CGI.pm's man page says:

You can also use named arguments:

print $query->redirect(-uri=>'http://somewhere.else/in/movie/land',
                       -nph=>1);
[download]

The -nph parameter, if set to a true value, will issue the correct headers to work with an NPH (no-parse-header) script. This is important to use with certain servers, such as Microsoft Internet Explorer, which expect all their scripts to be NPH.

What happens if you use -nph => 1?

HTH, Valerio