Value of Content-Disposition header:
Content-Disposition: attachment; filename="foo-ä.html"
Test Description:
'attachment', specifying a filename of foo-ä.html
,
which happens to be foo-ä.html
using UTF-8 encoding.
UA should offer to download the resource as "foo-ä.html". Displaying "foo-ä.html" instead indicates that the UA tried to be smart by detecting something that happens to look like UTF-8.