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Unfortunately one can't take the cookie specs at face value.

Netscape cookies behaviour (the de-facto standard, ie. IE &
Firefox behaviour -- cookie_spec.html is barely worth the
web page it's written on, being flat-out wrong in several
major ways, and very under-specified) has, I'm told, always
simply been simply "split on semicolons".  Certainly that's
what IE and Mozilla do now:

(this is just the text of a CGI for viewing: I didn't make
it executable on reportlab.org)

http://www.reportlab.org/~jjlee/cookie_demo.py

IIRC RFC 2965 is only implemented by Opera, and is certainly
now quite dead as an internet standard.  (though I think it
is useful as a guide for writing cookie-handling code, you
can't follow blindly - not even close :-( )