250003 - Downloads silently truncated when using HTTP proxy.

Status: VERIFIED DUPLICATE of bug 262179

(Toolkit :: Downloads API, defect)

Description

[Bob Rusbasan]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7) Gecko/20040626 Firefox/0.9.1
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.7) Gecko/20040626 Firefox/0.9.1

When using Mozilla Firefox 0.9 or 0.9.1 to download files on a computer using an
HTTP proxy, often the file is truncated.  It seems the larger the file is, the
more likely this is to happen.  No error is reported or anything.  The download
manager just says it's (for example) 23% done one instant, then suddenly claims
it's complete, but the resulting file is too small.

Reproducible: Sometimes
Steps to Reproduce:
1.  Start downloading a large file (OpenOffice.org, for example) through an HTTP
proxy.  Note the size it's supposed to be.
2.  When the download is complete, see if the file is the correct size.  Repeat
until failure (usually does not take many tries).  Note that you'll have to
clear your cache and/or delete the file if downloading the same file from the
same server.

Actual Results:  
Mozilla Firefox reported the download had successfully completed but the file
size was too small.

Expected Results:  
Downloaded the complete file or at least alerted me to the fact that there was a
problem.  It should not have removed the ".part" suffix from the downloaded file
(thereby inaccurately indicating the download had completed successfully).

While it's possible that there is something wrong with the configuration of the
HTTP proxy I'm using, I think in a way that's irrevelant.  Mozilla Firefox knows
the size of the file it's downloading and so should make sure the file it gets
is the correct size.  At the very least the user should be alerted to the issue
when this is not the case.

Interestingly, if the download is truncated and I try to download that same file
again it will actually pick up where it left off.  So by repeatedly downloading
the same file from the same server I can eventually get an untruncated version.  

What is frustrating is that it knows the file is the wrong size AND knows how to
resume the download and yet I'm getting truncated files all the time.

Comment 1

[Bob Rusbasan]

This is still an issue.  I just tried to download the Windows XP Service Pack 2,
which is about 272 MB, and it told me the download was completed after it had
downloaded 37 MB.  Why can't Mozilla be smart enough to not see that downloads
that don't get all the bytes promised (in this case about 15% of them) are not
really complete?  At least there should be an error.

Comment 2

[Jesiah S]

What proxy server and version are you using?  Anything special about it?
Try using HTTP/1.0 version to acces your proxy. Goto about:config and filter for
http.proxy and change network.http.proxy.version to 1.0.

OT: I would suggest upgrading FF as there has been some security problems.

Comment 3

[Mika Fischer]

I have this problemm as well.

Mozilla/5.0 (X11; U; Linux i686; de-DE; rv:1.7.10) Gecko/20050728 Firefox/1.0.4
(Ubuntu package 1.0.6)

Let me know if I can help to debugging this.

I think the problem showed up recently and it used to work before...

Comment 4

[Michael Robinson]

This is a duplicate of Bug 262179

Comment 5

[Serge Gautherie (:sgautherie)]

(1.5+ years later)

Initial reporter never replied to comment 2.
Comment 3 reporter did not give any detail (either).

Moreover, it was never said clearly what the behavior was without a proxy.

V.Duplicate, per comment 4.