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WebSocket-based server-to-client notifications for the Application-Layer Traffic Optimization (ALTO) Protocol

Document type: Expired Internet-Draft (individual)
Document stream: No stream defined
Last updated: 2014-08-18 (latest revision 2014-02-14)
Intended RFC status: Unknown
Other versions: (expired, archived): plain text, pdf, html

Stream State:No stream defined
Document shepherd: No shepherd assigned

IESG State: Expired
Responsible AD: (None)
Send notices to: No addresses provided

This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found here:


The Application-Layer Traffic Optimization (ALTO) protocol is designed to allow entities with knowledge about the network infrastructure to export such information to applications that need to choose one or more endpoints to connect to among large sets of logically equivalent ones. The base protocol specification adopts a simple pull-based model, according to which the client retrieves the information encoded as JSON objects over HTTP directly from the server. This document proposes (for discussion) a mechanism for providing server-initiated information update notifications through a WebSocket-based ALTO protocol extension that easily integrates in the basic protocol model.


Enrico Marocco <>
Jan Seedorf <>

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid)