public static boolean domainMatches (String domain, String host)

The utility method to check whether a host name is in a domain or not.

This concept is described in the cookie specification. To understand the concept, some terminologies need to be defined first:

effective host name = hostname if host name contains dot
                 or = hostname.local if not

Host A's name domain-matches host B's if:

• their host name strings string-compare equal; or
• A is a HDN string and has the form NB, where N is a non-empty name string, B has the form .B', and B' is a HDN string. (So, x.y.com domain-matches .Y.com but not Y.com.)

A host isn't in a domain (RFC 2965 sec. 3.3.2) if:

• The value for the Domain attribute contains no embedded dots, and the value is not .local.
• The effective host name that derives from the request-host does not domain-match the Domain attribute.
• The request-host is a HDN (not IP address) and has the form HD, where D is the value of the Domain attribute, and H is a string that contains one or more dots.

Examples:

• A Set-Cookie2 from request-host y.x.foo.com for Domain=.foo.com would be rejected, because H is y.x and contains a dot.
• A Set-Cookie2 from request-host x.foo.com for Domain=.foo.com would be accepted.
• A Set-Cookie2 with Domain=.com or Domain=.com., will always be rejected, because there is no embedded dot.
• A Set-Cookie2 with Domain=ajax.com will be accepted, and the value for Domain will be taken to be .ajax.com, because a dot gets prepended to the value.
• A Set-Cookie2 from request-host example for Domain=.local will be accepted, because the effective host name for the request- host is example.local, and example.local domain-matches .local.

Parameters:

domain		the domain name to check host name with
host		the host name in question

Returns:  true if they domain-matches; false if not