WebSocket Per-message Compression
draft-ietf-hybi-permessage-compression-01

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HyBi Working Group                                            T. Yoshino
Internet-Draft                                              Google, Inc.
Intended status: Standards Track                         October 1, 2012
Expires: April 4, 2013

                   WebSocket Per-message Compression
               draft-ietf-hybi-permessage-compression-01

Abstract

   This specification defines a WebSocket extension that adds
   compression functionality to the WebSocket Protocol.  It compresses
   the payload of non-control WebSocket messages using specified
   compression algorithm.  One reserved bit RSV1 in the WebSocket frame
   header is allocated to control application of compression for each
   message.  This specification provides one compression method
   available for the 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 April 4, 2013.

Copyright Notice

   Copyright (c) 2012 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  . . . . . . . . . . . . . . . . . . .  6
   4.  Framing  . . . . . . . . . . . . . . . . . . . . . . . . . . .  7
     4.1.  Sending  . . . . . . . . . . . . . . . . . . . . . . . . .  7
     4.2.  Receiving  . . . . . . . . . . . . . . . . . . . . . . . .  7
   5.  DEFLATE method . . . . . . . . . . . . . . . . . . . . . . . .  8
     5.1.  Method Parameters  . . . . . . . . . . . . . . . . . . . .  8
     5.2.  Application Data Transformation  . . . . . . . . . . . . .  9
       5.2.1.  Compression  . . . . . . . . . . . . . . . . . . . . .  9
       5.2.2.  Decompression  . . . . . . . . . . . . . . . . . . . . 10
       5.2.3.  Examples . . . . . . . . . . . . . . . . . . . . . . . 10
     5.3.  Intermediaries . . . . . . . . . . . . . . . . . . . . . . 11
     5.4.  Implementation Notes . . . . . . . . . . . . . . . . . . . 12
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . 13
   7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 14
     7.1.  Registration of the "permessage-compress" WebSocket
           Extension Name . . . . . . . . . . . . . . . . . . . . . . 14
     7.2.  Registration of the "Per-message Compressed" WebSocket
           Framing Header Bit . . . . . . . . . . . . . . . . . . . . 14
     7.3.  WebSocket Per-message Compression Method Name Registry . . 15
   8.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 16
   9.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 17
     9.1.  Normative References . . . . . . . . . . . . . . . . . . . 17
     9.2.  Informative References . . . . . . . . . . . . . . . . . . 17
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 18

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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
   specification defines a WebSocket extension that applies a
   compression algorithm to octets exchanged over the WebSocket Protocol
   using its extension framework.  This extension negotiates what
   compression method to use on opening handshake, and then compresses
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