my $errorcount = 0;
my @errors;
for (1..$niterations) {
    my $res = $ua->request($req)
    unless($res->is_success) {
        $errorcount++;
        push(@errors, $res->status_line);
    }
    $errorcount++ unless($res->is_success);
    sleep($sleeptime);
}
die "ERRORS:\n\t" . join("\n\t", @errors) . "\n"
    if($errors > $maxerrors);
exit(0);