Mark,
I'm working on a test case. I've built a simple spring boot war with a rest
API "jsonInput" that accepts any JSON and responds with {"message":"OK"}.
What I've determined so far is that it only happens when you are proxying
the request through Apache using mod_proxy_http2, and the size of the JSON
that you are sending has something to do with the problem. I can send a
large JSON or a small one directly to Tomcat, which works. If I send a
small JSON through mod_proxy_http2, it also works, but if I send the JSON
that our client apps are sending, which is quite large, it fails.
Before I spend more time on this test case, can you think of any setting in
Tomcat or mod_proxy_http2 that might cause the POST of the larger JSON to
fail?
--
Thanks,
Dan
On Wed, Jul 12, 2023 at 2:36 PM Mark Thomas <ma...@apache.org> wrote:
>
> 12 Jul 2023 13:40:18 Dan McLaughlin <d...@danshome.net.INVALID>:
>
> > I can confirm that if I switch h2 to http, everything works as
> > expected, change it back to h2 or h2c, and it breaks.
>
> That makes me think it is an h2 bug in Tomcat.
>
> > Mark, Please let me know if the http2 logs weren't enough to tell you
> > what's happening; if not, I'll work on creating a simple standalone
> > reproduction using docker.
>
> I've looked through those logs and don't see anything. Enabling debug
> logs for org.apache.tomcat.util.net might help but a reproducible test
> case is probably the easiest for us to work with.
>
> If you can avoid using docker that helps as it is one less thing for us
> to unpick when digging for the root cause but we can work with a docker
> based reproducible test case if needed.
>
> Mark
>
> >
> > --
> >
> > Thanks,
> >
> > Dan
> >
> > On Wed, Jul 12, 2023 at 6:00 AM Dan McLaughlin <d...@danshome.net>
> > wrote:
> >>
> >> Hi Mark,
> >>
> >> I already provided the output from org.apache.coyote.http2.level =
> >> FINE in the very first post to this thread. I didn't include
> >> everything because all the header information includes things I don't
> >> necessarily want to post publicly and because it would take a while
> >> for me to obfuscate. I will see if it's reproducible with a curl
> >> command and if I can reproduce it in a standalone docker image.
> >>
> >> I will also try with mod_proxy_http, as suggested by Chris.
> >>
> >> Let me know if there is more logging I truncated that you need to see
> >> that might tell you where the problem is; if I can provide it, I will.
> >>
> >> --
> >>
> >> Thanks,
> >>
> >> Dan
> >>
> >>
> >>
> >> On Wed, Jul 12, 2023 at 3:34 AM Mark Thomas <ma...@apache.org> wrote:
> >>>
> >>> On 11/07/2023 19:10, Dan McLaughlin wrote:
> >>>> One other note, is I can switch to h2c, and it still fails, and a
> >>>> packet
> >>>> capture shows the entire JSON is delivered to Tomcat, and when I put
> >>>> the
> >>>> JSON from the packet inspection together (Packets 10199 --> 10208)
> >>>> and
> >>>> compare it to what the browser says was sent, they are identical.
> >>>> There are
> >>>> no signs of TCP retransmissions or other things you might expect to
> >>>> see if
> >>>> there was a networking related issue.
> >>>
> >>> Hi Dan,
> >>>
> >>> This looks like a possible Tomcat bug to me.
> >>>
> >>> To debug futher I'd suggest the following:
> >>>
> >>> Enable http2 debug logging by adding the following to
> >>> $CATALINA_BASE/conf/logging.properties
> >>>
> >>> org.apache.coyote.http2.level = FINE
> >>>
> >>> (that line should already be there, it just needs to be uncommented).
> >>>
> >>> If you can provide a curl command or similar that triggers this issue
> >>> then please feel free to open a Bugzilla issue and attached the
> >>> script
> >>> and any relevant configuration snippets for httpd etc and we can try
> >>> and
> >>> reproduce it.
> >>>
> >>> Thanks,
> >>>
> >>> Mark
> >>>
> >>> ---------------------------------------------------------------------
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> >>>
> >
> > --
> >
> >
> >
> >
> >
> >
> >
> >
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