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.