Parses header and returns a Cookie.
(If header contains multiple cookies, only the first one will be parsed.)
If header does not have "path" or "domain" attributes, they will be defaulted from origin. If origin
is null, path will default to "/", but domain will be left as null. Note that this is not a valid state
for a Cookie, and you will need to fill in some appropriate string for the domain if you want
to actually make use of the cookie.
| header |
a cookie string (eg, the value of a Set-Cookie header) |
| origin |
origin of the cookie, or |
|
a new Cookie, or |