- From: Klaus H. Wolf <wolf@informatik.uni-ulm.de>
- Date: Tue, 22 Jun 1999 17:56:57 +0200
- To: Fisher Mark <fisherm@tce.com>
- CC: http-wg@cuckoo.hpl.hp.com
I am working in the Internet Presence and Instant Messages field. As you know, presence needs asynchonous notifications as well. We are using a protocol for 2 years now which does: 1) subscriptions from client to server 2) notifications from server to client w/o open connection 3) if 2) is not possible, it uses a Unix-select-like mechanism thru HTTP with open connection. Notifications travel from server to client while TCP connections are established from client to sever. You might have a look into the Internet-Draft: draft-wolf-vpp-01.txt. Search for NOTIFY and SELECT. Or: go to http://rr-vs.informatik.uni-ulm.de/rr/ and watch the TCP traffic between Java applet and server. Everything is encapsulated into HTTP request-response transactions to be HTTP-proxy compatible. We are very happy with the select-mechanism. Tell me, if you need more information. I can write an Internet Draft. Planned this anyway since the HTTP-SELECT experience could be valuable for others as well. -- Klaus H. Wolf Voice: +49 (731) 502 4145 Distributed Systems Dept. Ethernet: 08:00:20:12:2a:01 University of Ulm Cobrow: http://www.cobrow.com/ 89069 Ulm, Germany Live: http://www.cobrow.com/pages/people/wolf.html
Received on Tuesday, 22 June 1999 09:01:04 UTC