return join(" ", "touch /dev/shm/${rfn}_spp;",
qw(aria2c --stderr -c -x2 -s10 -j10 -k1M), $url, $additional_mirrors,
$check_certificate ? () : '--check-certificate=false',
return join(" ", "touch /dev/shm/${rfn}_spp;",
qw(aria2c --stderr -c -x2 -s10 -j10 -k1M), $url, $additional_mirrors,
$check_certificate ? () : '--check-certificate=false',