Well the change seems to work.  I am using a button that shows an activity
indicator with a veil for the request.  So now that activity indicator and
veil is shown while the file is generated.  But they go away when the file
is downloaded and the user can start clicking the button again.  When the
file download is completed the requests for previous clicks start again.

BTW, I just realized that my code is actually based on your code on

Thanks for putting it up.  Really helpful.

May be you can update it so that it will take care of the problem that I
have.  That is showing the activity indicator during the complete file
generation and download.  

Thanks again.

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