Description of problem:

"ProxyErrorOverride On" does not work if used with mod_proxy_ajp module.

[ Config Snippet ]

ProxyPass /app/  ajp://127.0.0.1:8009/app/
ProxyErrorOverride On
ErrorDocument 404  /error/404.html

When I access a 404 URL in the /app context, which is proxied with AJP, I get a 404 page from JBoss EAP. Accessing 404 URLs via non-proxied content works as intended, as defined in "ErrorDocument".

Version-Release number of selected component (if applicable):

JBoss EWS 1.0.2 httpd-2.2.17


How reproducible:

Everytime.


Steps to Reproduce:

1. Define "ErrorDocument"
2. Enable "ProxyErrorOverride"
3. Access 404 URL via definied "ProxyPass" context
  

Actual results:

404 error from backend (proxied) server


Expected results:

404 error as defined in "ErrorDocument" via Apache


Additional info:
There is existing [Bug 694939](https://bugzilla.redhat.com/show_bug.cgi?id=694939) with Apache httpd provided with RHEL6, which got fixed in Apache httpd rpm provided with RHEL 6.2