Value of Content-Disposition header:
Content-Disposition: attachment; filename=foo[1](2).html
Test Description:
'attachment', specifying a filename of foo[1](2).html
, but missing
the quotes. Also, "[", "]", "(" and ")" are not allowed in the HTTP token
production.
This is invalid according to Section 19.5.1 of RFC 2616 and RFC 6266, so UAs should ignore it.