First, 

my $curlResult = `echo $?`;
chomp($curlResult);

[download]
is the same thing as 
my $curlResult = $?;

[download]

Second, $? doesn't contain the exit code. Well, not just the exit code. See its documentation.

In reply to Re^5: Parallel::ForkManager run_on_finish Canot get Exit Code of Child process by ikegami
in thread Parallel::ForkManager run_on_finish Canot get Exit Code of Child process by anshumangoyal

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