . . .   5
     4.2.  Packetization and latency . . . . . . . . . . . . . . . .   6
     4.3.  Prioritization  . . . . . . . . . . . . . . . . . . . . .   6
   5.  Graceful connection closure . . . . . . . . . . . . . . . . .   6
   6.  Information exposure and the Connection ID  . . . . . . . . .   7
     6.1.  Server-Generated Connection ID  . . . . . . . . . . . . .   7
     6.2.  Using Server Retry for Redirection  . . . . . . . . . . .   8
   7.  Use of Versions and Cryptographic Handshake . . . . . . . . .   8
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   10. Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   9
   11. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   9
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . .   9
     12.1.  Normative References . . . . . . . . . . . . . . . . . .   9
     12.2.  Informative References . . . . . . . . . . . . . . . . .   9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   QUIC [QUIC] is a new transport protocol currently under development
   in the IETF quic working group, focusing on support of semantics as
   needed for HTTP/2 [QUIC-HTTP] such as stream-multiplexing to avoid
   head-of-line blocking.  Based on current deployment practices, QUIC
   is encapsulated in UDP.  The version of QUIC that is currently under
   development will integrate TLS 1.3 [TLS13] to encrypt all payload
   data and most control information.

   This document provides guidance for application developers that want
   to use the QUIC protocol without implementing it on their own.  This
   includes general guidance for application use of HTTP/2 over QUIC as
   well as the use of other application layer protocols over QUIC.  For
   specific guidance on how to integrate HTTP/2 with QUIC, see
   [QUIC-HTTP].

   In the following sections we discuss specific caveats to QUIC's
   applicability, and issues that application developers must consider