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  1. or download this
    use strict;
use warnings FATAL => qw#all#;
...
#print qq#content-type: text/plain; charset=UTF-8\n\n#;

print q#print: ϗblah頁#; # wide char error.
  2. or download this
    use strict;
use warnings FATAL => qw#all#;
...

warn q#warn: ϗblah頁#; # no error.
print q#print: ϗblah頁#; # wide char error still.