The good news is that you will learn more by encountering problems and
solving them, than if everything worked correctly on the first pass.
Ravi Sharma wrote:
[...]
Alias /ex /usr/java/tomcat-5.5/webapps/servlets-examples
JkMount /ex/servlet/* testWorker
I think that the two lines above conflict with eachother :
First you are telling Apache that if it sees "/ex" in a URI, it should
translate it to "/usr/java/tomcat-5.5/webapps/servlets-examples".
Then you are telling Apache that if it sees a URI like "/ex/servlet/*",
it should pass it to mod_jk (which will pass it to Tomcat).
Here is my guess as to what happens, step by step :
You send the following request to Apache :
/ex/servlet/HelloWorldExample
Because of the "Alias", Apache will first translate this to the file
location
/usr/java/tomcat-5.5/webapps/servlets-examples/HelloWorldExample
Then Apache will try to find a "handler" for that location.
Because mod_jk is installed, Apache will ask mod_jk if it is interested
in this URI.
mod_jk will say no, because the above translated URI does not match
"/ex/servlet/*" in the JkMount. So mod_jk will return "DECLINED" to Apache.
Then Apache will ask other possible handlers, and if nobody else wants
this URI, then Apache will select its own default handler (the one which
just returns local files).
This default handler will try to find the file
/usr/java/tomcat-5.5/webapps/servlets-examples/HelloWorldExample
and will not find it. So it will return an error.
The point is that an "Alias" happens earlier in the cycle of processing
the request (the "URI translation" step), and the "content generation"
step happens later. mod_jk (and Tomcat) are involved in the
"content-generation" phase. But by the time mod_jk is getting asked if
it wants to generate the content, the URI is already tanslated, and
mod_jk does not recognise it.
In short, for a test of the above, comment out the "Alias" line, restart
Apache, and try again the URL
http://www.jaatmusic.com/ex/servlet/HelloWorldExample
Of course, with the above change, your first URL
http://www.jaatmusic.com/ex
will probably not work anymore, but that is normal and we will see that
next.
For a bit more more information on the order in which the various
request processing steps happen in Apache, read through this :
http://httpd.apache.org/docs/2.2/developer/request.html
For the same with pictures, try this :
http://www.apachetutor.org/dev/request
André
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