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Keeping count of downloaded file

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I have written a servlet for downloading file from the webpage. This servlet updates the total number of downloads once the download is successfully completed. I am using outputstream of the response to write the data into. The problem is when I click the href link in the browser (Either firefox or ie) the browser displays a dialogbox asking me to either open the file using a program or to save in a location. But in the meantime the server is sending data to the client's system. So if the file size is small, say 2KB then the download is already finished till I press OK or Cancel in the dialogbox. Thus even if the client presses cancel button of the dialog box the servlet has incremented the number of downloads for the file, which is wrong.

Therefore I want that the download should start only when the user clicks on the OK button of the dialogbox.

Please help me out.
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You are not going to be able to change the browser's behavior.
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