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Posted to bugs@httpd.apache.org by bu...@apache.org on 2007/09/29 03:30:07 UTC
DO NOT REPLY [Bug 43512] New: - mod_deflate fails to inflate
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Summary: mod_deflate fails to inflate
Product: Apache httpd-2
Version: 2.2.6
Platform: Other
OS/Version: Linux
Status: NEW
Severity: major
Priority: P1
Component: mod_deflate
AssignedTo: bugs@httpd.apache.org
ReportedBy: pbelau1@yahoo.com
Inflation fails for certain websites. Appears to be caused by lack of validaton
bytes where they are expected. Commenting out validation bytes checking in
mod_deflate.c does not fix the problem. Size of compressed data is reported as 1
byte in ctx->stream.total_in, uncompressed is 0. Condition can be provoked by
requesting:
www.cnn.com
www.ebay.com
Probably others as well
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DO NOT REPLY [Bug 43512] - mod_deflate fails to inflate
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pbelau1@yahoo.com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|WORKSFORME |
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DO NOT REPLY [Bug 43512] - mod_deflate fails to inflate
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------- Additional Comments From pbelau1@yahoo.com 2007-09-29 11:21 -------
Looking good ! I'll do some more testing and try to wrap my head around what you
did later (seems like a two line fix, but I didn't immediately understand why it
works...)
Good night for now; hope to close out the ticket later. Thanks again.
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DO NOT REPLY [Bug 43512] - mod_deflate fails to inflate
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nick@webthing.com changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |FixedInTrunk
------- Additional Comments From nick@webthing.com 2007-09-29 08:47 -------
Fixed in trunk - r580598. I expect you'll report back whether this fixes it for
you.
Comments:
(1) Easy once I could reproduce the problem.
(2) This is a problem that has affected many filters that worked fine in 2.0
when moving to 2.2.
(3) Sorry about my initial scepticism!
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DO NOT REPLY [Bug 43512] - mod_deflate fails to inflate
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------- Additional Comments From pbelau1@yahoo.com 2007-09-29 03:16 -------
Created an attachment (id=20897)
--> (http://issues.apache.org/bugzilla/attachment.cgi?id=20897&action=view)
httpd config for provoking mod_deflate bug
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rpluem@apache.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |NEEDINFO
------- Additional Comments From rpluem@apache.org 2007-09-29 02:38 -------
Can you please provide the changes that made it work for you as a patch. Even if
this is not the solution is would be helpful for analysis of the problem.
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DO NOT REPLY [Bug 43512] - mod_deflate fails to inflate
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------- Additional Comments From pbelau1@yahoo.com 2007-09-29 03:15 -------
Nick,
In order to duplicate this bug, you need to be using Apache with mod_proxy
enabled and mod_deflate in the filter chain set to INFLATE gzip-ed content.
I'll be attached an httpd.conf for Apache 2.2.6 that provokes the buggy behavior.
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pbelau1@yahoo.com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEEDINFO |NEW
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serai@lans-tv.com changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords|FixedInTrunk |
------- Additional Comments From serai@lans-tv.com 2008-01-19 09:23 -------
2.2 r580916
http://svn.apache.org/viewvc?view=rev&revision=580916
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------- Additional Comments From pbelau1@yahoo.com 2007-09-29 05:20 -------
Another bit of information:
The log output in error_log is Zlib: Validation bytes not present
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------- Additional Comments From covener@gmail.com 2007-09-29 07:23 -------
I was able to reproduce this intermittently (2 requests fail w/ 0 length body,
then a success) with:
LoadModule proxy_module modules/mod_proxy.so
LoadModule proxy_http_module modules/mod_proxy_http.so
LoadModule deflate_module modules/mod_deflate.so
ProxyPass /proxy/ http://www.cnn.com/
LoadModule ext_filter_module modules/mod_ext_filter.so
ExtFilterDefine foo mode=output cmd="/usr/bin/perl -p -e 's/^/|/g'" ftype=21
<location /proxy/>
ExtFilterOptions debuglevel=999
Setoutputfilter INFLATE;foo;DEFLATE
</location>
I sent a request with wget and --header="Accept-Encoding: gzip"
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------- Additional Comments From pbelau1@yahoo.com 2007-09-29 04:31 -------
I'm working on a test case for you, but the bug is really not at all hard to
reproduce. It shows up both with 2.2.6 and TRUNK. Both cnn.com and ebay.com
routinely fail more than 50% of the time with both Firefox 1.5 and 2.0.
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------- Additional Comments From pbelau1@yahoo.com 2007-09-29 05:11 -------
I have been so far unable to reproduce this bug by copying the responses
geneated by by perl IO::Socket to .asis files. In such cases, the files are
rendered perfectly through INFLATE. I will continue my attempts at creating a
better test case but I'm quite exhausted at this point.
Please note that this really is a bug and not a configuration issue. I would be
glad to give someone access to my server if it allows him/her to more
expediently identify that this is indeed a bug and not a figment of my imagination.
Hopefully someone can take a look at this thing in earnest; I have not been
having a pleasant time trying to fix it myself.
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------- Additional Comments From pbelau1@yahoo.com 2007-09-29 03:18 -------
Also, forgot to mention two things:
1. Setting VALIDATON_SIZE to 0 fixes the problem when it pops up
2. Both cnn.com and ebay.com do occasionally send all 8 validation bytes. Please
try making the request a few times before you conclude that there's nothing broken
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pbelau1@yahoo.com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
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nick@webthing.com changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEEDINFO |RESOLVED
Resolution| |WORKSFORME
------- Additional Comments From nick@webthing.com 2007-09-29 03:07 -------
I just tested both www.cnn.com and www.ebay.com (using my apache as forward
proxy and commandline telnet to request uncompressed output), and got the
correctly-uncompressed output.
You've been confusing yourself and scaring the rest of us on IRC for rather a
long time. Perhaps it would be a good idea to revert to a clean 2.2.6 install,
and work from there.
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nick@webthing.com changed:
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Status|REOPENED |NEEDINFO
------- Additional Comments From nick@webthing.com 2007-09-29 03:38 -------
Please set up a testcase for the alleged bug, so I can reproduce it.
You can use mod_asis to set exact headers, as well as the gzipped data.
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