Apache2::Request handling errors

Hi there,

I am using Apache2::Request with a POST_MAX setting as in the pod:

my $req = Apache::Request->new($r, POST_MAX => "1M");

What I am trying to work out is which is considered the
best/recommended way to catch and handle the error that occurs if
someone tries to upload anything larger than this. This is probably
documented somewhere so pointers to the right place in the FM would be
gratefully received.

Thanks in advance,

Stephen Quinney