If it's not, you can do something like adding the following to your form: 
qq{<input type="hidden" name="shibboleth" value="\x{E9}">}

[download]

If you get %E9, you got iso-latin-1 as desired.
If you get %C3%A9, you got UTF-8 instead.

In reply to Re^7: WWW::Mechanize always use utf8 by ikegami
in thread WWW::Mechanize always use utf8 by Anonymous Monk

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