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Posted to users@tomcat.apache.org by Brian McEntire <br...@fsg1.nws.noaa.gov> on 2005/01/08 06:06:56 UTC
Apache returning different sizes for same request [was Re: Controlling
caching / session collision]
This is a follow-up to my question. I hope someone might have seen this
before. I don't know if this is a Tomcat, or mod_jk, or Apache issue, but
since I've only seen it with JSPs, I think Tomcat or mod_jk factor in.
Here are entries from Apache's combined access log when the problem
occurs:
192.168.1.1 - - [07/Jan/2005:18:01:36 -0500] "GET
/jsp/dipper/listByOwner.jsp HTTP/1.1" 200 5601 "-" "Java/1.4.2_06"
192.168.1.1 - - [07/Jan/2005:18:01:36 -0500] "GET
/jsp/dipper/decodedDataChartContents.jsp HTTP/1.1" 200 8503 "-"
"Java/1.4.2_06"
192.168.1.1 - - [07/Jan/2005:18:02:09 -0500] "GET
/jsp/dipper/listByOwner.jsp HTTP/1.1" 200 8503
"http://server-obscurred.gov/dipper/contents.html" "Mozilla/5.0 (X11;
U; Linux i686; en-US; rv:1.7.3) Gecko/20041007 Debian/1.7.3-5"
Those entries are slightly sanitized. The point is, in the first entry,
the size of the response sent by Apache back to the client for
listByOwner.jsp is correct at 5601. The correct size is sent back for
decodedDataChartContents.jsp in the second entry at 8503.
The problem presented with the third request: Apache sent back the wrong
response. My browser requested listByOwner.jsp but received
decodedDataChartContents.jsp. I expected listByOwner but saw
decodedDataChartContents. Apache's log shows that the response it served
was the same size as decodedDataChartContents.jsp even though the request
was for listByOwner.jsp.
Has anyone seen this before? Any ideas what would cause that or how to
prevent it?
Thanks!
Brian
On Fri, 7 Jan 2005, Brian McEntire wrote:
> I am running Tomcat 5.0.28, mod_jk 1.2.8, and Apache/2.0.46 on Redhat
> Enterprise Linux WS 3.0.
>
> We have an HTML page that is a frame: top (banner), left hand (menu), and
> right hand (main content). There are 6 hyperlinks in the LH pane that point
> to *.jsp pages that load in the RH pane via a
> <BASE TARGET="displayContents"> tag. Usually, these links work. But
> occasionally when clicking one link, content that belongs to another link
> appears in the main/RH pane. This problem seems to get worse the longer
> Tomcat is up.
>
> The JSPs that we are using don't make use of sessions as far as I can tell.
> Logins are not required. The JSPs are only used to generate dynamic content
> and forms for submission.
>
> I have tried setting the following in workers.properties:
> worker.workerHADS.socket_keepalive=FALSE
> worker.workerHADS.cache_timeout=60
> worker.workerHADS.cachesize=1
> worker.workerHADS.reclycle_timeout=30
>
> I added this within the <head></head> section of each JSP:
> <META HTTP-EQUIV="Pragma" CONTENT="no-cache">
> <META HTTP-EQUIV="Expires" CONTENT="-1">
>
> But the problem still presents occasionally. It happens on Mozilla and IE
> browsers, and probably others. It looks like a server side issue. It is not
> 100% reproducible. It cannot be reproduced immediately after Tomcat is
> started. But after several hours (or possibly some number of visitors to the
> page) it starts to happen and gets more frequent over time.
>
> Any suggestions would be greatly appreciated!
> Thanks, Brian
>
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