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From Chad Stansbury <>
Subject Re: Tomcat 7 - Sporadic problem re: cookies
Date Wed, 28 Feb 2018 02:02:43 GMT
Hello Chris -

Thanks for your response. Unfortunately it doesn't appear to be a bad
cookie name or value, as the identical set of cookies are passed (and
parsed correctly) on requests that immediately precede and follow the
failing request. That's pretty clear from both the Wireshark and Tomcat
access logs we have. What we're seeing is that the client (which is a
browser, usually Chrome) sends a burst of requests, and occasionally one of
those requests will fail as the web app detects that is has no cookies even
though the Wireshark indicates that there are.  We even added logging to
the AccessLogValve to log the cookies that we're looking for, and it yields
an empty value... So we know that the cookie parsing is either failing or
the cookies get cleared following parsing, but before being passed on to
the AccessLogValve.

Also, as a follow-up, we corrected the HTTP/1.0 issue, and see that the
problem persists even with HTTP/1.1. The one thing that I failed to mention
on the original note is that we're running Tomcat on a Windows server. So
I'm not sure if that has anything to do with the issue that we're seeing or

That being said, I will double-check the catalina.out to see if we can find
any cookie parsing related errors.

Thanks, Chad

On Tue, Feb 27, 2018 at 3:13 PM, Christopher Schultz <> wrote:

> Hash: SHA256
> Chad,
> On 2/27/18 9:44 AM, Chad Stansbury wrote:
> > We've been troubleshooting an issue where our web application is
> > getting a very occasional request that contains no cookies even
> > though a Wireshark on the application server shows those cookies
> > coming in on the request.
> >
> > I was able to replay the request that was captured via Wireshark,
> > and when doing so, everything goes through just fine... so that
> > rules out any sort of weird character set / header parsing issues.
> >
> > Environment specifics: Tomcat v7.0.77 running the (http-bio)
> > connector
> >
> > Now here's the twist: Currently something in the site
> > infrastructure has been configured to proxy to Tomcat with HTTP/1.0
> > instead of 1.1. We're trying to track that down and address that
> > issue (for performance reasons), but in the mean time, we're
> > wondering whether or not this is a concurrency issue related to
> > protocol caching/recycling?
> >
> > Has anyone ever seen anything like this before? Is there any
> > legitimate scenario(s) where Tomcat will *not* parse out the
> > cookies, but still route the request to the web app? Is this
> > possible an edge condition that that might be caused by the use of
> > HTTP/1.0? Could this possibly be caused by the number of maxThreads
> > exceeding the `processorCache` value?
> My immediate thought is that the cookie name or value contains a
> character that causes parsing to fail within Tomcat. Do you have any
> information about which cookies appear to be being ignored by Tomcat
> (that is, not passed-on to the application) versus those that ARE
> available to the application?
> Tomcat will generally log cookie-parsing errors to catalina.log, and
> possibly to the application's log as well, but it may only do so once
> per Tomcat-launch to avoid filling the disk with logs. Are you seeing
> anything in the Tomcat logs which suggest that cookie-parsing is failing
> ?
> Is the client a browser, or some non-human-interface device, such as a
> client-library or something like that?
> - -chris
> Comment: GPGTools -
> Comment: Using GnuPG with Thunderbird -
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> =jwba
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*Chad Stansbury*
Principal Engineer | D3 Banking Technology
11837 Miracle Hills Drive Suite 102 | Omaha, NE | 68154
(o) <>

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