Value of Content-Disposition header:
Content-Disposition: attachment; filename*=UTF-8''foo-%c3%a4.html; filename="foo-ae.html"
Test Description:
'attachment', specifying a filename of foo-ae.html
in
the traditional format, and foo-ä.html
in RFC2231 format.
Section 4.2 of RFC 5987 and Section 4.3 of RFC 6266 suggest that the RFC 2231/5987 encoded parameter ("filename*") should take precedence when understood.