How to detect if a file download was OK

Question

Hi all,
I would like to know if exists any way to detect if a file sent out by a servlet to a browser was succesfully saved on the client.
At least I would be happy to know if the user pressed the "OK" button or the "CANCEL" button
I am sending the file in this standard way:
res.setContentType("application/octet-stream");
res.setHeader("Cache-Control", "public");
filename="testfile.txt";
res.setHeader("Content-disposition","attachment;filename=" + filename);
out = res.getOutputStream();
int len;
while ((len = is.read(buffer)) != -1) {
out.write(buffer, 0, len);
} // end of while
is.close();
out.close();
where res is the javax.servlet.http.HttpServletResponse
buffer is a byte buffer and is a java.io.InputStream
The point is that when this code is executed it reaches the end BEFORE
the user presses any button on the save file dialog box. Perhaps is way the files are little files....
thanks in advance,
Andrea

Answer 1

I don't think so. I mean, you can be sure you sent to the client, but not that the client received it OK