[JDEV] Detecting client/server disconnect?

Jens Alfke jens at mac.com
Mon Apr 9 12:44:48 CDT 2001

On Friday, April 6, 2001, at 03:40 PM, Oliver Jones wrote:

> Winjab works around this problem.  It sends, once a minute, the five 
> byte no-op message
>    space space tab space space
> to the server.  This keeps the flow open.  In xml terms, this message 
> is formally a noop; very cool.

This is a clever hack! Is there something magic about "space space tab 
space space" or would any whitespace sequence work?

On the other hand, using TCP keepalive seems more efficient, since 
responding to pings would involve only the TCP stack on the server and 
not the Jabber server process itself. If you imagine a server with 
10,000 simultaneous connections, there are going to be 167 of these 
pings a second, so efficiency becomes important...

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