I find Apache useful for the following things:
- Content-Expiration, Cache-Control, and max-age (mod_expires and mod_headers)
- Compression (mod_deflate)

A decent article that goes into more detail:
http://www.mnot.net/cache_docs/

Those two things can have a drastic impact on the performance of the midtier.

There are also those applications that have more holes that swiss
cheese.  Using Apache in front of Tomcat let's you manipulate/validate
the querystring in a way to mitigate issues inherent in the
application.

The other place I find it useful is with SSO related tasks, especially
with legacy SSO solutions.  That agent has to run somewhere.

mod_jk has issues on Solaris, but they can be worked around through
the configuration.  There is also mod_proxy_ajp, which is now part of
mod_proxy that can be used in lieu of mod_jk.  I have not used
mod_proxy_ajp in a production environment though, so I can't speak to
it's reliability.  I've not had major issues with mod_jk on Linux.

Axton Grams

On Fri, Nov 11, 2011 at 2:19 AM, John Baker
<[email protected]> wrote:
> James
>
> I have no idea why you are installing an Apache front end. it's pointless for 
> almost all deployments of Mid Tier and the mod_jk connector is no longer 
> reliable.
>
> Installing Mid Tier is easy. 1. Unpack Tomcat. 2. Set LD_LIBRARY_PATH to 
> tomcat/webapps/arsys/WEB-INF/lib. 3. Place Mid Tier war file in webapps, 
> called arsys.war. 4. Start Tomcat.
>
>
> John
> --
> SSO Plugin: Bringing BMC products together
> http://www.javasystemsolutions.com/jss/ssoplugin
>
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