Internet Engineering Task Force (IETF) S. Loreto Request for Comments: 6202 Ericsson Category: Informational P. Saint-Andre ISSN: 2070-1721 Cisco S. Salsano University of Rome "Tor Vergata" G. Wilkins Webtide April 2011 Abstract On today's Internet, the Hypertext Transfer Protocol (HTTP) is often used (some would say abused) to enable asynchronous, "server- initiated" communication from a server t

