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From eric leung <chiu0...@yahoo.com>
Subject Re: acknowledgment from web client
Date Thu, 19 Apr 2001 17:18:08 GMT
To make it clear:
My question is how server (SERVLET) knows if (web
browser) finish download 100% of the file. 

If user had downloaded the whole file. user cannot
re-download the file again.  If user click cancel in
the middle or didn't download 100% of a file -->
server will knows it and user can download it again.

Thanks.

--- eric leung <chiu02us@yahoo.com> wrote:
> Hi,
> I have a servlet serves files for web browser.
> 
> How can I know if the HTTP web browser had:
> 1) finished download 100% of the file, or;
> 2) only downloaded 50% of the file then click
> cancel,
> or;
> 3) only downloaded 70% then reboot the machine
> 
> i think the TCP/IP layer (socket) will keep track of
> acknowlegament send back from client. but how do i
> implement this in my servlet? how do i (servlet)
> know
> how many bytes client had receive? 
> 
> I am now using apache + tomcat.  I heard tomcat has
> problem getting  acknowlegament from client. since
> tomcat is seperated by apache server from client
> (it's
> a tomcat bug also). Any one knows how to fix this
> problem?   
> Web-browser --> apache --> tomcat
> 
> thanks.
> 
> 
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