First: What's wrong with using backticks in a void context?

Then you should probably do it like this:

for my $i ( 0 .. $#array1 ) {
    0 == system 'curl', '-G', '-x', "$array1[$i]:$array2[$i]", 'http:/
+/www.google.com'
        or die "system 'curl' failed: $?";
}
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