By | 15 Jul 2008

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. and use this for all sub-domains. So 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 If you use the string is ignored and the cookie only gets set for the current domain.

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