Compression Extensions for WebSocket
draft-ietf-hybi-permessage-compression-07
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HyBi Working Group T. Yoshino
Internet-Draft Google, Inc.
Intended status: Standards Track March 19, 2013
Expires: September 20, 2013
Compression Extensions for WebSocket
draft-ietf-hybi-permessage-compression-07
Abstract
This document specifies a framework for creating WebSocket extensions
that add compression functionality to the WebSocket Protocol. An
extension based on this framework compresses the payload data portion
of non-control WebSocket messages on per-message basis using
parameters negotiated during the opening handshake. This framework
provides a general method to apply a compression algorithm to the
contents of WebSocket messages. For each compression algorithm, an
extension is defined by specifying parameter negotiation and
compression algorithm in detail. This document also specifies one
specific compression extension using the DEFLATE algorithm.
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
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on September 20, 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
Yoshino Expires September 20, 2013 [Page 1]
Internet-Draft Compression Extensions for WebSocket March 2013
(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
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 and Terminology . . . . . . . . . . . 4
3. WebSocket Per-message Compression Extension . . . . . . . . . 5
4. Extension Negotiation . . . . . . . . . . . . . . . . . . . . 6
4.1. Negotiation Examples . . . . . . . . . . . . . . . . . . . 7
5. Framing . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.1. Sending . . . . . . . . . . . . . . . . . . . . . . . . . 8
5.2. Receiving . . . . . . . . . . . . . . . . . . . . . . . . 9
6. permessage-deflate extension . . . . . . . . . . . . . . . . . 10
6.1. Method Parameters . . . . . . . . . . . . . . . . . . . . 11
6.1.1. Context Takeover Control . . . . . . . . . . . . . . . 11
6.1.2. Limiting the LZ77 sliding window size . . . . . . . . 11
6.1.3. Example . . . . . . . . . . . . . . . . . . . . . . . 12
6.2. Payload Data Transformation . . . . . . . . . . . . . . . 13
6.2.1. Compression . . . . . . . . . . . . . . . . . . . . . 13
6.2.2. Decompression . . . . . . . . . . . . . . . . . . . . 14
6.2.3. Examples . . . . . . . . . . . . . . . . . . . . . . . 15
6.3. Intermediaries . . . . . . . . . . . . . . . . . . . . . . 18
6.4. Implementation Notes . . . . . . . . . . . . . . . . . . . 18
7. Security Considerations . . . . . . . . . . . . . . . . . . . 19
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 20
8.1. Registration of the "permessage-deflate" WebSocket
Extension Name . . . . . . . . . . . . . . . . . . . . . . 20
8.2. Registration of the "Per-message Compressed" WebSocket
Framing Header Bit . . . . . . . . . . . . . . . . . . . . 20
9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 21
10. References . . . . . . . . . . . . . . . . . . . . . . . . . . 22
10.1. Normative References . . . . . . . . . . . . . . . . . . . 22
10.2. Informative References . . . . . . . . . . . . . . . . . . 22
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 23
Yoshino Expires September 20, 2013 [Page 2]
Internet-Draft Compression Extensions for WebSocket March 2013
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