mod_perl

Из perldoc Apache:

$c = $r->connection
           The $r->connection method will return a reference to the request
           connection object (blessed into the Apache::Connection package).
           This is really a "conn_rec*" in disguise.  The following methods
           can be used on the connection object:

$c->fileno( [$direction] )
               Returns the client file descriptor. If $direction is 0, the
               input fd is returned. If $direction is not null or ommitted,
               the output fd is returned.
                                                                                                
               This can be used to detect client disconnect without doing any
               I/O, e.g. using IO::Select.

Не подойдет ?

А вообще 
 $r->send_fd( $filehandle ) или 
 $r->internal_redirect("/home/sweet/home.html")