A tracking cookie is any cookie that is shared among two or more web pages for the purpose of tracking a user’s surfing history. Tracking cookies can contain (in text format) the following information:

• The name of the cookie,
• The value of the cookie,
• The expiration date of the cookie,
• The path the cookie is valid for,
• The domain the cookie is valid for,
• The need for a secure connection to exist to use the cookie.

You can also check out RFC2109 (obsolete) and RFC2965 for more information on HTTP State Management Mechanisms

Set-Cookie2 Syntax: The syntax for the Set-Cookie2 response header is

set-cookie	=	"Set-Cookie2:" cookies
cookies	=	1#cookie
cookie	=	NAME "=" VALUE *(";" set-cookie-av)
NAME	=	attr
VALUE	=	value
set-cookie-av		"Comment" "=" value
	|	"CommentURL" "=" <"> http_URL <">
	|	"Discard"
	|	"Domain" "=" value
	|	"Max-Age" "=" value
	|	"Path" "=" value
	|	"Port" [ "=" <"> portlist <"> ]
	|	"Secure"
	|	"Version" "=" 1*DIGIT
portlist	=	1#portnum
portnum	=	1*DIGIT