[undertow-dev] occasional 502 from Apache HTTP Proxy
Stuart Douglas
sdouglas at redhat.com
Sun Jan 18 21:13:41 EST 2015
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 at gmail.com>
> To: "Stuart Douglas" <sdouglas at redhat.com>
> Cc: undertow-dev at 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 at 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 at redhat.com
> >> <mailto:sdouglas at 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 at redhat.com <mailto:sdouglas at redhat.com>
> >> <mailto:sdouglas at redhat.com <mailto:sdouglas at redhat.com>>> wrote:
> >>
> >> Also what version of Undertow are you using?
> >>
> >> Stuart
> >>
> >> ----- Original Message -----
> >> > From: "Edgar Espina" <espina.edgar at gmail.com
> >> <mailto:espina.edgar at gmail.com>
> >> <mailto:espina.edgar at gmail.com <mailto:espina.edgar at gmail.com
> >> >__>>
> >> > To: "Stuart Douglas" <sdouglas at redhat.com
> >> <mailto:sdouglas at redhat.com>
> >> <mailto:sdouglas at redhat.com <mailto:sdouglas at redhat.com>>>
> >> > Cc: undertow-dev at lists.jboss.org
> >> <mailto:undertow-dev at lists.jboss.org>
> >> <mailto:undertow-dev at lists.__jboss.org
> >> <mailto:undertow-dev at 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 at redhat.com <mailto:sdouglas at redhat.com>
> >> <mailto:sdouglas at redhat.com <mailto:sdouglas at 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 at gmail.com
> >> <mailto:espina.edgar at gmail.com>
> >> <mailto:espina.edgar at gmail.com <mailto:espina.edgar at gmail.com
> >> >__>>
> >> > > > To: undertow-dev at lists.jboss.org
> >> <mailto:undertow-dev at lists.jboss.org>
> >> <mailto:undertow-dev at lists.__jboss.org
> >> <mailto:undertow-dev at 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 at lists.jboss.org
> >> <mailto:undertow-dev at lists.jboss.org>
> >> <mailto:undertow-dev at lists.__jboss.org
> >> <mailto:undertow-dev at lists.jboss.org>>
> >> > > > https://lists.jboss.org/__mailman/listinfo/undertow-dev
> >> <https://lists.jboss.org/mailman/listinfo/undertow-dev>
> >> > >
> >> >
> >> >
> >> >
> >> > --
> >> > edgar
> >> >
> >>
> >>
> >>
> >>
> >> --
> >> edgar
> >>
> >>
> >>
> >>
> >> --
> >> edgar
> >>
> >
>
>
> --
> edgar
>
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