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               ---------                  -----------------
              |         |   form data    |                  |
    ...
              |         | <------------- | stderr           |
              |         |                |                  |
               ---------                  -----------------
    
  2. or download this
               ---------                  -----------------
              |         |   form data    |                  |
    ...
              |         | <----------------- |                 |
               ---------                  ---|                 |
                                              -----------------
    
  3. or download this
    my $pid = fork;
    die "fork failed: $!" unless defined($pid);
    ...
        exec $program, @args;
        die "exec failed";
    }