9 Replies Latest reply on Jan 13, 2012 9:52 AM by erhard

mod_cluster & AS7 redirect problem

erhard Dec 4, 2011 10:52 AM

Hi,

I tried mod_cluster (1.1.0 and 1.1.3) with JBoss AS7 and a simple demo-application. Apache httpd and AS7 are on the same host (namend devjava), my browser is on a different host. When I call http://devjava/demo7/ everything works fine, however when I call http://devjava/demo7 (without trailing slash) I get:

Firefox can't establish a connection to the server at 127.0.0.1:8080.

The reason is that the browser gets:

HTTP/1.1 302 Moved Temporarily

Date: Sun, 04 Dec 2011 14:52:27 GMT

Server: Apache-Coyote/1.1

Location: http://127.0.0.1:8080/demo7/

...

and since the browser doesn't run on the same host as JBoss, it can't access the page. The redirect URL should be rewritten.

When I try the same with JBoss 4, (with ajp) the browser gets:

HTTP/1.1 302 Moved Temporarily

Date: Sun, 04 Dec 2011 14:51:21 GMT

Location: http://devjava/demo7/

...

The redirect URL is rewritten correctly.

Do I need to add some rewrite rules to make mod_cluster work correctly with http or do you see some other problem (e.g. wrong AS7 config)?

Regards

Erhard

1. Re: mod_cluster & AS7 redirect problem

syncmaster2009 Dec 4, 2011 11:24 AM (in response to erhard)

Not if it will solve it, but did you try to add the ProxyPreserveHost On to your configuration?
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2. Re: mod_cluster & AS7 redirect problem

erhard Dec 4, 2011 2:24 PM (in response to syncmaster2009)

I didn't try it. Also because I wanted to ask whether this should work out of the box or not. With the AJP protocol and JBoss 4 this worked without further configuration. If the cause is in the HTTP-protocol from mod_cluster to AS7, it might be better to configure AJP to AS7 as well to reduce possible problems. So my question is also about best practices.
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3. Re: mod_cluster & AS7 redirect problem

rhusar Dec 4, 2011 6:31 PM (in response to erhard)

Are you trying the mod_cluster demo? Unfortunately it doesnt work on AS7 as it relies on the stuff removed from AS7.

See https://issues.jboss.org/browse/MODCLUSTER-25

HTH,
Rado
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4. Re: mod_cluster & AS7 redirect problem

erhard Dec 5, 2011 4:42 PM (in response to rhusar)

No, just a simple JSP:
./META-INF/MANIFEST.MF
./index.jsp
./WEB-INF/web.xml

with ./WEB-INF/web.xml:

<web-app id="WebApp_ID" version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<display-name>test</display-name>
<distributable/>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
...

But it works, when I configure the ajp-connector like this (added to standalone-ha.xml):
        <subsystem xmlns="urn:jboss:domain:web:1.1" default-virtual-server="default-host">
            <connector name="http" protocol="HTTP/1.1" scheme="http" socket-binding="http"/>
            <connector name="ajp" protocol="AJP/1.3" scheme="http" socket-binding="ajp"/>
           ...
    <socket-binding-group name="standard-sockets" default-interface="public">
        <socket-binding name="http" port="8080"/>
        <socket-binding name="ajp" port="8009"/>
...

and jboss-as-7.1.0.CR1-SNAPSHOT from today.

Greetings
Erhard
1 of 1 people found this helpful
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5. Re: mod_cluster & AS7 redirect problem

erhard Dec 5, 2011 4:53 PM (in response to rhusar)

See https://issues.jboss.org/browse/MODCLUSTER-25
I assume you mean MODCLUSTER-259.
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6. Re: mod_cluster & AS7 redirect problem

rhusar Dec 14, 2011 7:54 PM (in response to erhard)

Haha, correct, I meant that.
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7. Re: mod_cluster & AS7 redirect problem

rhusar Dec 14, 2011 7:54 PM (in response to erhard)

Anyway, does the problem still exist with the latest snapshot?
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8. Re: mod_cluster & AS7 redirect problem

erhard Dec 15, 2011 4:59 PM (in response to rhusar)

I tried 1.1.4-SNAPSHOT from Dec 12.Its the same. I just changed the *.so in httpd. Do I have to change something on AS7 as well?
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9. Re: mod_cluster & AS7 redirect problem

erhard Jan 13, 2012 9:52 AM (in response to syncmaster2009)

When I set ProxyPreserveHost in httpd.conf:
# MOD_CLUSTER_ADDS
# Adjust to you hostname and subnet.
ProxyPreserveHost On

it works:

$ curl -D - http://devjava/demo7

HTTP/1.1 302 Moved Temporarily
Date: Fri, 13 Jan 2012 14:08:06 GMT
Server: Apache-Coyote/1.1
Location: http://devjava/demo7/

Why, is a mystery to me since the Documentation says:
When enabled, this option will pass the Host: line from the incoming request to the proxied host, instead of the hostname specified in the proxypass line. This option should normally be turned Off. It is mostly useful in special configurations like proxied mass name-based virtual hosting, where the original Host header needs to be evaluated by the backend server.
This solution is also indicated in https://community.jboss.org/thread/154665.
It also woks is using:
# MOD_CLUSTER_ADDS
# Adjust to you hostname and subnet.
ProxyPassReverse / balancer://mycluster

$ curl -D - http://devjava/demo7
HTTP/1.1 302 Moved Temporarily
Date: Fri, 13 Jan 2012 14:17:02 GMT
Server: Apache-Coyote/1.1
Location: http://devjava//demo7/

There are two slash // between host and location, but for me it is more consistent with the documentation:
This directive lets Apache adjust the URL in the Location, Content-Location and URI headers on HTTP redirect responses. This is essential when Apache is used as a reverse proxy to avoid by-passing the reverse proxy because of HTTP redirects on the backend servers which stay behind the reverse proxy.

What doesn't work is the configuration that comes with the mod_cluster download. I think at least this should be fixed. See also https://community.jboss.org/message/556683#556683
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