I did it in such way

class Download:
    def GET(self, id):
            web.header('Content-Type', attachment.type) # file type
            web.header('Content-disposition', 'attachment; filename='
+ attachment.file_name) # force browser to show "Save as" dialog.
            return data # your blob

> and how to process the mime?
When you upload file, FieldStorage instance contains mime type in
"type" property.

On Sat, Jan 8, 2011 at 7:02 PM, Yunfan Jiang <jyf1...@gmail.com> wrote:
> i want to make a file download site by web.py
> and the file content which i store in database using blob, so how can
> i response the file value to user?  and how to process the mime?
>
> --
> welcom to gtalk me
> http://hi.baidu.com/jyf1987
>
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-- 
Best regards,
Sergei Sadovski

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