WebSocket Per-message Compression
draft-ietf-hybi-permessage-compression-05

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HyBi Working Group                                            T. Yoshino
Internet-Draft                                              Google, Inc.
Intended status: Standards Track                        January 24, 2013
Expires: July 28, 2013

                   WebSocket Per-message Compression
               draft-ietf-hybi-permessage-compression-05

Abstract

   This document specifies a framework for creating WebSocket extensions
   that add compression functionality to the WebSocket Protocol.
   Extensions based on this framework compress the payload of non-
   control WebSocket messages using a specified compression algorithm.
   One reserved bit RSV1 in the WebSocket frame header is allocated to
   control application of compression for each message.  This document
   also specifies one specific compression extension using DEFLATE.

   Please send feedback to the hybi@ietf.org mailing list.

Status of this Memo

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

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on July 28, 2013.

Copyright Notice

   Copyright (c) 2013 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
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect

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   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Conformance Requirements . . . . . . . . . . . . . . . . . . .  4
   3.  Extension Negotiation  . . . . . . . . . . . . . . . . . . . .  5
     3.1.  Negotiation Example  . . . . . . . . . . . . . . . . . . .  5
   4.  Framing  . . . . . . . . . . . . . . . . . . . . . . . . . . .  7
     4.1.  Sending  . . . . . . . . . . . . . . . . . . . . . . . . .  7
     4.2.  Receiving  . . . . . . . . . . . . . . . . . . . . . . . .  7
   5.  permessage-deflate extension . . . . . . . . . . . . . . . . .  8
     5.1.  Method Parameters  . . . . . . . . . . . . . . . . . . . .  8
       5.1.1.  Disallow compression context takeover  . . . . . . . .  8
       5.1.2.  Limit maximum LZ77 sliding window size . . . . . . . .  9
       5.1.3.  Example  . . . . . . . . . . . . . . . . . . . . . . . 10
     5.2.  Application Data Transformation  . . . . . . . . . . . . . 10
       5.2.1.  Compression  . . . . . . . . . . . . . . . . . . . . . 10
       5.2.2.  Decompression  . . . . . . . . . . . . . . . . . . . . 11
       5.2.3.  Examples . . . . . . . . . . . . . . . . . . . . . . . 12
     5.3.  Intermediaries . . . . . . . . . . . . . . . . . . . . . . 14
     5.4.  Implementation Notes . . . . . . . . . . . . . . . . . . . 15
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . 16
   7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 17
     7.1.  Registration of the "permessage-deflate" WebSocket
           Extension Name . . . . . . . . . . . . . . . . . . . . . . 17
     7.2.  Registration of the "Per-message Compressed" WebSocket
           Framing Header Bit . . . . . . . . . . . . . . . . . . . . 17
   8.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 18
   9.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 19
     9.1.  Normative References . . . . . . . . . . . . . . . . . . . 19
     9.2.  Informative References . . . . . . . . . . . . . . . . . . 19
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 20

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1.  Introduction

   _This section is non-normative._

   As well as other communication protocols, the WebSocket Protocol
   [RFC6455] can benefit from compression technology.  This document
   specifies a framework for creating WebSocket extensions that apply a
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