my $server = IO::Socket::INET->new(...);

while (my $client = $server->accept) {

  if (my $pid = fork()) {
    # parent waits for another connection
    close $client
  }
  elsif (defined $pid) {
    # child handles the request
    while (<$client>) {
      ...
    }
    ...
    close $client;
    close $server;
    exit;
  }
}
close $server;