apache, redirecciones y error documents

<VirtualHost *:80>
ServerName web-public.dominio
DocumentRoot /var/www/web_dominio
ServerAdmin admin@dominio.com.ar
  DirectoryIndex index.php
  <Directory "/var/www/web_dominio">
    AllowOverride All
    Options All -Indexes
    Order deny,allow
    allow from all
#
# Error redirect (jony)                
        ErrorDocument 401 /index.php
        ErrorDocument 403 /index.php
        ErrorDocument 404 /index.php
        ErrorDocument 500 /index.php
        ErrorDocument 503 /index.php
        ErrorDocument 504 /index.php
        ErrorDocument 505 /index.php
   </Directory>
</VirtualHost>



Apache redireccionar con proxypass

<VirtualHost *:80>
ProxyRequests On
ProxyVia On
ProxyPreserveHost on
  ServerName webmail.dominio.com.ar
  ProxyPass / http://192.168.1.99/
  ProxyPassReverse / http://192.168.1.99/
</VirtualHost>