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Note that the default being ISO-8859-1 may not
make sense for all content types, e.g.
...

In the above case you need to pass -charset => ''
to prevent the default being used.

# mycgi.pl
use CGI;
...
open (IMAGE, '<', 'foo.xls');
print <IMAGE>;
close IMAGE;

while true; do { echo -ne "HTTP/1.1 200 OK\r\n"; perl mycgi.pl; } | nc
+ -l -k  8080; done