Last Comment Bug 145392 - some images do not load [apache CGI pipelining problem]
: some images do not load [apache CGI pipelining problem]
: topembed-
Product: Core
Classification: Components
Component: Networking (show other bugs)
: Trunk
: All All
-- normal (vote)
: ---
Assigned To: Nobody; OK to take it and work on it
: Patrick McManus [:mcmanus]
Depends on:
Blocks: grouper
  Show dependency treegraph
Reported: 2002-05-17 17:53 PDT by Darin Fisher
Modified: 2015-12-23 14:12 PST (History)
8 users (show)
See Also:
Crash Signature:
QA Whiteboard:
Iteration: ---
Points: ---
Has Regression Range: ---
Has STR: ---


Description User image Darin Fisher 2002-05-17 17:53:31 PDT
some images do not load when the images are all served up via the same CGI
script. apache seems to have difficulty with pipelined requests to the same CGI
script, and it seems to fail in a way that is not recoverable.  we may have to
work around this bug by verifying that each pipelined request is for a unique
URL (minus the query and/or fragment).
Comment 1 User image joakim_46 2002-05-17 18:24:03 PDT
WFM with build 2002051006. Reporter, please try with a newer build.
Comment 2 User image Darin Fisher 2002-05-17 18:38:17 PDT
try enabling pipelining in 'Preferences->Advanced->HTTP Networking' ... you will
see the bug.
Comment 3 User image Dave 2002-05-17 23:29:48 PDT
If you have pipelining enabled, then might this bug be a dupe of Bug 140561? 
(also see Bug 141179)
Comment 4 User image Darin Fisher 2002-05-20 09:28:12 PDT
yup, this bug might be a dup of those other bugs, or it might not be.  i have to
investigate the cause of those bugs to know for certain.
Comment 5 User image a_geek 2002-08-03 11:12:21 PDT

I'm unsure about this. With build 2002060721 (linux) I control both client and
server, and serve the images via an Apache ErrorDocument redirection. With
respect to _this_ bug (there are other problems as well, all not experienced
with Netscape 4.77) some images load, others don't, and the log contains:

(date) [info] [client x.x.x.x (32)Broken pipe: client stopped connection before
rflush completed

Some of the image doesn't load. Reloading the page several times yields
that sometimes eg. pictures 1, 3 and 7 load, while on a different attemt
pictures 1, 2, 3, and 6 load. Sometimes not even all requests are logged
in the error log where I usually find "File does not exist: /path/to/img.png"
(for example, with the path refering to the directory where the error
document is set up).

If this is a client or server problem, I don't know.

This is Apache 1.2.24+SSL as in OBSD 3.1 -stable (ie, patched for
chunked encoding and SSH/SSL problems) on the server side.

Btw, I have pipelining _OFF_.

Any hints on where to look (and how to correct this) are welcome!
Comment 6 User image Darin Fisher 2002-08-05 10:55:13 PDT sounds like you're describing a different bug.  this bug is only
concerned with apache 1.3's problem with pipelined requests to CGI scripts. 
that said, you're welcome to file a new bug on the problem you're seeing, but
please try to provide a testcase so mozilla developers will be able to reproduce
the problem you are seeing.  thx!!
Comment 7 User image Marek Z. Jeziorek 2002-09-13 09:58:45 PDT
batch: adding topembed per Gecko2 document
Comment 8 User image David G King 2002-10-01 14:11:45 PDT
Using the test URL, this WFM with build 20021001 on WinXP SP1.
Comment 9 User image Michael Buckland 2003-05-05 13:47:09 PDT
Discussed in topembed bug triage.  Minusing.
Comment 10 User image Darin Fisher 2006-06-21 16:18:17 PDT
-> default owner
Comment 11 User image John Vandenberg 2010-10-01 01:34:03 PDT
The old server ( no longer exists.  netcraft says it was running Apache/1.3.12 and then Apache/1.3.26 with mod_throttle/3.1.2

Could it have been running mod_throttle at the time this bug was reported?

The new server ( is running Apache/2.2.3 (Red Hat) so it isn't a valid test for this bug, but Apache 2 looks to be OK:,luna,sleestack,mecca,facedown,openwound,rheeeet&testname=startup&autoscale=1&days=0&units=&ltype=steps&points=1&avg=1

I can't find the source for multiquery.cgi in order to replicate what it does.

My little test perl script emits an image after a sleep of between 0 and 10secs.  I call it from a static html page to display the nine icons/pieX.gif bundled with Apache httpd.  It works as expected on apache 1.3.12, .24 & .42.

I've also set up, but that doesn't cause breakages.
Comment 12 User image Matthias Versen [:Matti] 2012-02-18 22:31:36 PST
Without testcase and comment#11 i vote on marking this wfm
Comment 13 User image Ivan Baldo 2013-05-15 06:44:10 PDT
Maybe this bug should be closed now.

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