Re: [undertow-dev] occasional 502 from Apache HTTP Proxy

From: "Edgar Espina" <espina.edgar(a)gmail.com&gt; To: "Stuart Douglas" <sdouglas(a)redhat.com&gt; 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&gt; 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