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From Miles Crawford <>
Subject Bug Report - uploads truncated
Date Mon, 05 Feb 2007 23:55:27 GMT

I posted this to the Firefox guys as well, because I believe it may be an issue 
with their browser, but even if it isn't a mod_perl issue perhaps you guys have 
insights I could use to help fill out the bug report I filed with them?

Perl version v5.8.5 for Apache/1.3.33 (Unix) mod_ssl/2.8.23 OpenSSL/0.9.8

When posting a file to the following CGI, as demonstrated at the provided URL,
larger files get truncated.  An example file that truncates is located at:

Notice that this file is about 4mb, but when uploaded through the following CGI
using Firefox 2 on Windows, it is truncated to roughly 2.5mb.

If you look at the truncated files in a hex editor, there is a strange
similarity in the point the file is truncated:

truncated point:
00274fe0:  d6 4c 64 b7 c9 f5 c1 3f  e3 4f a2 8a 28 a2 8a 28  .Ld....?.O..(..(
00274ff0:  a2 8a 28 a2 8a 2b cd 3f  68 9f 0f f8 c3 c6 1f --  ..(..+.?h......-
valid file:
00274fe0:  d6 4c 64 b7 c9 f5 c1 3f  e3 4f a2 8a 28 a2 8a 28  .Ld....?.O..(..(
00274ff0:  a2 8a 28 a2 8a 2b cd 3f  68 9f 0f f8 c3 c6 1f 0a  ..(..+.?h.......
00275000:  75 cf 04 f8 2f 41 4d 46  f7 c4 16 af 66 cc f7 89  u.../AMF....f...

All the files I checked are cut off right before a "0a" byte that rolls over to 
the next round filesize.

I have checked this with Firefox 1.5 and 2.0 on a variety of platforms, and 
have only seen it using Firefox 2.0 on Windows posting to mod_perl 1. mod_perl 
2 doesn't seem to have this problem.


my $r = shift;

use Apache::Request;

my $apr = Apache::Request->new($r);
my $handle = $apr->upload('upload')->fh();

open STORE, ">stored";
while( my $line  = <$handle>){
     print STORE $line;
close STORE;

print "Content-type: text/plain\n\n". `du 'stored'`;

Reproducible: Always

Steps to Reproduce:
1. Upload the sample file to the provided URL or CGI script using Firefox 2.0
on Windows
2.Check the Uploaded filesize.
Actual Results:
Only part of the file is uploaded.

Expected Results:
The whole file should be uploaded ;)

I'm setting the severity to major considering the large number of mod_perl 1.3
applications in production use - Here at the University of Washington we are
getting more and more complaints about this as people upgrade to FF 2.0



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