Value of Content-Disposition header:

Content-Disposition: attachment; foo="\"\\";filename="foo.html"

Test Description:

'attachment', specifying a filename of foo.html and an extension parameter "foo" which should be ignored (see Section 4.4 of RFC 6266.). In comparison to attwithfilenameandextparam, the extension parameter actually uses backslash-escapes. This tests whether the UA properly skips the parameter.

UA should offer to download the resource as "foo.html".