Abort a download

[muriwai]

Hi,

I manually stream out a file in chunks from my web form using PageAsyncTask,
Page.Response.OutputStream.BeginWrite and Flush after each chunk. I do set
the Content-Length header. If an error occurs (for example, a timeout), I do
the following:
response.OutputStream.Close();
response.Flush();
response.Close();

The trouble is, IE says that the download has completed successfully in
spite of the downloded file being incomplete. How can I force IE to display
an error (eg, Connection Was Reset) and abort the download?

Thanks!
--

 

[Michael Nemtsev]

Hello muriwai,

See there the list of conversion libs http://csharp-source.net/open-source/pdf-libraries

---
WBR, Michael Nemtsev [.NET/C# MVP].
My blog: http://spaces.live.com/laflour
Team blog: http://devkids.blogspot.com/

"The greatest danger for most of us is not that our aim is too high and we
miss it, but that it is too low and we reach it" (c) Michelangelo

m> Hi,
m>
m> I manually stream out a file in chunks from my web form using
m> PageAsyncTask,
m> Page.Response.OutputStream.BeginWrite and Flush after each chunk. I
m> do set
m> the Content-Length header. If an error occurs (for example, a
m> timeout), I do
m> the following:
m> response.OutputStream.Close();
m> response.Flush();
m> response.Close();
m> The trouble is, IE says that the download has completed successfully
m> in spite of the downloded file being incomplete. How can I force IE
m> to display an error (eg, Connection Was Reset) and abort the
m> download?
m>
m> Thanks!
m>

 

[Michael Nemtsev]

Hello Michael ,

Emm, sorry, missed the tread

---
WBR, Michael Nemtsev [.NET/C# MVP].
My blog: http://spaces.live.com/laflour
Team blog: http://devkids.blogspot.com/

"The greatest danger for most of us is not that our aim is too high and we
miss it, but that it is too low and we reach it" (c) Michelangelo

MN> See there the list of conversion libs
MN> http://csharp-source.net/open-source/pdf-libraries
MN>

 

[Steven Cheng[MSFT]]

Hi Michael,

Based on my test, when you turn off buffer of the page resposne, it will
write out response headers at initial flush so that after the server-side
close or terminate the connection, the client-side will just act like the
response output finished. I've tried through exception or abort response or
worker thread but haven't got any effect. I think this due to the ASP.NET's
control over response is at a high application level that doen't deep
enough for the raw HTTP communication. For your scenario, you may consider
some IIS isapi filter solution as it can help much more control over the
underlying http communication.

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead



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[muriwai]

Hi Steven,

This looks like a bug in Internet Explorer when it offers an incomplete
download to a user, even though Content-Length does not match the actual
file length. According to
http://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.4, Content-Length
takes precedence over the server closing the connection. I'd pass this along
to the IE team.

Thanks

 

[Steven Cheng[MSFT]]

Hi Michael,

Yes, most url length or some non-http specific features will be defined by
client browser. So for this problem, you've also tested it on other
browsers? Also, you can post in some IE general discussion newsgroup for
some further idea on this.

Sincerely,

Steven Cheng

Microsoft MSDN Online Support Lead


This posting is provided "AS IS" with no warranties, and confers no rights.