Using Apache As A Proxy Server - Wheat And Chaff (
Page 4 of 7 )
The ability to have all
HTTP requests directed outside the network going through a single proxy, which
is completely under your control, opens up some interesting possibilities. One
of the most common ones involves using the proxy to filter out and reject
requests for certain "bad" sites. Here's an example, which uses the very
powerful ProxyBlock directive to reject all requests for the Playboy Web site.
ProxyBlock .playboy.com
You can specify multiple sites by separating them with
spaces.
ProxyBlock .playboy.com .badboy.com
You can block all sites in one swell foop with
ProxyBlock *
Obviously, this is kinda pointless, especially after all the
trouble you've gone to to set up the proxy in the first place - but feel free to
try it, if only for the experience.
Any attempt to access one of these
blocked sites will fail, with Apache returning a default error page to the
client. Here's what it looks like:
Obviously, you can customize this page - simply specify
the location of a different error page for all HTTP 403 errors, via the
ErrorDocument directive.
ErrorDocument 403 /error403.html
Here's an example of a custom error page, specified using the
technique above:
/ 22 
