I had a play around with apache locally, and I could reproduce this in some circumstances,
and it looks like we are not setting a high enough backlog by default.
Can you try adding:
undertow.setSocketOption(Options.BACKLOG, 1000)
To your Undertow builder? I am going to increase this in our default config upstream.
Hopefully this is the issue that you are running into.
Stuart
----- Original Message -----
From: "Edgar Espina" <espina.edgar(a)gmail.com>
To: "Stuart Douglas" <sdouglas(a)redhat.com>
Cc: undertow-dev(a)lists.jboss.org
Sent: Monday, 19 January, 2015 12:10:16 PM
Subject: Re: [undertow-dev] occasional 502 from Apache HTTP Proxy
It is a default undertow instance with a HTTP listener, just set work
threads to 200. Is there a default idle timeout? I can' tell from javadoc
and looking at the code.
On Sun, Jan 18, 2015 at 9:59 PM, Stuart Douglas <sdouglas(a)redhat.com> wrote:
>
>
> Edgar Espina wrote:
>
>> I'm not, channel does it.
>>
>> Problem is present on both. For example, home page has a content-length
>> header but jquery.js use chunked.
>>
>
> In general if you are serving static resources you are better off setting
> the content length (slightly more efficient, and the browser can display
> progress on downloads).
>
>
>> Do I have to call .endExchange? or closing the output stream is enough?
>>
>
> Closing the output stream is enough. endExchange is automatically called
> once the call stack returns anyway, unless you have dispatched the exchange
> or started async IO.
>
> The 'connection reset by peer' error in the apache log while reading the
> status like kinda indicates that the request does not even get to this
> point anyway, and the underlying TCP connection is probably being torn down
> somehow.
>
> Do you have any kind of timeouts set? If you have an idle timeout set on
> the listener there is a race where Undertow can close the channel due to
> inactivity just as the front end starts to send a request.
>
> Stuart
>
>
>> Thanks
>>
>> On Sun, Jan 18, 2015 at 9:48 PM, Stuart Douglas <sdouglas(a)redhat.com
>> <mailto:sdouglas@redhat.com>> wrote:
>>
>> Another question, are you setting a content length on the responses?
>> If not the channel will automatically set one if the response fits
>> inside a buffer, otherwise chunked encoding will be used.
>>
>> It might be helpful to know if this only happens on chunked, fixed
>> length or both.
>>
>> Stuart
>>
>> Edgar Espina wrote:
>>
>> latest: 1.2.0.Beta8
>>
>> On Sun, Jan 18, 2015 at 9:42 PM, Stuart Douglas
>> <sdouglas(a)redhat.com <mailto:sdouglas@redhat.com>
>> <mailto:sdouglas@redhat.com
<mailto:sdouglas@redhat.com>>> wrote:
>>
>> Also what version of Undertow are you using?
>>
>> Stuart
>>
>> ----- Original Message -----
>> > From: "Edgar Espina" <espina.edgar(a)gmail.com
>> <mailto:espina.edgar@gmail.com>
>> <mailto:espina.edgar@gmail.com <mailto:espina.edgar@gmail.com
>> >__>>
>> > To: "Stuart Douglas" <sdouglas(a)redhat.com
>> <mailto:sdouglas@redhat.com>
>> <mailto:sdouglas@redhat.com
<mailto:sdouglas@redhat.com>>>
>> > Cc: undertow-dev(a)lists.jboss.org
>> <mailto:undertow-dev@lists.jboss.org>
>> <mailto:undertow-dev@lists.__jboss.org
>> <mailto:undertow-dev@lists.jboss.org>>
>> > Sent: Monday, 19 January, 2015 11:13:21 AM
>> > Subject: Re: [undertow-dev] occasional 502 from Apache HTTP
>> Proxy
>> >
>> > found this in apache:
>> >
>> > (104) Connection reset by peer: proxy: error reading status
>> line from
>> > remote server
>> >
>> > but nothing in undertow.
>> >
>> > got 502 on HTTP GET. Sometimes while calling the home page / or
>> when page
>> > loads OK, got 502 on page resources (js, css, images).
>> >
>> > I call startBlocking and use the outputstream to write the
>> response, when
>> > everything has been written I call the
"outputstream.close"
>> method. Do I
>> > need to call exchange.endExchange too?
>> >
>> > Thanks
>> >
>> > On Sun, Jan 18, 2015 at 8:52 PM, Stuart Douglas
>> <sdouglas(a)redhat.com <mailto:sdouglas@redhat.com>
>> <mailto:sdouglas@redhat.com
<mailto:sdouglas@redhat.com>>> wrote:
>> >
>> > > Is there any info in the log? Or is there any specific type
>> of
>> request
>> > > that causes this?
>> > >
>> > > Stuart
>> > >
>> > >
>> > > ----- Original Message -----
>> > > > From: "Edgar Espina"
<espina.edgar(a)gmail.com
>> <mailto:espina.edgar@gmail.com>
>> <mailto:espina.edgar@gmail.com <mailto:espina.edgar@gmail.com
>> >__>>
>> > > > To: undertow-dev(a)lists.jboss.org
>> <mailto:undertow-dev@lists.jboss.org>
>> <mailto:undertow-dev@lists.__jboss.org
>> <mailto:undertow-dev@lists.jboss.org>>
>> > > > Sent: Monday, 19 January, 2015 9:42:19 AM
>> > > > Subject: [undertow-dev] occasional 502 from Apache HTTP
>> Proxy
>> > > >
>> > > > Hi,
>> > > >
>> > > > I've an Undertow application behind apache reverse
proxy,
>> trying to load
>> > > a
>> > > > page displays error 502 proxy error.
>> > > >
>> > > > Still couldn't find why so I wonder if any of you
find a
>> similar problem
>> > > with
>> > > > Undertow and Apache.
>> > > >
>> > > > Please note this is our first app on top of Undertow,
>> existing apps
>> > > running
>> > > > on Tomcat/Jetty are OK.
>> > > >
>> > > > Appreciate any help.
>> > > >
>> > > > Thanks
>> > > >
>> > > > --
>> > > > edgar
>> > > >
>> > > > _________________________________________________
>> > > > undertow-dev mailing list
>> > > > undertow-dev(a)lists.jboss.org
>> <mailto:undertow-dev@lists.jboss.org>
>> <mailto:undertow-dev@lists.__jboss.org
>> <mailto:undertow-dev@lists.jboss.org>>
>> > > >
https://lists.jboss.org/__mailman/listinfo/undertow-dev
>> <
https://lists.jboss.org/mailman/listinfo/undertow-dev>
>> > >
>> >
>> >
>> >
>> > --
>> > edgar
>> >
>>
>>
>>
>>
>> --
>> edgar
>>
>>
>>
>>
>> --
>> edgar
>>
>
--
edgar