BiDirectional or Server-Initiated HTTP (hybi) Concluded WG

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WG Name BiDirectional or Server-Initiated HTTP
Acronym hybi
Area Applications and Real-Time Area (art)
State Concluded
Charter charter-ietf-hybi-02 Approved
Dependencies Document dependency graph (SVG)
More info Tools page
Personnel Chairs Salvatore Loreto
Gabriel Montenegro
Area Director Barry Leiba
Secretary S Moonesamy
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Charter for Working Group

The BiDirectional or Server-Initiated HTTP (HyBi) working group
defines the WebSocket Protocol, a technology for bidirectional
communication between an HTTP client and an HTTP server that
provides greater efficiency than previous approaches (e.g., use
of hanging requests or long polling).

Having completed work on the core protocol (RFC 6455), the group
continues to define extensions for use by WebSocket
implementations. The following extensions and optimizations are
currently in scope:

1. A per-frame compression extension to improve bandwidth
usage (draft-tyoshino-hybi-websocket-perframe-deflate is a
likely starting point).

2. A multiplexing extension to improve the scalability of the
WebSocket protocol (draft-tamplin-hybi-google-mux is a likely
starting point).

3. Timeout-handling capabilities to reduce the chattiness of the
protocol (draft-thomson-hybi-http-timeout is a likely starting

The working group will also serve as a discussion venue for
subprotocols. However, no subprotocol is currently chartered as a
deliverable, and the WG must be rechartered to work on any

The group will not work on an updated version of the WebSocket
protocol, unless it is specifically rechartered to do so.

The group will continue coordinating with the W3C WepApps working
group with respect to the above deliverables and to ensure the best
match possible between the WebSocket protocol and the WebSocket API.
The group will also continue coordinating with other working groups
within the IETF (e.g., HTTPBIS) as appropriate.


Date Milestone
Done Send compression extension to IESG for consideration as a Proposed Standard
Done Issue WG last call on the per-frame compression extension
Done Adopt a WG item for the per-frame compression extension