[Catalyst] post page serving or forking

[apv]

Is there an approved or built-in way to fork something out or
handle it post page serve.

I want to do some referring catching and *sometimes* do a ping
back to prove that the referrer wasn't referrer spam. The ping
back can obviously take up to several seconds.

I'm a little scared to just fork() b/c I don't understand the internals 
of
FastCGI or modperl + Catalyst well enough to know if that's safe.

Thanks!
-Ashley