Hi,

You cannot. At least not within the bounds of standard HTTP- / Servlet- /
JSP-based Web Applications.

HTTP is strictly a client-driven protocol. There is no persistent
connection between the server and the client that could be used to send
unsolicited notifications to clients. About the best you can do is record
in the server an indication that the server will be going down in the near
future (perhaps an indication of the actual time at which the shut-down
will occur). Then Web Apps or pages that want to notify the user of the
pending shut-down can interrogate that internal status indication and
alter, amend or replace their usual response with one that includes the
upcoming shutdown notice.

Randall Schulz
Mountain View, CA USA


At 19:41 2002-08-20, KL OOI wrote:
>Hi all,
>
>I have an application running on Tomcat. If I want to shutdown for
>maintenance. How do I broadcast a message to all the on-line user ?
>Kindly provide any pointer if possible.
>
>Thanks.
>
>Regards,
>KL

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