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wiki.mbirth.de/know-how/development/_posts/2008-07-15-cookies.md

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Domain-Cookies en default 2008-07-15 22:08:02 +0200 2008-07-15 22:08:02 +0200 false
know-how
development
web
cookies

According to various documentation, the cookie domain has to contain at least 2 dots for a browser to accept this as a wildcard cookie (e.g. .google.com) and use this for all sub-domains. So .foo.bar.com should work - should. Opera doesn't like it and only accepts it domain-wide if there are exactly 2 dots in the domain name. In this case .bar.com. If you use .foo.bar.com the string is ignored and the cookie only gets set for the current domain.