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From Tecno Brain <>
Subject Re: Tomcat unaware that connection has been dropped
Date Thu, 09 Jul 2015 09:04:47 GMT
I forgot to mention, the Amazon ELB is configured to handle the SSL
encryption, although perhaps is not relevant.

On Thu, Jul 9, 2015 at 1:52 AM, Tecno Brain <>

> I am running Tomcat 8.0.20 in Ubuntu with Java 1.8u45
> This server runs in Amazon EC2 behind an ELB (load balancer), although the
> cluster size is just one server.
> My application allows to download some data in CSV format.
> The CSV data is generated on the fly, and there is no way to known in
> advance the size of the response. So, the data is an attachment.
>  response.setContentType("text/csv;charset=utf-8");
>  filename = "data.csv"
>  response.setHeader("Content-Disposition", "attachment; filename=\"" +
> filename + ".csv\"");
> The download starts immediately but after 100 MB the browser stopped
> received data -my internet connection was not the best-, so I canceled the
> download as it was not progressing anymore.
> Nevertheless, my web app keeps generating the CSV data, unaware that the
> connection has been dropped. I was expecting that my code would get an
> IOException when writing to the servlet OutputStream (which was wrapped by
> a BufferedOutputStream and wrapped by an OutputStreamWriter).
> Is this a problem I can solve through the configuration of the NIO
> connector ?
> Or is this a problem of Amazon ELB that still consumes the stream even
> though it can't be forwarded to the browser anymore?
> I don't remember having this problem when working with Apache HTTP as the
> load balancer. If I remember correctly, I would get an error indicating
> that the client closed the connection.
> Any pointers are appreciated.
> -Jorge

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