[squid-users] Transparent reverse proxy unless origin is not running?

Hi,

Is it possible to use Squid as a reverse proxy so that any requests are
passed through to the origin server (the server serving content) and if
the origin server is not responding serve from the cache?

Is this done using some cache peering? Or is cache peering only for
multiple Squid caches?

Any help would be greatly appreciated.
Cheers, Eb.

-- 
Eric B. Blanchi