Apache Reverse Proxy and Custom Error Documents

[/usr/home]

I currently have a reverse proxy setup in front of multiple web servers. I'm wanting to set custom error pages but am having issues. I am setting the errordocument at the reverse proxy. Is this the correct location top set it or do I set it on the server behind the reverse proxy?

conf on reverse proxy:

<VirtualHost *:80>
#
ServerName files.example.com
#
ProxyPreserveHost On
ProxyRequests On
ProxyPass /error-documents/ !
ProxyPass / http://10.100.100.22/
ProxyPassReverse / http://10.100.100.22/
ProxyErrorOverride Off
RewriteEngine On
ErrorDocument 503 /error-documents/503.html
</VirtualHost>

The html file exists and has appropriate permission on /var/www/error-documents/ on the reverse proxy server.

I'm still getting the default 503 error page though. Any suggestions?

 

[smdion]

This Is what i have for custom error pages

<VirtualHost *:80>
ServerName status.domain.com

ErrorDocument 503 /errors/status503.php
ProxyPass /errors/ !

ProxyPass / http://10.10.10.11:8024/
ProxyPassReverse / http://10.10.10.11:8024/

</VirtualHost>