How to detect is response deliverred to the client?

Hello everybody...
I have problem and don't know how to solve.
My server application runs on apache tomcat 5.5, and deals with some important data transactions.
After getting the request, server has 5 sec. to send response, after that clients will close their sockets.
The connection can be very slow, (GPRS), so it is very possible that transaction will not be over in that time.
I need the way to find out, on my server side, when response isn't get to client in 5 sec.
Is there any idea how to do that?
Sorry if my English is not so perfect.
Thanks

Yes, but that way of write timeout means that write have 5 sec to send buffer to the underlying protocol.
I can't know if TCP succeed or not to deliver data in that short time. I think write is asynchron.
Problem is how to detect when client is disconnect and data are not delivered.
Once again, sorry if my English is not so good.

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