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From: Jeffrey Janner <Jeffrey.Janner@PolyDyne.com>
To: 'Tomcat Users List' <users@tomcat.apache.org>, 'Tomcat Users List'
	<users@tomcat.apache.org>
Subject: RE: httpd/Tomcat load balancing question
Thread-Topic: httpd/Tomcat load balancing question
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 AcuiDSY909uOc0vIRf+LdbE1il2EkgAPgauAAAi4xEAAEOmOoAAheC6Q//88IICAADwRUA==
Date: Thu, 23 Dec 2010 15:49:36 +0000
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I think I'm going to have to eventually go the mod-rewrite route.  The team=
 doesn't want to remove the c:url tag on all the pages, just the login page=
=2E If they don't remove them from all, then someone who is really running =
in cookie-off mode will have problems on all the rest of the pages.=0D=0A=0D=
=0AHowever, here's the one bit I don't quite understand how it's working.  =
The servlet definitions are:=0D=0A    <servlet-mapping>=0D=0A        <servl=
et-name>default</servlet-name>=0D=0A        <url-pattern>/static/*</url-pat=
tern>=0D=0A    </servlet-mapping>=0D=0A=0D=0A    <servlet>=0D=0A        <se=
rvlet-name>Portal</servlet-name>=0D=0A        <servlet-class>org.springfram=
ework.web.servlet.DispatcherServlet</servlet-class>=0D=0A        <load-on-s=
tartup>2</load-on-startup>=0D=0A    </servlet>=0D=0A    <servlet-mapping>=0D=
=0A        <servlet-name>Portal</servlet-name>=0D=0A        <url-pattern>/<=
/url-pattern>=0D=0A    </servlet-mapping>=0D=0AThis is supposed to send any=
thing that comes in as /static/ to the default servlet for Tomcat to serve =
directly, bypassing the Spring dispatcher and all that security nonsense. B=
ut the directory structure is:=0D=0A   Webapps=0D=0A     -- Portal=0D=0A   =
       --images=0D=0A          --scripts=0D=0A          --WEB-INF=0D=0AHow =
does the default servlet know to serve /Portal/static/images/logo.jpg (afte=
r c:url encoding) from the images directory above (assuming this was runnin=
g in a standalone Tomcat -- which is the individual programmers test enviro=
nment).=0D=0AOr is it not doing what the dev team thinks it's doing=3F=0D=0A=0D=
=0AJeff=0D=0A=0D=0A> -----Original Message-----=0D=0A> From: Andr=E9 Warnie=
r [mailto:aw@ice-sa.com]=0D=0A> Sent: Thursday, December 23, 2010 7:15 AM=0D=
=0A> To: Tomcat Users List=0D=0A> Subject: Re: httpd/Tomcat load balancing =
question=0D=0A>=20=0D=0A> I'll top post and reply to an earlier message at =
the same time,=0D=0A> although I'm sure that=0D=0A> this is frowned upon in=
 both cases.=0D=0A>=20=0D=0A> Considering the sum of the answers so far :=0D=
=0A>=20=0D=0A> 1) According to Pid*, yes, the "<c:url .." encapsulation is =
the reason=0D=0A> for the added=0D=0A> ";jession-id" suffix, which interfer=
es when Apache httpd is asked to=0D=0A> deliver the target of=0D=0A> these =
links to static elements.=0D=0A>=20=0D=0A> 2) it would seem to me that the =
best (most efficient) way, in your=0D=0A> context, would be to=0D=0A> remov=
e that encapsulation for all links directed to static elements.=0D=0A> That=
 would not only=0D=0A> fix the problem you are having, but also avoid some =
unnecessary=0D=0A> processing on the Tomcat=0D=0A> side (and on the httpd s=
ide, see #4 below).=0D=0A>=20=0D=0A> 3) one point made by Konstantin is tha=
t of course in this case, these=0D=0A> static elements=0D=0A> themselves wi=
ll not be subject to the Tomcat authentication and access-=0D=0A> control r=
ules.=0D=0A> But that is already implicit, since they are delivered by Apac=
he httpd=0D=0A> anyway.=0D=0A>=20=0D=0A> 4) in the worst case - aka your De=
v team cannot easily remove the=0D=0A> encapsulation - there=0D=0A> are way=
s to remove the ";jessionid" suffix at the Apache httpd level,=0D=0A> using=
 mod=5Frewrite=0D=0A> for instance.  But that definitely sounds like doing =
the work twice :=0D=0A> once for Tomcat to=0D=0A> add the suffixes, then ag=
ain for httpd to remove them.=0D=0A>=20=0D=0A> 5) There is also a way to re=
move the jessionid suffix, using mod=5Fjk as=0D=0A> the connector=0D=0A> be=
tween httpd and tomcat instead of mod=5Fproxy, as per Rainer's=0D=0A> sugge=
stion (JkStripSession=0D=0A> configuration directive).  mod=5Fjk is (at lea=
st) as good as mod=5Fproxy in=0D=0A> terms of=0D=0A> connecting and load-ba=
lancing, but it is a different configuration.=0D=0A>=20=0D=0A> 6) and if th=
ese java guys don't get it cooked, there are other ways to=0D=0A> do this, =
but this=0D=0A> would become off-topic for this list, so maybe we should th=
en do that=0D=0A> offline.=0D=0A>=20=0D=0A> 7) your proposed course of acti=
on below is self-defeating, since if you=0D=0A> manage to convince=0D=0A> t=
hem it will mean that they are not what you think they are.=0D=0A>=20=0D=0A=
> Jeffrey Janner wrote:=0D=0A> > Definitely the culprit.  Now, I just have =
to convince the Dev team=0D=0A> that they are, once again, a bunch of idiot=
s.=0D=0A> >=0D=0A> > I'm sure it's some framework/tool they are using.  The=
 question now=0D=0A> is, if I can't get them to not use it in this case, is=
 there some way=0D=0A> to modify httpd to strip the ;jsessionid stuff, or p=
ass it on to the=0D=0A> Tomcat server if it's there=3F  That is, ignore the=
 local feed if there=0D=0A> is a sticky session id embedded in the URL=3F=0D=
=0A> >=0D=0A> > Jeff=0D=0A> >=0D=0A> >> -----Original Message-----=0D=0A> >=
> From: Jeffrey Janner [mailto:Jeffrey.Janner@PolyDyne.com]=0D=0A> >> Sent:=
 Wednesday, December 22, 2010 4:50 PM=0D=0A> >> To: 'Tomcat Users List'=0D=0A=
> >> Subject: RE: httpd/Tomcat load balancing question=0D=0A> >>=0D=0A> >> =
In the specific case I mention below, this is the source from the=0D=0A> js=
p:=0D=0A> >>         <link rel=3D"icon" type=3D"image/x-icon" href=3D"<c:ur=
l=0D=0A> >> value=3D"/static/images/icons/favicon.ico"/>" />=0D=0A> >>=0D=0A=
> >> I'm not a jsp programmer, but I'm betting it has something to do=0D=0A=
> with=0D=0A> >> the <c:url /> encapsulation.=0D=0A> >> Jeff=0D=0A> >>=0D=0A=
> >>> -----Original Message-----=0D=0A> >>> From: Jeffrey Janner [mailto:Je=
ffrey.Janner@PolyDyne.com]=0D=0A> >>> Sent: Wednesday, December 22, 2010 4:=
40 PM=0D=0A> >>> To: 'Tomcat Users List'; 'Tomcat Users List'=0D=0A> >>> Su=
bject: RE: httpd/Tomcat load balancing question=0D=0A> >>>=0D=0A> >>> Thank=
s, that was what I was thinking.=0D=0A> >>> Since the only JSP I have acces=
s to is the welcome-file, I'm not=0D=0A> sure=0D=0A> >> I=0D=0A> >>> can ve=
rify.=0D=0A> >>>=0D=0A> >>> Q: I would think the getContextPath would be de=
sirable, in case we=0D=0A> >>> change the war-file name, etc., but I wouldn=
't think that would=0D=0A> cause=0D=0A> >>> the jsessionID string to get ap=
pended to the end of the path.  That=0D=0A> >> is,=0D=0A> >>> they are comi=
ng out as=0D=0A> >>>=0D=0A> >>=0D=0A> "/Portal/static/images/icons/favicon.=
ico;jsessionid=3DB4E3E4AA3D79B8877A0=0D=0A> >>> 9CFCC32827D09.tomcat1".=0D=0A=
> >>>=0D=0A> >>> Jeff=0D=0A> >>>=0D=0A> >>>> -----Original Message-----=0D=0A=
> >>>> From: Andr=E9 Warnier [mailto:aw@ice-sa.com]=0D=0A> >>>> Sent: Wedne=
sday, December 22, 2010 2:43 PM=0D=0A> >>>> To: Tomcat Users List=0D=0A> >>=
>> Subject: Re: httpd/Tomcat load balancing question=0D=0A> >>>>=0D=0A> >>>=
> Hi.=0D=0A> >>>>=0D=0A> >>>> Not knowing anything about JSP per se, I woul=
d nevertheless guess=0D=0A> >>> that=0D=0A> >>>> the links are=0D=0A> >>>> =
written using something like=0D=0A> >>>> <img src=3D"<%getContextPath%>/sta=
tic/mylogo.jpg"/> or similarly,=0D=0A> >>> instead=0D=0A> >>>> of just plai=
n html=0D=0A> >>>> <img src=3D"/Portal/static/mylogo.jpg"/>.=0D=0A> >>>> Th=
at probably leads the JSP compiler to think it has to=0D=0A> >> "relativise=
"=0D=0A> >>>> the links to the app=0D=0A> >>>> context and so on, while in =
this case it should not, because they=0D=0A> >>> will=0D=0A> >>>> be served=
 by the=0D=0A> >>>> front-end, not by Tomcat.=0D=0A> >>>>=0D=0A> >>>>=0D=0A=
> >>>>=0D=0A> >>>> Jeffrey Janner wrote:=0D=0A> >>>>> Httpd 2.2.17=0D=0A> >=
>>>> Tomcat 6.0.29=0D=0A> >>>>> Sun JDK 1.6.0=5F22=0D=0A> >>>>> Spring Fram=
ework (3.0.2 I think)=0D=0A> >>>>> All on Windows=0D=0A> >>>>>=0D=0A> >>>>>=
 The Dev team is creating a new app that we are planning to deploy=0D=0A> >=
>>> using httpd as a load-balancer to two Tomcats on separate servers.=0D=0A=
> >>>> Httpd is configured to serve static files - graphics, css, etc. -=0D=
=0A> >>> with=0D=0A> >>>> everything else being sent to the Tomcat servers =
over AJP.  The=0D=0A> >>> Tomcat=0D=0A> >>>> app has one jsp file setup as =
the welcome-file, which just does a=0D=0A> >>>> redirect to host/app/login,=
 which is an internal action that=0D=0A> >>> generates=0D=0A> >>>> the real=
 login screen.  All other parts of the app are buried in=0D=0A> >> the=0D=0A=
> >>>> WEB-INF/classes structure (as far as I can tell).=0D=0A> >>>>> We ar=
e currently testing the setup, and if you go to=0D=0A> >>>> http://prtltest=
=2Epolydyne.com, everything seems to work just fine.=0D=0A> >>> The=0D=0A> =
>>>> browser gets redirected to=0D=0A> >> http://prtltest.polydyne.com/Port=
al/login=0D=0A> >>>> and the screen looks fine.  The problem is if you go d=
irectly to=0D=0A> >> the=0D=0A> >>>> login page, bypassing the welcome-file=
 redirect, then you don't=0D=0A> get=0D=0A> >>> the=0D=0A> >>>> static file=
s.  If you refresh the page, everything shows up again.=0D=0A> >>>>> Lookin=
g at the source of the login page, it appears that all the=0D=0A> >>>> stat=
ic links have the jsessionid appended to them on the first=0D=0A> >> load,=0D=
=0A> >>>> but not on subsequent loads.  I assume this is because Tomcat=0D=0A=
> >> hasn't=0D=0A> >>>> determined cookie support yet when it generates the=
 page the first=0D=0A> >>>> time, but does know about it on the refresh.  M=
y question is, is=0D=0A> >>> there=0D=0A> >>>> something the Dev team shoul=
d be doing before generating the login=0D=0A> >>>> page, or generating the =
static links, or is there a configuration=0D=0A> >>>> setting I'm missing i=
n the httpd.conf file=3F  Or perhaps in the=0D=0A> >>> web.xml=3F=0D=0A> >>=
>>> Jeff=0D=0A> >>>>>=0D=0A> >>>>> The httpd.conf file is pretty stock, wit=
h the following added for=0D=0A> >>> the=0D=0A> >>>> load-balancer configur=
ation:=0D=0A> >>>>> <Location /balancer-manager>=0D=0A> >>>>>   SetHandler =
balancer-manager=0D=0A> >>>>>=0D=0A> >>>>>   Order Deny,Allow=0D=0A> >>>>> =
  Deny from all=0D=0A> >>>>>   Allow from 10.1.1 127.0.0.1=0D=0A> >>>>> </L=
ocation>=0D=0A> >>>>>=0D=0A> >>>>> <Proxy balancer://mycluster>=0D=0A> >>>>=
>                 BalancerMember ajp://prtltest01:8009/Portal=0D=0A> >>>> r=
oute=3Dtomcat1 loadfactor=3D50=0D=0A> >>>>>                 BalancerMember =
ajp://prtltest02:8009/Portal=0D=0A> >>>> route=3Dtomcat2 loadfactor=3D50=0D=
=0A> >>>>> </Proxy>=0D=0A> >>>>>=0D=0A> >>>>> ProxyPass /Portal/static !=0D=
=0A> >>>>> ProxyPass /Portal balancer://mycluster=0D=0A> >>>> stickysession=
=3DJSESSIONID|jsessionid scolonpathdelim=3DOn=0D=0A> >>>>> ProxyPass / bala=
ncer://mycluster/=0D=0A> >>> stickysession=3DJSESSIONID|jsessionid=0D=0A> >=
>>> scolonpathdelim=3DOn=0D=0A> >>>>> The web.xml file is:=0D=0A> >>>>>=0D=0A=
> >>>>> <=3Fxml version=3D"1.0" encoding=3D"UTF-8"=3F>=0D=0A> >>>>> <web-ap=
p version=3D"2.5" xmlns=3D"http://java.sun.com/xml/ns/javaee"=0D=0A> >>>> x=
mlns:xsi=3D"http://www.w3.org/2001/XMLSchema-instance"=0D=0A> >>>> xsi:sche=
maLocation=3D"http://java.sun.com/xml/ns/javaee=0D=0A> >>>> http://java.sun=
=2Ecom/xml/ns/javaee/web-app=5F2=5F5.xsd">=0D=0A> >>>>>     <display-name>P=
olydyne Portal Application</display-name>=0D=0A> >>>>>     <!-- Log4J Confi=
g -->=0D=0A> >>>>>     <context-param>=0D=0A> >>>>>         <param-name>log=
4jConfigLocation</param-name>=0D=0A> >>>>>         <param-value>/WEB-INF/lo=
g4j.properties</param-value>=0D=0A> >>>>>     </context-param>=0D=0A> >>>>>=
     <listener>=0D=0A> >>>>>         <listener-=0D=0A> >>>> class>org.sprin=
gframework.web.util.Log4jConfigListener</listener-=0D=0A> >>> class>=0D=0A>=
 >>>>>     </listener>=0D=0A> >>>>>     <context-param>=0D=0A> >>>>>       =
  <param-name>contextConfigLocation</param-name>=0D=0A> >>>>>         <para=
m-value>=0D=0A> >>>>>             /WEB-INF/Portal-service.xml=0D=0A> >>>>> =
            /WEB-INF/Portal-security.xml=0D=0A> >>>>>         </param-value=
>=0D=0A> >>>>>     </context-param>=0D=0A> >>>>>     <listener>=0D=0A> >>>>=
>         <listener-=0D=0A> >>=0D=0A> class>org.springframework.web.context=
=2EContextLoaderListener</listener-=0D=0A> >>>> class>=0D=0A> >>>>>     </l=
istener>=0D=0A> >>>>>=0D=0A> >>>>>     <!-- Concurrent Session Control -->=0D=
=0A> >>>>>     <listener>=0D=0A> >>>>>         <listener-=0D=0A> >>=0D=0A> =
class>org.springframework.security.web.session.HttpSessionEventPublishe=0D=0A=
> >>>> r</listener-class>=0D=0A> >>>>>     </listener>=0D=0A> >>>>>=0D=0A> =
>>>>>     <!-- Reads request input using UTF-8 encoding -->=0D=0A> >>>>>   =
  <filter>=0D=0A> >>>>>         <filter-name>characterEncodingFilter</filte=
r-name>=0D=0A> >>>>>         <filter-=0D=0A> >>=0D=0A> class>org.springfram=
ework.web.filter.CharacterEncodingFilter</filter-=0D=0A> >>>> class>=0D=0A>=
 >>>>>         <init-param>=0D=0A> >>>>>             <param-name>encoding</=
param-name>=0D=0A> >>>>>             <param-value>UTF-8</param-value>=0D=0A=
> >>>>>         </init-param>=0D=0A> >>>>>         <init-param>=0D=0A> >>>>=
>             <param-name>forceEncoding</param-name>=0D=0A> >>>>>          =
   <param-value>true</param-value>=0D=0A> >>>>>         </init-param>=0D=0A=
> >>>>>     </filter>=0D=0A> >>>>>     <filter-mapping>=0D=0A> >>>>>       =
  <filter-name>characterEncodingFilter</filter-name>=0D=0A> >>>>>         <=
url-pattern>/*</url-pattern>=0D=0A> >>>>>     </filter-mapping>=0D=0A> >>>>=
>=0D=0A> >>>>>     <!-- Spring Security settings start -->=0D=0A> >>>>>    =
 <filter>=0D=0A> >>>>>         <filter-name>springSecurityFilterChain</filt=
er-name>=0D=0A> >>>>>         <filter-=0D=0A> >>>>=0D=0A> class>org.springf=
ramework.web.filter.DelegatingFilterProxy</filter-=0D=0A> >>>> class>=0D=0A=
> >>>>>     </filter>=0D=0A> >>>>>     <filter-mapping>=0D=0A> >>>>>       =
  <filter-name>springSecurityFilterChain</filter-name>=0D=0A> >>>>>        =
 <url-pattern>/*</url-pattern>=0D=0A> >>>>>     </filter-mapping>=0D=0A> >>=
>>>     <!-- Spring Security settings end -->=0D=0A> >>>>>     <!-- Servlet=
 Definition -->=0D=0A> >>>>>     <!--=0D=0A> >>>>>      - Map static resour=
ces to the default servlet=0D=0A> >>>>>      - examples:=0D=0A> >>>>>      =
-     http://localhost:8080/static/images/pets.png=0D=0A> >>>>>      -     =
http://localhost:8080/static/styles/petclinic.css=0D=0A> >>>>>     -->=0D=0A=
> >>>>>     <servlet-mapping>=0D=0A> >>>>>         <servlet-name>default</s=
ervlet-name>=0D=0A> >>>>>         <url-pattern>/static/*</url-pattern>=0D=0A=
> >>>>>     </servlet-mapping>=0D=0A> >>>>>=0D=0A> >>>>>     <servlet>=0D=0A=
> >>>>>         <servlet-name>Portal</servlet-name>=0D=0A> >>>>>         <s=
ervlet-=0D=0A> >>>> class>org.springframework.web.servlet.DispatcherServlet=
</servlet-=0D=0A> >>> class>=0D=0A> >>>>>         <load-on-startup>2</load-=
on-startup>=0D=0A> >>>>>     </servlet>=0D=0A> >>>>>     <servlet-mapping>=0D=
=0A> >>>>>         <servlet-name>Portal</servlet-name>=0D=0A> >>>>>        =
 <url-pattern>/</url-pattern>=0D=0A> >>>>>     </servlet-mapping>=0D=0A> >>=
>>>     <!-- Servlet Definition End -->=0D=0A> >>>>>     <session-config>=0D=
=0A> >>>>>         <session-timeout>=0D=0A> >>>>>             30=0D=0A> >>>=
>>         </session-timeout>=0D=0A> >>>>>     </session-config>=0D=0A> >>>=
>>     <welcome-file-list>=0D=0A> >>>>>         <welcome-file>redirect.jsp<=
/welcome-file>=0D=0A> >>>>>     </welcome-file-list>=0D=0A> >>>>>     <erro=
r-page>=0D=0A> >>>>>         <exception-=0D=0A> >>>> type>javax.servlet.Una=
vailableException</exception-type>=0D=0A> >>>>>         <location>/WEB-=0D=0A=
> >> INF/views/errors/Unavailable.html</location>=0D=0A> >>>>>     </error-=
page>=0D=0A> >>>>>     <error-page>=0D=0A> >>>>>         <exception-type>50=
3</exception-type>=0D=0A> >>>>>         <location>/WEB-=0D=0A> >> INF/views=
/errors/Unavailable.html</location>=0D=0A> >>>>>     </error-page>=0D=0A> >=
>>>> </web-app>=0D=0A> >>>>>=0D=0A> >>=0D=0A> =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=0D=0A> >>>> =5F=5F=5F=0D=0A> >>>>> Confid=
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