Shell escapes are weak sauce, use system, use Capture::Tiny 
use Capture::Tiny qw/ capture /;
my($stdout, $stderr, $exit) = capture {
    system '.../curl', ...',"\r\n\r\n...";
};;

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In reply to Re^3: An optimal way to induce CRLF using perlio by Anonymous Monk
in thread An optimal way to induce CRLF using perlio by perlron

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