Something like this works for the index page:

```
<VirtualHost *:80>
ServerName example.com
Redirect permanent / http://www.example.com
</VirtualHost>

<VirtualHost *:80>
ServerName http://www.example.com
</VirtualHost>

```

So a url like this:

```
http://example.com gets forwarded to 
http://www.example.com

```

but this doesn't work:

```
http://example.com/robots.txt

```

I have also tried the following in .htaccess with the same results:

```
RewriteEngine on
RewriteCond %{HTTP_HOST} ^example\.com
RewriteRule ^(.*)$ http://www.example.com/$1 [R=permanent,L]

```

Please help me resolve this.

Full configuration:

```
LoadModule proxy_module /usr/lib/apache2/modules/mod_proxy.so
LoadModule proxy_http_module /usr/lib/apache2/modules/mod_proxy_http.so
LoadModule proxy_balancer_module /usr/lib/apache2/modules/mod_proxy_balancer.so
LoadModule rewrite_module /usr/lib/apache2/modules/mod_rewrite.so

<VirtualHost *:80>
ServerName example.com
Redirect permanent / http://www.example.com
</VirtualHost>

<VirtualHost *:80>
ServerName http://www.example.com

ProxyPass / balancer://example/ stickysession=JSESSIONID|jsessionid
ProxyPassReverse / balancer://example/ stickysession=JSESSIONID|jsessionid
ProxyPreserveHost On

<Proxy balancer://example>
BalancerMember http://host1.example.com:8080/ route=tomcat1
BalancerMember http://host2.example.com:8080/ route=tomcat2
</Proxy>
</VirtualHost>

```

robots.txt is located on each of the tomcat servers.